Item 1. Business
ITEM
1. BUSINESS
BUSINESS
Overview
of the Company
BriaCell
(the “ Company ”) is an immuno-oncology biotechnology company with a strong focus on cancer immunotherapy.
Immunotherapies have come to the forefront in the fight against cancer since they harness the body’s own immune system to recognize
and destroy cancer cells. BriaCell owns the U.S. patent to SV-BR-1-GM (“ Bria-IMT™ ”), a whole-cell targeted immunotherapy
for cancer (U.S. Patent No. 7,674,456), as well as patents related to PKCδ inhibitors (U.S. Patent Nos. 9,364,460 and 9,572,793).
The Company is currently advancing our targeted immunotherapy program by prioritizing a Phase I/IIa clinical trial with Bria-IMT™
in combination with an immune checkpoint inhibitor and a companion diagnostic test, BriaDx™, to identify patients most likely to
benefit from Bria-IMT™. The Bria-IMT™ regimen was evaluated in four patients in a prior study in 2004-2006 by Dr. Charles
Wiseman, the scientific founder, former member of the board of directors of the Company (the “ Board ”) and principal
scientific advisor. Encouraging results were obtained, especially in a patient who matched Bria-IMT™ at HLA-DR alleles and had
a grade II tumor. In 2017-2018 BriaCell evaluated 23 patients with advanced breast cancer with the Bria-IMT™ regimen and obtained
confirmation of the ability of the Bria-IMT™ regimen to induce regression of metastatic breast cancer in patients who match Bria-IMT™
at least at one HLA allele and/or if they had grade I or grade II tumors. A combination study with the immune checkpoint inhibitor pembrolizumab
(KEYTRUDA®) was initiated and the first patient dosing in the “combination therapy” clinical trial occurred in September
2018. BriaCell purchased the KEYTRUDA® for this study as BriaCell does not have an agreement with Merck & Co., Inc. for the supply
of KEYTRUDA®. Eleven patients were dosed in the combination therapy trial with Bria-IMT™ and the immune checkpoint inhibitor
KEYTRUDA® and subsequently dosing with this combination was discontinued. The study was modified under an amended protocol which
evaluates the combination of the Bria-IMT™ regimen with Incyte Corporation experimental drugs retifanlimab (anti-PD-1 antibody
similar to pembrolizumab). The study is ongoing.
Market
It
is estimated by the National Cancer Institute that in 2022, approximately 287,500 women will be diagnosed with breast cancer in the United
States. That means that every two minutes an American woman is diagnosed with breast cancer and more than 43,000 are projected to die
in 2022. Although about 100 times less common than in women, breast cancer also affects men. It is estimated that the lifetime risk of
men getting breast cancer is about 1 in 1,000, and the American Cancer Society estimates that approximately 2,710 new cases of invasive
male breast cancer will be diagnosed and approximately 530 men will die from breast cancer in 2022.
According
to the May 2019 “Global Oncology Trends 2021” report by the IQVIA Institute, the global market for cancer drugs (including
immunotherapy drugs) is expected to reach nearly $269 billion by the end of 2025, growing at a compound annual growth rate (“ CAGR ”)
of 10% between 2021 and 2025, of which about 20% is expected to be immuno-oncology drugs.
5
About 12.9% percent of women will be diagnosed
with breast cancer at some point during their lifetime. In 2018, there were an estimated 3,676,262 women living with female breast cancer
in the United States. Approximately 81% of cases present as invasive breast cancer. Approximately 6% of new breast cancer diagnoses are
Stage IV (metastatic breast cancer (“ MBC ”), which has already spread to other organs). Twenty to thirty percent of
all women diagnosed with breast cancer will develop MBC. Breast cancer can be subdivided based on receptor status – the hormone
receptors for estrogen (ER) and progesterone (PR), collectively referred to as hormone receptors (HR), and the Her2/neu growth factor
receptor (HER2). Based on the latest SEER statistics, 74.6% were found to be HR+/HER2−, 10.8% were triple-negative (HR−/HER2−),
10.5% were HR+/HER2+, and 4.0% were HR−/HER2+. 1
It
is estimated that over 150,000 women in the US are living with MBC. 2 For those with metastatic disease at diagnosis, their
5-year survival rate is 27%. 3 For patients who develop MBC after initially having localized disease, if they had a good response
to treatment (i.e. a disease-free interval of more than 24 months), their survival rate is similar to that of patients with MBC at initial
diagnosis, but if their disease-free interval is less than 24 months, their prognosis is worse. 4 We currently propose that
Bria-IMT’s™ indication will be for the treatment of patients with MBC who have failed at least two lines of therapy. Similarly,
another study showed that the median overall survival among patients with de novo stage IV MBC was 39.2 months, while for patients with
relapsed disease it was 27.2 months. 5 Median progression free survival after first-line therapy is only 9 months and the survival
benefit decreases with subsequent lines of therapy. 6 One study showed that of 386 patients with MBC, 374 (97%) received first-line
therapy, 254 (66%) received second-line therapy, 175 (45%) received third-line therapy, and 105 (27%) received therapy beyond third-line. 7
1
See https://seer.cancer.gov/statfacts/html/breast.html
2
Mariotto AB, Etzioni R, Hurlbert M, Penberthy L, Mayer M. Estimation of the Number of Women Living with Metastatic Breast Cancer
in the United States. Cancer Epidemiol Biomarkers Prev. 2017 Jun;26(6):809-815.
3
Breast Cancer Facts & Figures 2017-2018. Atlanta: American Cancer Society, Inc. 2017.
4
Lobbezoo, D. J. A. et al. Prognosis of metastatic breast cancer subtypes: the hormone receptor/HER2-positive subtype is associated
with the most favorable outcome. Breast Cancer Res. Treat. 141, 507–514 (2013).
5
Dawood S, Broglio K, Ensor J, Hortobagyi GN, Giordano SH. Survival differences among women with de novo stage IV and relapsed breast
cancer. Ann Oncol. 2010 Nov; 21(11):2169–74.
6
Bonotto M, Gerratana L, Iacono D, Minisini AM, Rihawi K, Fasola G, Puglisi F. Treatment of Metastatic Breast Cancer in a Real-World
Scenario: Is Progression-Free Survival With First Line Predictive of Benefit From Second and Later Lines? Oncologist.
7
Kotsakis A, Ardavanis A, Koumakis G, Samantas E, Psyrri A, Papadimitriou C. Epidemiological characteristics, clinical outcomes
and management patterns of metastatic breast cancer patients in routine clinical care settings of Greece: Results
6
Figure
A: Overview of current drugs for breast cancer, demonstrating the pattern of novel therapeutic introductions and significant market
uptake. These precedents demonstrate a strong market pull for Bria-IMT™.
Drug
Technology
Company
Indication
2018 Sales US
(Mil $US)
2018 Sales Ex-US
(Mil $US)
2018 Sales WW
(Mil $US)
HERCEPTIN® (trastuzumab)
Monoclonal antibody
Roche
HER2+BC & HER2+ metastatic gastric cancer
2,955
4,140
7,096
IBRANCE® (palbociclib) in combination with fluvestrant or aromatase inhibitor
CDK 4/6 inhibitor
Pfizer
HR+/HER2- MBC
2,922
1,196
4,118
PERJETA® (pertuzumab) in combination with Herceptin® (trastuzumab) and chemotherapy
HER2/neu receptor antagonist
Roche
HER2+ early BC that has a high likelihood of recurrence
1,347
1,499
2,846
FASLODEX® (fulvestrant)
Estrogen receptor antagonist
AstraZeneca
HR+/HER2- MBC
537
491
1,028
KADCYLA® (ado-trastuzumab emtansine)
HER2 targeted antibody & microtubule inhibitor conjugate
Roche
HER2+BC
365
630
995
LYNPARZA® (olaparib)
Poly (ADP-ribose) polymerase (PARP) inhibitor
AstraZeneca
BC & Ovarian cancer
345
302
647
Verzenio® (abemaciclib) monotherapy or in combination with fulvestrant or aromatase inhibitor
CDK 4/6 inhibitor
Eli Lilly
HR+/HER2- MBC
255
-
255
KISQALI® (ribociclib) in combination with fluvestrant or aromatase inhibitor
CDK 4/6 inhibitor
Novartis
HR+/HER2- MBC
235
-
235
The
best response to Bria-IMT™ to date is in patients who matched Bria-IMT™ at one or more HLA alleles, with higher response
rates for patients with 2+ HLA allele matches. If one HLA allele match is found to be sufficient, we will be able to treat ~50-60% of
the patient population, while patients with 2+ HLA matches constitutes ~15-35% of cases. 8 We also saw higher clinical benefit
rates for patients with grade I/II tumors. Tumor differentiation in breast cancer cell lines is often described by their classification
as Luminal, Basal A and Basal B subtypes, with Luminal representing well differentiated tumors, Basal B poorly differentiated tumors,
and Basal A an intermediate stage tumor (“moderately” differentiated). 2
Yao and colleagues in 2005 identified a 9-gene signature (AURKB, CENPI, DEPDC1, DEPDC1B, FAM83D, FGD3, NCAPH, TNFRSF18, FCGR1A)
discriminating poorly (grade 3) from moderately (grade 2) differentiated tumors. 3
To understand the place of SV-BR-1-GM in this model, we compared its RNA expression profile with those of three other cell lines
representing Luminal (MCF-7), Basal A (MDA-MB-468) and Basal B (MDA-MB-231), using a 10-gene signature (AURKB, CENPI, DEPDC1, DEPDC1B,
FAM83D, FGD3, NCAPH, DLGAP, KIF2C, VAV3) derived from those by Yao and colleagues. The results, shown in the figure below, demonstrate
that Bria-IMT™ most closely clusters with MDA-MB-468 and as such is considered a grade II “moderately differentiated”
cell line.
Greece:
Results from the EMERGE multicenter retrospective chart review study. BMC Cancer. 2019 Jan 18;19(1):88.
8
Gragert, Loren, Abeer Madbouly, John Freeman, and Martin Maiers. 2013. “Six-Locus High Resolution HLA Haplotype Frequencies
Derived from Mixed-Resolution DNA Typing for the Entire US Donor Registry.” Human Immunology.
2
Neve RM, Chin K, Fridlyand J, et al. A collection of breast cancer cell lines for the study of functionally distinct
cancer subtypes. Cancer Cell. 2006;10(6):515-527. doi:10.1016/j.ccr.2006.10.008)
3
Yao F, Zhang C, Du W, Liu C, Xu Y. Identification of gene-expression signatures and protein markers for breast cancer
grading and staging. PLoS One. 2015;10(9). doi:10.1371/journal.pone.0138213)
7
Based
on a recent publication of patients with relapsed breast cancer, we estimate that this will account for ~40% of relapsed metastatic breast
cancer cases (33% grade II and 7% grade I) (Sundquist M, Brudin L, Tejler G. Improved survival in metastatic breast cancer 1985-2016.
Breast. 2017 Feb;31:46-50. doi: 10.1016/j.breast.2016.10.005. Epub 2016 Nov 2). In patients with relapsed disease, the overall survival
following relapse appears similar for those with grade II and grade III tumors. 9 The market for breast cancer drugs is a multibillion-dollar
market with new drugs being approved on an ongoing basis, indicating the shortage of safe and effective treatments for this deadly disease.
Figure A summarizes current drugs on the market utilized in combination therapy along with their reported market sales, which further
supports market potential for Bria-IMT™ to be used for combination therapy for breast cancer patients.
We
propose the following calculation in order to show the rationale behind the number of patients that we anticipate can be currently treated
by SV-BR-1-GM:
●
There are 150,000 women with
metastatic breast cancer in the U.S. 10
●
~45% will receive third line
therapy 11 = 68,000 patients available
●
68,000 x 50% (matched for 1
HLA allele group) 12 = 34,000 patients available for treatment 13
●
40% have grade I/II tumors 14
= 13,600 patients available for treatment
9
See note 5, above.
10
Mariotto AB, Etzioni R, Hurlbert M, Penberthy L, Mayer M. Estimation of the Number of Women Living with Metastatic Breast Cancer
in the United States. Cancer Epidemiol Biomarkers Prev. 2017 Jun;26(6):809-815.
11
Kotsakis A, Ardavanis A, Koumakis G, Samantas E, Psyrri A, Papadimitriou C. Epidemiological characteristics, clinical outcomes
and management patterns of metastatic breast cancer patients in routine clinical care settings of Greece: Results from the EMERGE multicenter
retrospective chart review study. BMC Cancer. 2019 Jan 18;19(1):88.
12
Gragert, Loren, Abeer Madbouly, John Freeman, and Martin Maiers. 2013. “Six-Locus High Resolution HLA Haplotype Frequencies
Derived from Mixed-Resolution DNA Typing for the Entire US Donor Registry.” Human Immunology.
13
Momenimovahed Z, Salehiniya H. Epidemiological characteristics of and risk factors for breast cancer in the world. Breast Cancer
(Dove Med Press). 2019 Apr 10;11:151-164. SEER Cancer Statistics Factsheets: Female Breast Cancer. National Cancer Institute. Bethesda,
MD; American Cancer Society. Breast Cancer Facts & Figures 2017-2018. Atlanta: American Cancer Society, Inc. 2017.
14
See note 5, above.
8
Competition
Currently
available therapeutic options for breast cancer offer some hope for patients, but there is much room for improvement. Comparable studies
looking primarily at second line or later treatment are shown in Table “A”, below. Evaluating response rates (partial and
complete responses = ORR), progression free survival (“ PFS ”) and overall survival (“ OS ”) from clinical
trials in similar subjects with metastatic or recurrent breast cancer indicate that response rates range from 6.9% up to 59%, depending
on the population studied and the intervention (median 24%). PFS ranges from 8 weeks to 12 months (median 5 months) and OS from 6 months
to 31 months (median 13 months).
Table
A: Studies evaluating second-line or later treatment options. Data depict an unpredictable response rate to treatment ranging from
6.9-59%, therefore establishing and confirming the opportunity for Bria-IMT™.
Study
Treatment & Design
# of Pts
ORR
PFS/TTP
OS
Perez 15
Paclitaxel Monotherapy
212
21.5 %
4.7 mo
12.8 mo
Seidman 16
Gemcitabine Monotherapy
160
26 %
Zelek 17
Vinorelbine Monotherapy
40
25 %
6 mo
Licchetta 18
Cyclophosphamide and megestrol acetate
29
31 %
7.4 mo
13.4 mo
Harvey 19
Docetaxel Monotherapy 60 mg/m2
122
22.1 %
12.7 wk
10.6 mo
Docetaxel Monotherapy 75 mg/m2
146
23.3 %
15.0 wk
10.3 mo
Docetaxel Monotherapy 100 mg/m2
139
36.0 %
16.6 wk
12.3 mo
Rivera 20
Docetaxel Monotherapy q3wk
59
35.6 %
5.7 mo
18.3 mo
Docetaxel Monotherapy qwk
59
20.3 %
5.5 mo
18.6 mo
Gradishar 21
ABI-007 (Nab paclitaxel)
229
33 %
23.0 wk
65.0 wk
Paclitaxel Monotherapy
225
19 %
16.9 wk
55.7 wk
ABI-007 (Nab paclitaxel) 2nd line
132
27 %
20.9 wk
56.4 wk
Paclitaxel Monotherapy 2nd line
136
13 %
16.1 wk
46.7 wk
Perez 22
Ixabepilone Monotherapy
126
11.5 %
3.1 mo
8.6 mo
Leyland-Jones 23
Trastuzumab with paclitaxel
32
59 %
12.2 mo
von Minckwitz 24
Trastuzumab with capecitabine
78
48.1 %
8.2 mo
25.5 mo
Capecitabine Monotherapy
78
27.0 %
5.6 mo
20.4 mo
Verma 25
Trastuzumab emtansine
495
43.6 %
9.6 mo
30.9 mo
lapatinib plus capecitabine
496
30.8 %
6.4 mo
25.1 mo
Geyer 26
Lapatinib plus capecitabine
163
22 %
8.4 mo
Capecitabine Monotherapy
161
14 %
4.4 mo
Bartsch 27
Capecitabine and trastuzumab
40
20 %
8 mo
24 mo
Blackwell 28
Lapatinib Monotherapy
148
6.9 %
8.1 wk
39.0 wk
Lapatinib with trastuzumab
148
10.3 %
12.0 wk
51.6 wk
MBC
treated with second or higher lines of therapy has a very poor prognosis and few effective therapies that consistently induce long-term
remission, 29 which indicates the market demand and clinical need for new and improved therapeutic drugs and treatment options
in order to improve these response outcomes and patient survival rates. Thus, Bria-IMT™ has the potential to induce long-term remission,
especially in combination with immunotherapies. Current treatment of MBC is outlined in Figure “B”, below, which illustrates
different therapeutic treatment options and drugs used upon diagnoses from biopsy and identification of breast cancer biomarkers. 30
15
Perez, E. A., Vogel, C. L., Irwin, D. H., Kirshner, J. J. & Patel, R. Multicenter Phase II Trial of Weekly Paclitaxel in Women
With Metastatic Breast Cancer. J. Clin. Oncol. 19, 4216–4223 (2001).
16
Seidman, A. D. Gemcitabine as single-agent therapy in the management of advanced breast cancer. Oncology (Williston Park). 15,
11–4 (2001).
17
Zelek, L. et al. Weekly vinorelbine is an effective palliative regimen after failure with anthracyclines and taxanes in metastatic
breast carcinoma. Cancer 92, 2267–72 (2001).
18
Licchetta A, Correale P, Migali C, Remondo C, Francini E, Pascucci A, Magliocca A, Guarnieri A, Savelli V, Piccolomini A, Carli
AF, Francini G. Oral metronomic chemo-hormonal-therapy of metastatic breast cancer with cyclophosphamide and megestrol acetate. J Chemother.
2010 Jun;22(3):201-4.
19
Harvey, V. et al. Phase III Trial Comparing Three Doses of Docetaxel for Second-Line Treatment of Advanced Breast Cancer. J. Clin.
Oncol. 24, 4963–4970 (2006).
20
Rivera, E. et al. Phase 3 study comparing the use of docetaxel on an every-3-week versus weekly schedule in the treatment of metastatic
breast cancer. Cancer 112, 1455–1461 (2008).
21
Gradishar WJ. Taxanes for the treatment of metastatic breast cancer. Breast Cancer (Auckl). 2012;6:159-71.
22
Perez, E. A. et al. Efficacy and Safety of Ixabepilone (BMS-247550) in a Phase II Study of Patients With Advanced Breast Cancer
Resistant to an Anthracycline, a Taxane, and Capecitabine. J. Clin. Oncol. 25, 3407–3414 (2007).
23
Leyland-Jones, B. et al. Pharmacokinetics, Safety, and Efficacy of Trastuzumab Administered Every Three Weeks in Combination With
Paclitaxel. J. Clin. Oncol. 21, 3965–3971 (2003). Only 41% of patients had prior systemic chemotherapy.
24
von Minckwitz G et el. Trastuzumab beyond progression: overall survival analysis of the GBG 26/BIG 3-05 phase III study in HER2-positive
breast cancer. Eur J Cancer. 2011 Oct;47(15):2273-81. Prior therapy limited to trastuzamab alone or in combination with a taxane.
25
Verma, S. et al. Trastuzumab Emtansine for HER2-Positive Advanced Breast Cancer. N. Engl. J. Med. 367, 1783–1791 (2012).
26
Geyer, C. E. et al. Lapatinib plus Capecitabine for HER2-Positive Advanced Breast Cancer. N. Engl. J. Med. 355, 2733–2743
(2006).
27
Bartsch, R. et al. Capecitabine and Trastuzumab in Heavily Pretreated Metastatic Breast Cancer. J. Clin. Oncol. 25, 3853–3858
(2007).
28
Blackwell, K. L. et al. Randomized Study of Lapatinib Alone or in Combination With Trastuzumab in Women With ErbB2-Positive, Trastuzumab-Refractory
Metastatic Breast Cancer. J. Clin. Oncol. 28, 1124–1130 (2010).
29
Dawood S, Broglio K, Ensor J, Hortobagyi GN, Giordano SH. Survival differences among women with de novo stage IV and relapsed breast
cancer. Ann Oncol. 2010 Nov; 21(11):2169–74; Bonotto M, Gerratana L, Iacono D, Minisini AM, Rihawi K, Fasola G, Puglisi F. Treatment
of Metastatic Breast Cancer in a Real-World Scenario: Is Progression-Free Survival With First Line Predictive of Benefit From Second
and Later Lines? Oncologist. 2015 Jul;20(7):719-24; Kotsakis A, Ardavanis A, Koumakis G, Samantas E, Psyrri A, Papadimitriou C. Epidemiological
characteristics, clinical outcomes and management patterns of metastatic breast cancer patients in routine clinical care settings of
Greece: Results from the EMERGE multicenter retrospective chart review study. BMC Cancer. 2019 Jan 18;19(1):88.
30
NCCN Guidelines Version 2.2019, 07/02/2019 © 2019 National Comprehensive Cancer Network (NCCN®).
9
Figure
B: Current treatment paradigm for metastatic breast cancer including between different treatment strategies and combination therapies
dependent upon biomarker identification and activity within the breast cancer signaling pathway.
Of
patients treated with trastuzumab for MBC, one study showed that 241/331 (72%) progressed within 27 months (32% per year) with median
survival of 13-14 months (CI 10-15 months). 31 This indicates the high unmet need in this patient population which should facilitate
regulatory review of novel therapies such as Bria-IMT™.
While
there are approximately 36 different biotech companies working to create an effective breast cancer vaccine, a significant gap remains
in the effectiveness and safety of second or higher lines of therapy. The most studied targeted immunotherapy, Neuvax (Galena), a HER2
peptide vaccine, failed a Phase III trial, but there is encouraging data to support at least three ongoing clinical trials combining
trastuzumab with HER2 epitope immunogens. 32 The National Cancer Institute (“ NCI ”) randomized trial adding
PANVAC (a poxviral-based immunogen) to docetaxel increased the median PFS from 3.9 months to 7.9 months and is to be used as a basis
for larger, more sophisticated clinical trials. 33 An immunogen targeting a carbohydrate antigen, globo-H, was associated with
improved PFS, but only in the subset able to mount antibody responses. 34 A Johns Hopkins breast cancer trial using a breast
cancer cell line transfected with the gene for GM-CSF has not been positive but, using the same cell line with trastuzumab, 40% of patients
enjoyed clinical benefit (CR+PR+stable) at one year. 35 Finally, the study of targeted cancer immunotherapies in combination
with other therapies is receiving much attention, particularly combination with checkpoint inhibitors. 36
31
Rossi, V.; Nole, F.; Redana, S.; Adamoli, L.; Martinello, R.; Aurilio, G.; Verri, E.; Sapino, A.; Viale, G.; Aglietta, M.; Montemurro,
F., Clinical outcome in women with HER2-positive de novo or recurring stage IV breast cancer receiving trastuzumab-based therapy. Breast
2014, 23 (1), 44-9.
32
Mittendorf, E. A.; Peoples, G. E., Injecting Hope—A Review of Breast Cancer Vaccines. Oncology (Williston Park) 2016, 30
(5), 475-81, 485.
33
Heery, C. R.; Ibrahim, N. K.; Arlen, P. M.; Mohebtash, M.; Murray, J. L.; Koenig, K.; Madan, R. A.; McMahon, S.; Marte, J. L.;
Steinberg, S. M.; Donahue, R. N.; Grenga, I.; Jochems, C.; Farsaci, B.; Folio, L. R.; Schlom, J.; Gulley, J. L., Docetaxel Alone or in
Combination With a Therapeutic Cancer Vaccine (PANVAC) in Patients With Metastatic Breast Cancer: A Randomized Clinical Trial. JAMA Oncol
2015, 1 (8), 1087-95.
34
Huang, C.; Yu, A.; Tseng, L., Randomized phase II/III trial of active immunotherapy with OPT-822/OPT-821 in patients with metastatic
breast cancer. J Clin Oncol 2016, 34 (15).
35
Chen, G.; Gupta, R.; Petrik, S.; Laiko, M.; Leatherman, J. M.; Asquith, J. M.; Daphtary, M. M.; Garrett-Mayer, E.; Davidson, N.
E.; Hirt, K.; Berg, M.; Uram, J. N.; Dauses, T.; Fetting, J.; Duus, E. M.; Atay-Rosenthal, S.; Ye, X.; Wolff, A. C.; Stearns, V.; Jaffee,
E. M.; Emens, L. A., A feasibility study of cyclophosphamide, trastuzumab, and an allogeneic GM-CSF-secreting breast tumor vaccine for
HER2+ metastatic breast cancer. Cancer Immunol Res 2014, 2 (10), 949-61.
36
McArthur, H. L.; Page, D. B., Immunotherapy for the treatment of breast cancer: checkpoint blockade, cancer vaccines, and future
directions in combination immunotherapy. Clin Adv Hematol Oncol 2016, 14 (11), 922-933.
10
There
are several other approaches to developing targeted breast cancer immunotherapies. These include using peptide cocktails, a triple peptide
regimen, recombinant HER2, antigen-pulsed dendritic cells, DNA immunogens, whole cell allogeneic GM-CSF secreting SKBR3 or T47D cells,
an (HLA)-A2/A3-restricted immunogenic peptide derived from the HER2 protein, oxidized mannan-MUC1, and personalized peptide immunogens.
Among
the most promising results in patients with advanced disease have been using whole-cell preparations, particularly if the cells are engineered
to express GM-CSF. We are taking this approach and capitalizing on positive initial results with Bria-IMT™ monotherapy in difficult
to treat patients using a regimen that both limits regulatory T cell activity (using low dose cyclophosphamide pre-treatment) and boosts
the immune response (using post-dose alpha interferon in the inoculation sites). The combination with PD-1 inhibitors is a logical extension
of our findings where 21 of 23 MBC patients had demonstrable PD-L1 expression on the circulating tumor cells (“ CTCs ”)
and/or circulating cancer-associated macrophage-like cells (“ CAMLs ”). The overall strategy, once the initial milestones
have been met, to enroll additional patients for product registration, will allow rapid progression of the best therapeutic option to
a Biologics License Application (“ BLA ”).
Products/Pipeline
Bria-IMT™
Bria-IMT™,
BriaCell’s lead candidate, is a whole-cell immunotherapy undergoing clinical testing in patients with MBC who have failed prior
lines of therapy. BriaCell has been conducting a Phase I/IIa clinical trial of Bria-IMT™, in combination with immune checkpoint
inhibitors such as pembrolizumab (KEYTRUDA®; manufactured by Merck & Co., Inc.). The combination study is listed in ClinicalTrials.gov
as NCT03328026 under FDA-approved BB-IND 10312 under protocol BRI-ROL-001 at three clinical sites: St. Joseph Heritage Healthcare in
Santa Rosa, California, United States; University of Miami/Sylvester at Plantation, in Plantation, Florida, USA; Cancer Center of Kansas,
in Wichita, Kansas, USA. Subsequent to the establishment of a collaboration with Incyte Corporation, this study has been modified to
evaluate the combination of the Bria-IMT™ with retifanlimab (also referred to as INCMGA00012 ,a PD-1 inhibitor).
BriaCell
has achieved proof of concept based on data from a Phase I/IIa study of Bria-IMT™ in advanced breast cancer patients. In essence,
BriaCell obtained evidence that patients with certain HLA molecules also present in Bria-IMT™ have a higher likelihood of responding
to the Bria-IMT™ regimen with tumor regression (“ shrinkage ”), which is consistent with results from a molecular
analysis of Bria-IMT™ conducted by BriaCell.
Positive
Proof of Concept
●
Bria-IMT™
has been evaluated in a regimen including pre-dose low-dose cyclophosphamide (to reduce immune suppression), intradermal inoculation
with 20-50 million irradiated Bria-IMT™ cells between two and three days later, with subsequent intradermal inoculation with
interferon-α2 approximately two and four days later. This is known as the Bria-IMT™ regimen. Both were single arm studies,
so there were no untreated patients for comparison.
●
BriaCell
has evaluated the Bria-IMT™ regimen in two Phase I/IIa studies of Bria-IMT™ in advanced breast cancer patients.
X.;
Wolff, A. C.; Stearns, V.; Jaffee, E. M.; Emens, L. A., A feasibility study of cyclophosphamide, trastuzumab, and an allogeneic GM-CSF-secreting
breast tumor vaccine for HER2+ metastatic breast cancer. Cancer Immunol Res 2014, 2 (10), 949-61.
11
●
There
were four evaluable patients treated in one study (Study SVMC #01-026) and 23 evaluable patients treated in another study (Study
WRI-GEV-007) with this regimen with cycles every two weeks for the first month and then monthly. They were heavily pre-treated with
a median of four prior systemic therapy regimens.
●
The data
shows an outstanding safety and tolerability profile for Bria-IMT™ in advanced breast cancer patients.
●
In the
SVMC #01-026 study, treatment was limited to six cycles over five months. Four post-menopausal white women were enrolled aged between
58.7 and 73 years. Three had breast cancer and one had Her2+ ovarian cancer. All had failed at least one prior systemic therapy.
●
These
patients received between four and six cycles of treatment on protocol. One patient had an additional 13 cycles off protocol.
●
The
only adverse events that occurred in more than one patient were itch and rash at the inoculation sites. No deaths were reported during
this study. There were four serious adverse events (“ SAEs ”) in 3 patients with one (transient urticaria, grade
3) judged probably related to treatment. All SAEs were manageable with community practice therapies.
●
The
Bria-IMT™ regimen was able to elicit delayed-type hypersensitivity (“ DTH ”) responses in all patients. DTH
is a measure of cell-mediated immunity. This response involves the interaction of T-cells, monocytes, and macrophages. This reaction
is caused when CD4+ Th1 helper T cells recognize foreign antigen in a complex with the Class II HLA molecule on the surface of antigen-presenting
cells. These can be macrophages or dendritic cells that secrete monokines such as IL-12 and IL-15, which stimulates the proliferation
of additional CD4+ Th1 cells. CD4+ T cells secrete other cytokines including IL-2 and interferon gamma, inducing the further release
of other Th1 cytokines, thus mediating the immune response. This results also in the activation of CD8+ T cells which destroy target
cells on contact, and activated macrophages which produce hydrolytic enzymes.
●
The
DTH response involves the interaction of T-cells, monocytes, and macrophages. This reaction is caused when CD4+ Th1 helper T cells
recognize foreign antigen in a complex with the Class II HLA molecule on the surface of antigen-presenting cells. These can be macrophages
or dendritic cells that secrete monokines such as IL-12 and IL-15, which stimulates the proliferation of additional CD4+ Th1 cells.
CD4+ T cells secrete other cytokines including IL-2 and interferon gamma, inducing the further release of other Th1 cytokines, thus
mediating the immune response. This results also in the activation of CD8+ T cells which destroy target cells on contact and activated
macrophages which produce hydrolytic enzymes.
12
●
One
patient (A002) had a partial response with regression of breast lesions, resolution of lung and soft tissue lesions, and improvement
of stability of bone lesions. She completed therapy and 3 months after her last Bria-IMT™ inoculation, imaging studies identified
regrowth of tumor notably in the breast, lung, and brain. After consultation with the FDA, the patient was treated off-protocol which
also produced tumor regression, including the resolution of brain metastases. The HLA-DRB3 allele of patient A002 matched with that
of SV-BR-1-GM and the HLA-DRB1 allele of patient A002 also matched that of SV-BR-1-GM. Her tumor was grade II (moderately differentiated).
One other patient on this study (B001) with a grade II tumor had disease limited to bony metastases. She did not have measurable
disease but was felt to progress on study.
●
Median
time to tumor progression was 144 days (range 64 – 223 days) for the initial round of treatment. Overall survival was more
than 33 months in all patients except B001 (7 months).
●
In the
WRI-GEV-007 study, patients were treated with a median of three cycles of therapy (range 1-8).
●
The
Bria-IMT™ regimen was able to elicit both cellular immune responses (as evidenced by DTH responses in 85% of patients evaluated)
and antibody responses (present in 58% of patients evaluated).
●
The
most common adverse events seen were local irritation at the inoculation sites. There was one serious adverse event of gastrointestinal
reflux disease possibly related to Bria-IMT™.
●
Several
patients showed evidence of anti-tumor activity of the Bria-IMT™ regimen in spite of their being heavily pre-treated advanced
breast cancer patients. Specifically, one patient (designated 01-002) had regression or disappearance of 20 lung metastases, but
stable disease in liver metastases (as the liver metastases were the target lesions, she did not qualify as a partial response).
She displayed a robust DTH response, had a grade I tumor and matched Bria-IMT™ at 2 HLA loci. One patient (05-002) had a reduction
in the size of a breast lesion but progression of a liver lesion and did not meet criteria for a partial response. She also displayed
a robust DTH response, had a grade II tumor and matched Bria-IMT™ at 2 HLA loci. One patient (01-005) had a marked reduction
in cutaneous involvement but developed restrictive cardiomyopathy (unrelated to study drug) with subsequent mortality. She had a
grade III (poorly differentiated) tumor and matched Bria-IMT™ at one HLA locus. She was not on study long enough to be evaluated
for her response.
●
Patients
01-002, 05-002 and 01-005 who showed objective evidence of tumor shrinkage all matched the Bria-IMT™ cell line at least at
one HLA locus and all had evidence of DTH responses to Bria-IMT™ and/or the parent cell line (SV-BR-1 – the breast cancer
cell line from which Bria-IMT™ was derived). Patients who did not develop a DTH response did not show evidence of tumor shrinkage.
●
Patients
01-002 and 05-002 had grade I/II tumors. Both of them also had two HLA matches with Bria-IMT™. Two other patients with grade
II tumors (patient 03-001 and 06-001) had stable disease on the study and were also considered to have received clinical benefit
from the treatment. (Clinical benefit was defined as some evidence of tumor shrinkage (including a mixed response with shrinkage
of some tumors but progression of others, as for 05-002) with over 90 days on study; or as stable disease, a partial response or
a complete response as per RECIST criteria). Neither 03-001 or 06-001 had HLA matches with Bria-IMT™, suggesting that HLA matching
may not be required for clinical benefit in patients with grade I/II tumors. Thus, four of the six patients with grade I/II tumors
exhibited clinical benefit. One of the remaining patients showed no evidence of an immune response as evaluated by DTH. Thus, four
of the five grade I/II patients able to develop an immune response, as noted by DTH, exhibited clinical benefit.
●
These
preliminary data indicate that the Bria-IMT™ regimen in advanced breast cancer patients is well tolerated, able to elicit an
immune response and able to induce reduction in tumor burden.
13
●
Another
phase I/IIa study (BRI-ROL-001) was initiated evaluating the combination of the Bria-IMT™ regimen with KEYTRUDA® (pembrolizumab).
This combination combines the induction of an immune response by Bria-IMT™ (i.e. “putting the foot on the gas”
of the immune response) with the ability of KEYTRUDA® to block the PD-1 – PD-L1 immune checkpoint (i.e. to “take
the foot off the brakes” of the immune response).
●
Eleven
patients with advanced breast cancer (median of four prior systemic therapy regimens) have been treated with this regimen with cycles
every three weeks for a median of three cycles (range 1 – 9 cycles).
●
Two
patients had evidence of tumor regression, both of whom had robust immune responses (as measured by DTH) to Bria-IMT™. Both
of them had grade II tumors. One matched Bria-IMT™ at two HLA types (06-005) while the other did not match Bria-IMT™
at any HLA types (06-001, who “rolled over” from the WRI-GEV-007 study where she had stable disease), suggesting that
the Bria-IMT™ regimen, when given in combination with a PD-1 inhibitor, may be able to induce tumor regression without an HLA
match especially in patients with grade I/II tumors. One additional patient (06-004) in this study had a grade II tumor and was noted
to have stable disease. The other seven patients treated had grade III tumors (poorly differentiated). Thus, all three of the patients
with grade I/II tumors showed evidence of clinical benefit.
●
Following
the establishment of a collaboration with Incyte Corporation, this study is being altered to evaluate the combination of the Bria-IMT™
regimen with INCMGA00012 (anti-PD-1 antibody similar to KEYTRUDA®) and epacadostat (inhibitor of IDO, which suppresses the immune
response). The combination with KEYTRUDA® has been discontinued but may be resumed in other studies.
●
The
data confirms the “HLA Matching Hypothesis” and supports BriaCell’s strategy for the development of Bria-OTS™,
BriaCell’s first personalized off-the-shelf immunotherapy for advanced breast cancer.
About
Bria-IMT™
Developed
and characterized by a team of dedicated scientists and clinicians, Bria-IMT™ (SV-BR-1-GM) is a targeted immunotherapy being developed
for the treatment of breast cancer. Bria-IMT™ is a genetically engineered human breast cancer cell line with features of immune
cells and clinically applied as a targeted immunotherapy.
In
short, Bria-IMT™ immunotherapy is a genetically engineered human breast cancer cell line derived from a grade II tumor which activates
the immune system to attack and destroy breast cancer tumors.
Mechanism
of Action of Bria-IMT™
The
mechanism of action of Bria-IMT™ is currently under investigation. It is likely that the expression of certain breast cancer antigens
(proteins expressed in breast cancer cells) in Bria-IMT™ generates strong T cell and potentially antibody responses – resulting
in recognition and destruction of cancerous cells. 37
Bria-IMT™
is designed to secrete GM-CSF, a factor that stimulates components of the immune system. Specifically, GM-CSF activates dendritic cells,
the cells that start immune responses. These activated dendritic cells then activate T cells, a key component of the immune system, to
recognize the tumor cells as foreign, and eliminate them. To amplify this action, we have combined Bria-IMT™ with other immune
system activators including cyclophosphamide (used in low doses to reduce immune suppression), and interferon-α, a cytokine that
further activates the immune system. We believe this approach of simultaneous activation of the immune system via different pathways
will improve the immune system response to attack and destroy cancer cells.
14
Bria-OTS™
Using
BriaCell’s novel technology platform and our strong research and development capabilities, BriaCell plans to develop Bria-OTS™,
a personalized off-the-shelf immunotherapy for breast cancer, and similar immunotherapy cell lines for other cancer indications.
●
Bria-OTS™
is under development as an off-the-shelf personalized immunotherapy for advanced breast cancer.
●
The concept
for Bria-OTS™ comes from BriaCell’s work with Bria-IMT™, where BriaCell noted that if a patient “matches”
Bria-IMT™ in their HLA type, they were more likely to respond.
●
HLA molecules
are the molecules that start immune responses but are polymorphic – i.e. they are different in different people, although some
people will share the same HLA molecules (referred to as HLA alleles or HLA types).
●
Bria-OTS™
is made from cell lines that are genetically engineered to expresses the immune boosters GM-CSF and interferon-α, as well as
specific HLA types (a.k.a. alleles).
●
Different
cell lines are being pre-manufactured to express different HLA types covering >99% of the overall breast cancer patient population.
●
Using
the BriaDX™, a companion diagnostic test performed on the patient’s saliva, the suitable personalized treatment will
be selected for each patient for administration.
●
This approach
allows personalized treatment without the need for personalized manufacturing. Additionally, it saves time, and skips expensive and
complicated manufacturing procedures associated with other personalized treatments.
●
Bria-OTS™
cell lines are being engineered and transferred to good manufacturing practice (“ GMP ”) production in 2022 and
commencing clinical evaluation in 2022 (expected authorization by FDA and expected first patient to be dosed in 2022) with safety
and efficacy data expected to be released during 2022 and 2023.
BriaDx™
BriaDx™
is a diagnostic test that BriaCell is developing to identify the patients most likely to respond to Bria-IMT™. Currently, BriaDx™
includes HLA typing of the patients, as patients having HLA alleles also present in Bria-IMT™ appear to have a higher likelihood
of responding to the Bria-IMT™ regimen with tumor shrinkage. Additional markers of potential diagnostic use are being developed
based on the expression of specific biomarkers in the responder (i.e. biomarkers which identify the patients for which Bria-IMT™
immunotherapy appears more effective) vs the non-responder patients from clinical studies of Bria-IMT™ in advanced breast cancer
patients.
Blood
and tumor samples from the patients are analyzed using cutting-edge technologies including gene expression analysis and assessment of
the levels of antibodies predicted to bind to Bria-IMTTM.
The
insights gained from biomarker studies conducted to date have provided us with a solid basis for the development of Bria-OTS™,
an off-the-shelf personalized immunotherapy which would match over 99% of patients with advanced breast cancer.
37
Lacher M.D., Bauer G. Fury B., Graeve S., Fledderman E.L., Petrie T.D., Coleal-Bergum D.P., Hackett T., Perotti N.H., Kong Y.Y.,
Kwok W.W., Wagner J.P., Wiseman C.L., and Williams W.V. SV-BR-1-GM, a Clinically Effective GM-CSF- Secreting Breast Cancer Cell Line,
Expresses an Immune Signature and Directly Activates CD4+ T Lymphocytes. Frontiers in Immunology 2018; 9: Article 776.
15
BriaDx™
is being developed to help understand which patients are most likely to respond to Bria-IMT™ targeted immunotherapy. Based on the
proposed mechanism of action of Bria-IMT™, HLA molecules play a key role inducing cellular immune responses to Bria-IMT™
which boosts the patient’s immune response to their cancer.
HLA
molecules are polymorphic, in that they are different in different individuals, but shared by some individuals (similar to eye color).
Based on our clinical data to date, we hypothesize that patients with HLA alleles also present in Bria-IMT™ have a higher likelihood
of responding to the Bria-IMT™ regimen with tumor regression. Therefore, BriaDx™, a companion diagnostic test, determines
the patients’ HLA types.
Available
Clinical Data for Treatment with the Bria-IMT™ Regimen
BriaCell
conducted three Proof of Concept clinical trials, one using parental SV-BR-1 cells and the other two using Bria-IMT™ (i.e. genetically
engineered SV-BR-1 cells – producing GM-CSF also called SV-BR-1-GM), in metastatic (i.e. Stage IV) breast cancer patients who had
failed prior treatments. The patients were treated with the Bria-IMT™ regimen according to the following schedule, and the results
are summarized below.
Treatment
schedule:
● Cyclophosphamide
300 mg/m2 intravenously 2-3 days prior to Bria-IMT™ inoculation
● Bria-IMT™
20 million irradiated cells given intradermally split into 4 inoculations (2 in the upper
back and 2 in the thighs)
● Interferon
alpha-2b 10,000 units into each inoculation site 2 and 4 days after the Bria-IMT™ inoculations
● Treatment
cycles every 2 weeks for four weeks (3 inoculations) then every month.
16
First
Proof of Concept Trial
●
Used unmodified cell line (parental
SV-BR-1 cells) + GM-CSF + cyclophosphamide.
●
N = 14 late stage, treatment-refractory
breast cancer patients.
●
No significant adverse treatment-associated
events, well tolerated.
●
Median Overall Survival = 12.1
months.
Second
Proof of Concept Trial
●
Used Bria-IMT™
(i.e. genetically engineered SV-BR-1 cells – producing GM-CSF) with pre-dose, low dose cyclophosphamide and post-dose local
interferon-α to boost the response (the Bria-IMT™ regimen) with cycles every two weeks for four weeks (three inoculations)
then monthly up to a total of six cycles.
●
N = 4
late stage, treatment-refractory (3 breast cancer (2 grade II and 1 grade III), and 1 ovarian cancer) patients.
●
No significant
adverse treatment-associated events, well tolerated.
●
Median
Overall Survival = 35 months.
●
One robust
responder with greater than 90% regression during treatment and a subsequent relapse (upon halting treatment) responded to re-treatment.
●
This patient
matched Bria-IMT™ at a key HLA type (HLA-DR) and had a grade II tumor.
Third
Proof of Concept Trial
Thirty
patients were screened, 24 enrolled and 23 dosed in the Phase I/IIa study (2017-2018).
●
The Bria-IMT™
regimen included pre-dose low-dose cyclophosphamide (to reduce immune suppression), intradermal inoculation with 20-50 million irradiated
Bria-IMT™ cells between two and three days later, with subsequent intradermal inoculation with interferon-α2b approximately
two and four days later. The majority of adverse events (“ AEs ”) were limited to expected minor local irritation
at the injection sites.
●
The 23
patients treated with this regimen received cycles every two weeks for the first month and then monthly. They were heavily pre-treated
with a median of four prior systemic therapy regimens.
●
Patients
were treated with a median of three cycles of therapy (range 1-8).
●
The Bria-IMT™
regimen was able to elicit both cellular immune responses (as evidenced by DTH responses in 85% of patients evaluated) and antibody
responses (present in 58% of patients evaluated).
●
There
were no serious, unexpected, drug-related AEs.
Most
patients who withdrew from the trial did so due to the worsening of their underlying disease. Specifically, 14 patients terminated participation
due to progressive disease, four withdrew, three terminated participation due to mortality (unrelated to study drug), and two terminated
participation due to adverse events (both judged unrelated to study drug).
In
the combined experience of the second and third studies (which both use the same Bria-IMT™ regimen), disease control (i.e. stable
disease or partial response) was evaluated.
17
●
Disease control was seen in
four of twenty patients who match with Bria-IMT™ at one or more HLA locus, including in three of six patients who match Bria-IMT™
at two or more HLA loci, further supporting our “HLA Matching Hypothesis”, and the development of Bria-OTS ™ to
single match over 99% and double match approximately 90% of the patient population.
●
Effectiveness also depends
on the ability of the patient to develop an immune response to Bria-IMT™, as measured by DTH to the Bria-IMT™ or to the
parental cell line (SV-BR-1). Across both “monotherapy” studies (SVMC #01-026 and WRI-GEV-007), a positive DTH response
was noted in 22 patients while five were not responsive.
●
Results are shown in the tables
below, combining the second and third proof of concept studies, both of which used Bria-IMT™ in an identical regimen.
Disease
Control* in Studies SVMC #01-026 and WRI-GEV-007 Based on HLA Matching to Bria-IMT™ and Immune Response to Treatment
Patients
HLA Match
Disease Control
Disease Control in Immune Responders
N=6
≥2
50 %
75 %
N=20
≥1
25 %
33 %
N=7
0
29 %
29 %
All Patients N=27
26 %
32 %
Disease
Control in Studies SVMC #01-026 and WRI-GEV-007 Based on Tumor Grade
Patients
Grade
I/II
Disease
Control
All
Patients N=27
8
63
%
Immune
Responders (as measured by DTH)
Immune
Responders N=22
7
71
%
●
Bria-IMT™
was dosed in 27 patients (four in 2004-2006, 23 in 2017-2018) as the Bria-IMT™ regimen alone.
●
Bria-IMT™
has been very well tolerated (over 100 doses given to date).
●
Tumor
regression was seen in patients who were able to mount an immune response and matched Bria-IMT™ at HLA types, confirming our
main hypothesis and supporting using HLA typing as a marker to predict who is most likely to respond.
●
BriaCell
continues to monitor their clinical trials, proposing that BriaDx™ would include HLA typing as well as other potential biomarkers
(such as tumour grade or the ability to mount a DTH response) to identify the patients most likely to respond to the Bria-IMT™
regimen.
Development
of Additional Immunotherapy Cell Lines
●
Based
on these observations, BriaCell is extending this technology to other types of cancer by developing additional immunotherapy cell
lines.
●
Cell lines
currently being genetically engineered include a breast cancer cell line, a prostate cancer cell line, a non-small cell lung cancer
cell line and a melanoma cell line.
●
Initial
steps in the genetic engineering have been completed with subsequent steps planned for 2022 and 2023.
●
IND filings
for these immunotherapy cell lines are anticipated starting in 2022.
18
Protein
Kinase C Delta (PKCδ) Inhibitors
Overview
The
delta isoform of the Protein Kinase C family (PKCδ) is implicated in a multitude of cellular responses to external and internal
stimuli, playing both pro- and anti-tumorigenic roles. In contrast to PKCα, PKCδ does not seem to be required for survival
of normal cells. In PKCδ knockout mice, mild lymphoproliferation was observed, but overall, PKCδ inhibition is well tolerated
at the organismal level. BriaCell scientists develop small-molecule PKCδ inhibitors for use in those situations where PKCδ
carries out pro-tumorigenic functions. Preliminary data suggest that PKCδ inhibition may be particularly beneficial in a subset
of cancers with oncogenic Ras or with otherwise activated Ras signaling, for instance in endometrial cancers with estrogen-induced K-Ras
stabilization. In particular, PKCδ inhibition may be of therapeutic use in cancers dependent on Ras signaling for proliferation,
as shown in vitro for lung cancer. BriaCell, through our subsidiary Sapientia, uses structural information of Rottlerin, a PKCδ
inhibitor with modest activity, and Staurosporine, a potent but nonspecific PKC inhibitor, to develop a series of “hybrid”
compounds. This rational design approach is envisioned to yield molecules with, compared to Rottlerin, enhanced activity yet retained
PKC δ-selectivity.
Strategy
and Results
PKCδ
inhibition was achieved with small molecules using a pharmacophore model based on Staurosporine and Rottlerin. One of the most promising
molecules based on this approach, BC106 (BJE6-106), presents an IC 50 for PKCδ inhibition of approximately 50 nM and
is approximately 1000-fold more selective for PKCδ than for PKCα. In cellular and animal model studies, BC106 shows effective
anti-proliferative and anti-tumor activity, but this molecule is not water soluble, hence not appropriate as a drug candidate. Efforts
to improve water solubility have been initiated, with a series of compounds undergoing testing in in vitro kinase and cell-based
assays.
To
develop PKCδ inhibitors, BriaCell affiliates started with two molecules known to have PKC-inhibitory properties: Staurosporine
and Rottlerin. Multiple chemical manipulations and testing resulted in BC106, one of the Company’s most effective compounds to-date.
Staurosporine is a well-known PKC inhibitor with anti-cancer activity, while Rottlerin, also known as Mallotoxin, opens potassium channels
that have been used to induce apoptosis. Rottlerin has also been shown to be an immunosuppressive agent, affecting multiple oncogenic
pathways. Although some reports claim that Rottlerin does not act primarily via PKCδ inhibition, BriaCell’s data supports
Rottlerin-derived molecules as viable tumor suppressors.
The
Company’s strategy for compound synthesis is based on a hitherto unexplored design concept, wherein functional moieties of two
natural products known to strongly inhibit PKCδ – Rottlerin and Staurosporine – have been “intellectually cut”
from each natural product and then covalently joined to make a novel, chimeric scaffold. The Company’s synthetic analogs, in essence,
combine the bottom benzopyran moiety of Rottlerin and chemically join that to the indolyl carbazole moiety of Staurosporine. Further,
new chimeric scaffolds are synthesized in a novel, convergent modular fashion, allowing for the rapid assembly and testing of many derivatives.
Rottlerin
was initially used because this molecule inhibits purified PKCδ at an IC 50 of 3-5 μM in vitro , and in cultured
cells with an IC 50 of 5 μM. Rottlerin is relatively more selective for PKCδ than for PKCα (PKCδ IC 50 :PKCα
IC 50 ≈ 1:30). BriaCell further advanced our pharmacophore model using the Rottlerin-based prototype chimeric structure
in combination with Staurosporine by incorporating protein structural data for the novel class PKCs. This strategy produced a second
generation of PKCδ inhibitors with the “head” group resembling that of Staurosporine and the other domains conserved
from the Rottlerin scaffold to preserve isozyme specificity. A second generation successful product is represented by BC128, which has
an IC 50 of 4 μM for PKCδ (similar to Rottlerin), and better isozyme selectivity (IC 50 of >120 μM
for PKCα). BC128 showed anti-tumor cell activity in vitro and in vivo .
19
BC106,
BriaCell’s most-recent “lead” compound, produces substantial cytotoxicity against multiple human tumor lines at nM
concentrations (10-40 times lower than Rottlerin or BC128). BC106 dramatically inhibited the clonogenic capacity of RAS-mut tumor cell
lines after as little as 12 hours of exposure. BC106 is 1000-fold more selective for PKCδ than for PKCα. The latter is an
important finding because inhibition of PKCα is generally toxic to all cells (normal and malignant) and would make BC106 non-tumor-targeted.
Approximately
40% of melanomas harbor NRAS mutations and there is no effective RAS-targeted treatment available for this subgroup. BriaCell affiliates
have demonstrated that NRAS-mutant melanoma cells were highly sensitive to PKCδ siRNA knock-down and to BC106 at nM concentrations.
Clonogenic assays demonstrated that irreversible inhibition of proliferation required as little as 12 hours of exposure to Rottlerin
or BC106.
BriaCell
affiliates also assessed the effects of PKCδ inhibition on breast tumor growth and survival in a xenograft human breast cancer
stem cell model. PKCδ inhibition prevented tumor grown and promoted the survival of the animals evaluated over the course of 300
days (note that the vehicle treated animals all died within the first 20 days of the study).
Furthermore,
PKCδ inhibition also inhibited the growth of neuroendocrine cells.
Summary
and Outlook – Early Stage Preclinical Program
●
Thirty
percent of all human malignancies display activating RAS mutations, with another 60% showing over-activity of Ras-signaling pathways. 38
●
BriaCell’s
novel, proprietary PKCδ inhibitors have shown activity against multiple RAS transformed tumors. 39
●
This target
has an attractive safety profile based on in vivo studies and knock out mouse studies. 40
●
PKCδ
also has potential activity as an immunotherapeutic by blocking TGFβ signaling. 41
●
PKCδ
inhibitors are applicable to specific niche tumor types which provide an accelerated clinical development plan.
●
Structural
aspects of first-generation inhibitor rottlerin and staurosporine ([a] pan-PKC inhibitor) were combined to create second generation
inhibitor KAM1.
●
Third
generation inhibitors such as BC-106 have improved potency and selectivity.
●
Fourth
generation inhibitors are under development to optimize their drug-like characteristics.
●
PKCδ inhibitors lack endothelial cell cytotoxicity, while PKCδ deficient mice develop normally and are fertile. This shows
that there is no marked intrinsic toxicity as a result of inhibiting PKCδ.
●
Candidate
selection is anticipated in 2022.
38
Prior IA, Lewis PD, Mattos C. A comprehensive survey of Ras mutations in cancer. Cancer Res. 2012 May 15; 72(10): 2457–2467.
39
Xia, S., Forman, L. W. & Faller, D. V. Protein Kinase Cδ Is Required for Survival of Cells Expressing Activated p21 RAS .
J. Biol. Chem. 282, 13199–13210 (2007); Chen, Z. et al. Protein kinase Cδ inactivation inhibits cellular proliferation and
decreases survival in human neuroendocrine tumors. Endocr. Relat. Cancer 18, 759–71 (2011); Xia, S., Chen, Z., Forman, L. W. &
Faller, D. V. PKCδ survival signaling in cells containing an activated p21Ras protein requires PDK1. Cell. Signal. 21, 502–508
(2009); Liou, J. S., Chen, C.-Y., Chen, J. S. & Faller, D. V. Oncogenic Ras Mediates Apoptosis in Response to Protein Kinase C Inhibition
through the Generation of Reactive Oxygen Species. J. Biol. Chem. 275, 39001–39011 (2000); Liou, J. S., Chen, J. S. & Faller,
D. V. Characterization of p21Ras-mediated apoptosis induced by protein kinase C inhibition and application to human tumor cell lines.
J. Cell. Physiol. 198, 277–294 (2004); Chen, C. Y., Liou, J., Forman, L. W. & Faller, D. V. Differential regulation of discrete
apoptotic pathways by Ras. J. Biol. Chem. 273, 16700–9 (1998); Chen, C. Y. & Faller, D. V. Direction of p21ras-generated signals
towards cell growth or apoptosis is determined by protein kinase C and Bcl-2. Oncogene 11, 1487–98 (1995); Chen, C. Y. & Faller,
D. V. Phosphorylation of Bcl-2 protein and association with p21Ras in Ras-induced apoptosis. J. Biol. Chem. 271, 2376–9 (1996);
Chen, C.-Y., Liou, J., Forman, L. W. & Faller, D. V. Correlation of genetic instability and apoptosis in the presence of oncogenic
Ki-Ras. Cell Death Differ. 5, 984–995 (1998); Chen, C. Y. et al. The recruitment of Fas-associated death domain/caspase-8 in Ras-induced
apoptosis. Cell Growth Differ. 12, 297–306 (2001).
40
Miyamoto A, Nakayama K, Imaki H, Hirose S, Jiang Y, Abe M, Tsukiyama T, Nagahama H, Ohno S, Hatakeyama S, Nakayama KI. Increased
proliferation of B cells and auto-immunity in mice lacking protein kinase Cdelta. Nature. 2002 Apr 25;416(6883):865-9.
41
Wermuth PJ, Addya S, Jimenez SA. Effect of Protein Kinase C delta (PKC-δ) Inhibition on the Transcriptome of Normal and Systemic
Sclerosis Human Dermal Fibroblasts In Vitro. PLoS ONE, November 2011, Volume 6, Issue 11, e27110; PMCID: PMC3214051; Li Z, Jimenez SA.
Protein Kinase C δ and c-Abl Kinase Are Required for Transforming Growth Factor β Induction of Endothelial–Mesenchymal
Transition In Vitro. Arthritis and Rheumatism, Vol. 63, No. 8, August 2011, pp 2473–2483 PMCID: PMC3134600; Bujor AM, Asano Y,
Haines P, Lafyatis R, Trojanowska M. The c-Abl Tyrosine Kinase Controls Protein Kinase C δ –Induced Fli-1 Phosphorylation
in Human Dermal Fibroblasts. Arthritis & Rheumatism, Vol. 63, No. 6, June 2011, pp 1729–1737. PMCID: PMC3381734.
20
Early
Phase Programs
BriaCell
is developing multi-specific binding reagents that simultaneously bind to an immune cell and a cancer cell, or just to a cancer cell,
and activate the immune system against the cancer cells. The novel binding reagents are designed to act, among others, as potent immune
cell activators/immune checkpoint inhibitors without the toxicity of current checkpoint inhibitors. The expected effect is a highly targeted
therapy envisioned to selectively destroy cancer cells without affecting normal (i.e. non-cancerous) cells. This may mean less severe
side effects for the treated cancer patients compared to alternative therapies. The Company cautions that these novel therapeutics are
still in early-stage research and development and is not making any express or implied claims as to their success in cancer treatment
or commercial viability. The patent application seeks protection for, among others, the design of new therapeutics and methods for their
use. These are designated “Bria-TILs-Rx”. IND filings for Bria-TILs-Rx for the treatment of prostate cancer and epithelial
and glandular cancer, respectively, are anticipated to be made in 2022 and require an additional cost of approximately US$1,000,000 each.
On
October 28, 2020, BriaCell entered into a Cooperative Research and Development Agreement (“ CRADA ”) with the U.S. Department
of Health and Human Services, as represented by the NCI. Under the CRADA, NCI and BriaCell will work together to conduct preclinical
studies to develop and test BriaCell’s proprietary Bria-OTS cellular immunotherapy as a treatment for cancer, to improve and broaden
applicability of this therapeutic strategy. Under the terms of the CRADA, BriaCell will provide funding (totaling $433,400 over three
years) to support the project. The NCI estimates that 1.3 person-years of effort per year will be required to complete the CRADA research,
which includes the development of a mouse model of this therapeutic strategy. BriaCell and NCI will be using their combined expertise
in tumor immunology, molecular biology and development of cellular therapies to design studies which are intended to trigger the immunologic
pathways necessary to create potent immune responses against cancer. The goal of the collaboration is to develop novel therapeutics for
future clinical collaborations, allowing cancer patients to potentially benefit from potent and personalized cancer immunotherapy.
Mechanism
of Action of Bria-IMT™ and Bria-OTS™ 4
The
mechanism of action of Bria-IMT™/Bria-OTS™ is currently under investigation.
21
We
believe that Bria-IMT™/Bria-OTS™ activates the patient’s immune system to recognize tumor cells and destroy them. We
hypothesize that Bria-IMT™/Bria-OTS™ exerts its action via the patient’s antigen-presentation system (i.e. the system
that presents antigen material on the surface of cells for recognition by the T cells of the immune system as either self (i.e. safe)
or foreign (i.e. to be destroyed)). Specifically, Bria-IMT™/Bria-OTS is thought to stimulate dendritic cells, a key component of
the antigen-presenting system, to display certain immunogenic (i.e. immune response-generating) protein fragments to T cells, which activates
the T cells to destroy the tumor cells either directly, or indirectly by inducing a humoral (i.e. antibody-generating) immune response.
In addition, we also have shown that Bria-IMT™ is capable of directly stimulating T cells, thereby potentially adding additional
therapeutic benefits. The latter property of Bria-IMT™ is the basis of the Bria-OTS™ project as it requires HLA matching
between the therapeutic cells and the patient. 42
BriaCell’s
preliminary analyses have shown several up-regulated genes in Bria-IMT™ that encode proteins known to be immunogenic (i.e. immune
response-generating), suggesting that Bria-IMT™ can stimulate the immune system against the cancer cells.
Bria-IMT™
is a human breast cancer cell line which expresses Her2/neu (a protein well known for its overexpression in breast cancer but also associated
other epithelial malignancies, including ovarian, pancreatic, colon, bladder and prostate cancers). Bria-IMT™ has been engineered
to produce and secrete GM-CSF, a protein that promotes dendritic cell function, a key component of the immune system, and hence activates
the immune system.
Potential
Mechanisms of Specific Immune Activation in Advanced Breast Cancer
1.
Bria-IMT/OTS™ produces
breast cancer antigens (i.e. proteins made by breast cancer cells).
2.
Bria-IMT/OTS™ secretes
GM-CSF, which further promotes dendritic cell-based antigen presentation (i.e. boosts the response).
3.
Breast cancer antigens
are taken up by dendritic cells and “presented” to CD4+ and CD8+ T cells implicated in tumor destruction.
4.
Bria-IMT/OTS™ directly
stimulates cancer fighting CD4+ and CD8+ T cells (i.e. further boosts the response).
5.
Bria-IMT/OTS™ biological
activity depends on HLA matching of Bria-IMT/OTS™ and the patient.
Clinical
Trials
Phase
I/IIA Combination Study of Bria-IMT™ with Immune Checkpoint Inhibitors in Advanced Breast Cancer
The
FDA approved the combination study of Bria-IMT™ with immune checkpoint inhibitors in advanced breast cancer (third line or later).
The initial study used pembrolizumab (KEYTRUDA®, purchased by the Company as the Company does not have an agreement with Merck for
the supply of KEYTRUDA®). The Company dosed 11 patients with this combination and no dose limiting toxicities were observed. Additionally,
evidence of additive or synergistic activity was observed.
The
combination with KEYTRUDA® was discontinued and the study was subsequently modified to use a combination of Bria-IMT with the Incyte
PD-1 inhibitor retifanlimab (INCMGA00012). The Company anticipates additional safety and efficacy data for the combination of Bria-IMT™
with INCMGA00012 to be released throughout 2022 and 2023.
42
Lacher M.D., Bauer G. Fury B., Graeve S., Fledderman E.L., Petrie T.D., Coleal-Bergum D.P., Hackett T., Perotti N.H., Kong Y.Y.,
Kwok W.W., Wagner J.P., Wiseman C.L., and Williams W.V. SV-BR-1-GM, a Clinically Effective GM-CSF- Secreting Breast Cancer Cell Line,
Expresses an Immune Signature and Directly Activates CD4+ T Lymphocytes. Frontiers in Immunology 2018; 9: Article 776.
22
For
the year ended July 31, 2022, research costs amounted to $8,021,489 as compared to $2,020,899 for the year ended July 31, 2021. The increase
is attributed to the recommencing of the Company’s clinical trials and the increased activity in the lab, including the hiring
of additional lab employees.
We
may face difficulties recruiting or retaining patients in our ongoing and planned clinical trials if patients are affected by the virus
or are fearful of visiting or traveling to our clinical trial sites because of the outbreak of COVID-19. In the event that clinical trial
sites are slowed down or closed to enrollment in our trials, this could have a material adverse impact on our clinical trial plans and
timelines. We are continuing to assess our business plans and the impact COVID-19 is having on our clinical trial timelines and our ability
to recruit candidates for clinical trials, but there can be no assurance that this analysis will enable us to avoid part or all of any
impact from the spread of COVID-19 or its consequences, including downturns in business sentiment generally or in our sector in particular.
The extent to which COVID-19 and global efforts to contain its spread will impact our operations will depend on future developments,
which are highly uncertain and cannot be predicted at this time, and include the duration, severity and scope of the outbreak and the
actions taken to contain or treat the coronavirus outbreak. We currently believe that the execution of our clinical trials and research
programs will be delayed by at least one quarter due to COVID-19.
One
patient transitioned from combined treatment of the Bria-IMT™ regimen with KEYTRUDA® to combination treatment with retifanlimab.
She has continued to have stable disease, with further reduction in the size of some of her breast cancer nodules around the brain, including
disappearance of one nodule behind the left eye which was causing proptosis (i.e. pushing the eye forward). This nodule has completely
disappeared and her eye has gone back into place.
Rationale
for the Combination Study of Bria-IMT™ with Immune Checkpoint Inhibitors
Immune
checkpoint inhibitors, such as anti-PD-1 antibodies, have come to the forefront in the fight against cancer, with substantial benefits
for some patients. Recently, the significance of immune checkpoint inhibitors was recognized by the Nobel committee by awarding Dr. Tasuku
Honjo and Dr. James P. Allison with the 2018 Nobel Prize in Physiology or Medicine (scientists behind game-changing cancer immunotherapies
win Nobel medicine prize) , validating the Company’s decision to initiate a combination therapy with immune checkpoint
inhibitors.
Drs.
Allison and Honjo independently, using different strategies, showed a new approach of treating patients by awakening certain cells of
the immune system, T cells, to attack tumors. This new approach of treating patients with immune checkpoint inhibitors (such as anti-PD-1
antibodies), designed to overcome immune suppression in cancer patients, is revolutionizing the fight against cancer.
In
2010, a pre-clinical study by Dr. Allison’s research group showed that combination with anti-PD-1 antibodies potentiated the tumor-destroying
effect of melanoma cells engineered to produce GM-CSF, a substance that activates the immune system, compared to the treatment with the
GM-CSF producing cells alone. Bria-IMT™, a breast cancer cell line, also produces GM-CSF. Bria-IMT™ has been shown to indirectly
and directly stimulate T cells, and hence has displayed immune-activating properties. BriaCell has published these findings in a leading
immunology journal. It is important to note that anti-PD-1 antibodies have not been shown to work on their own in breast cancer.
KEYTRUDA®
(pembrolizumab)
Manufactured
by Merck & Co., Inc., KEYTRUDA® (pembrolizumab) is a prescription medicine that may treat certain cancers by working with the
immune system. It has been approved for the treatment of a number of cancer indications, excluding breast cancer. The company is not
a party to any agreements with Merck for the supply of KEYTRUDA®.
23
●
A phase I/IIa study was
performed evaluating the combination of the Bria-IMT™ regimen with KEYTRUDA® (pembrolizumab). This combination combines
the induction of an immune response by Bria-IMT™ (putting the foot on the gas of the immune response) with the ability of KEYTRUDA®
to block the PD-1 – PD-L1 immune checkpoint (i.e. taking the foot off the brakes of the immune response).
●
Eleven patients with advanced
breast cancer (with a median of four prior systemic therapy regimens) were treated with this regimen, with cycles every three weeks
for a median of three cycles each (range: 1 – 9 cycles).
●
Two patients had evidence
of tumor regression, both of whom had grade II tumors and also had robust immune responses (as measured by DTH) to Bria-IMT™.
One matched Bria-IMT™ at two HLA types while the other did not match Bria-IMT™ at any HLA types, suggesting that the
Bria-IMT™ regimen, when given in combination with a PD-1 inhibitor, may be able to induce tumor regression without an HLA match,
especially in patients with grade I/II tumors. One other patient in this cohort had a grade II tumor and that patient had stable
disease. Thus, of the three patients with grade I/II tumors treated with the combination of the Bria-IMT™ regimen with pembrolizumab,
all three showed evidence of a clinical benefit, as typically defined in clinical research. BriaCell purchased the KEYTRUDA®
for this study without a collaboration with Merck while pursuing other avenues to collaborate with a company that has an anti-PD-1
antibody and/or other immune checkpoint inhibitors to use in combination with the Bria-IMT™ regimen. BriaCell has obtained
such an agreement with Incyte Corporation as noted below. Based on this, the combination therapy study (BRI-ROL-001) had been amended
to evaluate combination of the Bria-IMT™ regimen with Incyte’s PD-1 inhibitor as noted below. The combination
with KEYTRUDA® has been discontinued.
BriaCell
& Incyte Collaboration and Supply Agreement
The
following summarizes the non-exclusive clinical trial collaboration to evaluate the effects of combinations of novel clinical candidates:
●
The clinical study focuses
on BriaCell’s lead candidate, Bria-IMT™, in combination with Incyte’s retifanlimab, for treatment of advanced
breast cancer.
●
Incyte is providing retifanlimab,
an anti-PD-1 monoclonal antibody, for use in combination studies with BriaCell’s lead candidate, Bria-IMT ™.
●
Incyte is a global biopharmaceutical
company focused on discovering and developing novel therapeutics in oncology and other serious diseases.
●
The first twelve patients
will receive the Bria-IMT™ regimen in combination with retifanlimab. Once safety of the combination has been established, an
expansion cohort of 24 subjects will be evaluated. This expansion cohort will be limited to patients who match Bria-IMT™
at one or more HLA alleles and/or have Grade I/II disease.
●
Dosing of the novel combinations
commenced in the fourth quarter of 2019 and is ongoing.
●
The Company anticipates
safety and efficacy data to be released during 2022 and 2023.
●
Pending discussions with
the U.S. Food and Drug Administration (“ FDA ”), a registration study focused on, but not limited to, Bria-IMT™,
in combination with Incyte’s selected compounds for advanced breast cancer, is planned to commence in late 2022 or early 2023
with the Bria-OTS™ program following by approximately 8-10 quarters.
24
Additional
data was presented at the American Association for Cancer Research San Antonio Breast Cancer Meeting on December 10-11, 2020. The data
presented summarized the clinical and pathological data of the Bria-IMT™ monotherapy (i.e. the Bria-IMT™ regimen alone) study
and the Phase I/IIa clinical study of Bria-IMT™ in combination with immune checkpoint inhibitors, including pembrolizumab (KEYTRUDA®;
manufactured by Merck & Co., Inc.), and more recently, Incyte’s retifanlimab (developed by Incyte Corporation), in advanced
breast cancer. Thirty patients were treated with the Bria-IMT™ regimen (19 with the Bria-IMT™ regimen alone, four who began
on the Bria-IMT™ regimen and transitioned to a combination of Bria-IMT™ with Incyte’s retifanlimab, and seven with
a combination of Bria-IMT™ with KEYTRUDA®). Eleven of those patients had moderately-well differentiated tumors. Seventy percent
of these patients who were able to develop an immune response showed disease control, suggesting that Bria-IMT™, with a molecular
signature most closely related to moderately-well differentiated tumors, may result in disease control, especially in patients with moderately-well
differentiated tumors. These patients were very heavily pre-treated with a median of seven prior systemic therapy regimens (including
chemotherapy, biological and “targeted” therapy). The median PFS of this cohort was 5.7 months in the monotherapy study,
and 6.9 months in combination therapy. Of the group, there were nine patients with evaluable lesions including six with stable disease
and two with partial responses according to RECIST criteria. One patient with stable disease had a marked reduction in numerous non-target
lesions. The data suggests clinical and survival benefits for patients with moderately-well differentiated tumors who were treated with
the Bria-IMT™ regimen with or without check point inhibitors. Notably, the survival benefit was higher in the group that received
the Bria-IMT™ regimen with check point inhibitors, suggesting an additive or synergistic effect.
The
median OS for the combined monotherapy and combination therapy was 12.5 months (data on six patients with moderately-well differentiated
tumors). An OS of 7.2-9.8 months in similar patients with metastatic breast cancer in the third line setting has recently been published
(Kazmi S, et al. “Overall survival analysis in patients with metastatic breast cancer and liver or lung metastases treated with
eribulin, gemcitabine, or capecitabine.” Breast Cancer Res Treat. 2020). This suggests a potentially significant survival benefit
for the patients treated with the Bria-IMT™ regimen alone or in combination with check point inhibitors.
Marketing
and Sales Strategy
The
product will initially be marketed to oncologists who are well-versed in the use of immunotherapy for cancer. Partnering with other pharmaceutical
companies in order to market combinations with a number of drugs is also an option that we intend to pursue. This study will utilize
a frozen formulation which consists of irradiated SV-BR-1-GM cells in viable freezing media. This formulation will permit stockpiling
of the immunotherapy so that it can be sent on demand to clinical sites. The eventual goal is to reach all oncologists who treat late
stage breast cancer, either by direct outreach or by partnering with another company that has an established presence in the oncology
space.
Other
Commercial Considerations
There
is a high unmet medical need in late-stage breast cancer, providing potential for accelerated approval of Bria-IMT™. The FDA is
interested in facilitating the availability of novel therapies of patients with unmet medical needs, especially those that can target
the population most likely to respond. In addition, the FDA has granted “Fast Track” status to BriaCell’s lead candidate,
Bria-IMT™, for the treatment of metastatic breast cancer. These two facts may help facilitate the accelerated approval of Bria-IMT™.
Production
and Marketing Plan
Bria-IMT™
cells grow in simple tissue culture media and are irradiated prior to inoculation. Bria-IMT™ manufacturing will be performed by
Contract Manufacturing Organizations. We have been working with KBI Biopharma, Inc. (“ KBI ”) and the University of
California, Davis Health System (“ UC Davis ”) GMP facility, who have developed a frozen formulation where the cells
are grown, harvested and irradiated, followed by cryopreservation in a viable state. The cells are stockpiled and shipped directly to
clinical sites for inoculation. Each lot of Bria-IMT™ is tested for potency (i.e. GM-CSF production), identity (i.e. HER2+ and
ER/PR-) and adventitious agents to rule out contamination with infectious agents. To date, there have been no issues with these tests.
Additional manufacturing facilities have been evaluated and may be enlisted as demand grows.
25
Marketing
will target oncologists who are well-versed in the use of immunotherapy and especially breast cancer treatment centers. The initial target
will be patients with metastatic or recurrent breast cancer who have failed at least two prior treatment regimens. We plan to develop
the clinical data for Bria-IMT™ and to use this information to reach out to oncologists seeking additional therapeutic options
for their patients. We will include in this effort a physician education campaign targeting the oncologists most likely to treat metastatic
breast cancer. As these physicians become more aware of the data regarding Bria-IMT™ in breast cancer, we will make sure they also
understand how best to use Bria-IMT™ in combination with other therapies that have complementary synergistic mechanisms of action.
This will also come from the clinical studies described above focusing on combination therapy. Partnering with other pharmaceutical companies
in order to market a number of drugs is also an option that we intend to pursue. Our eventual goal is to reach all oncologists who treat
late stage breast cancer, either by direct outreach or by partnering with another company that has an established presence in the oncology
space.
License
Agreements
On
July 24, 2017, the Company entered into a Share Exchange Agreement with its wholly-owned subsidiary, BriaCell Therapeutics Corp., Sapientia,
and all the shareholders of Sapientia. Sapientia, a biotechnology company based in Havertown, PA, is developing novel targeted therapeutics
for multiple indications, including several cancers and fibrotic diseases.
Pursuant
to the terms of the Share Exchange Agreement, BriaCell Therapeutics Corp. agreed to acquire from the Sapientia shareholders all of the
issued and outstanding shares in the capital of Sapientia in consideration to the Sapientia shareholders, pro rata, of an aggregate of
8,333 common shares in the capital of BriaCell (the “ Transaction ”), which were issued on September 5, 2017.
As
part of the Transaction, BriaCell acquired the license agreement Sapientia entered into with Faller-Williams Technology (“ FWT ”),
dated March 16, 2017, (the “ License Agreement ”), pursuant to which BriaCell acquired all rights, including composition
of matter patents (the “ PKCδ Patents ”), and preclinical study data to a novel therapeutic technology platform,
PKCδ inhibitors, which represents a unique, highly-targeted approach to treat cancer and to boost the immune system.
Pursuant
to the License Agreement, FWT is eligible to receive certain milestone payments, including i) $5,000,000 upon the filing of each New
Drug Application with the FDA with respect to products disclosed and/or described in the PKCδ Patents (the “ PKCδ
Products ”); ii) $25,000,000 upon final approval of each New Drug Application by the FDA for the marketing of a PKCδ Product;
iii) $1,000,000 upon the filing of each Marketing Authorization Application (“ MAA ”) with the Medicines and Healthcare
Products Regulatory Agency of United Kingdom or the Committee for Medicinal Products for Human Use of the European Commission with respect
to a PKCδ Product; and iv) $5,000,000 upon the final approval of each MAA with the Medicines and Healthcare Products Regulatory
Agency of United Kingdom or the Committee for Medicinal Products for Human Use of the European Commission for the marketing of a PKCδ
Product.
FWT
is eligible to receive certain royalty payments under the License Agreement. Following the first commercial sale of a PKCδ Product
in the United States, FWT shall receive i) 5% of worldwide net sales of PKCδ Products encompassed by one or more valid claims of
the PKCδ Patents and/or improvements thereto, and ii) 2.5% of worldwide net sales from PKCδ Products not encompassed within
one or more valid claims of the PKCδ Patents. Additionally, upon BriaCell’s receipt of marketing approval for a PKCδ
Product from the FDA, the Medicines and Healthcare Products Regulatory Agency of United Kingdom, the Committee for Medicinal Products
for Human Use of the European Commission or an equivalent authority, FWT shall receive minimum royalty payments of $250,000 per year.
Unless
terminated earlier pursuant to the provisions therein, the License Agreement shall expire ten years after the last PKCδ Patent
expires.
Intellectual
Property
The
proprietary nature of, and protection for, the Company’s current and/or any future product candidates, processes and know-how are
important to its business, as is its ability to operate without infringing on the proprietary rights of others, and to prevent others
from infringing its proprietary rights. The Company seeks patent protection in the U.S. and internationally for its current and future
product candidates it may develop through other technology. In order to protect its proprietary technologies, the Company relies on combinations
of applications for patent and trade secret protection, as well as confidentiality agreements with employees, consultants, and third
parties.
26
The
Company has filed and own or have licensed all rights in the following pending patent applications and issued patents:
Filed
with the United States Patent and Trademark Office (“ USPTO ”) on June 14, 2004, U.S. Patent No. 7,674,456 B2, includes
claims to the following:
1.
Compositions comprising
SV-BR cells
2.
Therapeutic methods of
using said compositions
On
February 27, 2017, BriaCell filed an international patent application under the Patent Cooperation Treaty (“ PCT ”)
to further expand its intellectual property portfolio underlying the Company’s current and anticipated pipeline of whole-cell cancer
immunotherapeutics, including Bria-IMT™ and Bria-OTS™. The PCT application (PCT/US2017/019757) claims priority to two provisional
patent applications filed by the Company with the USPTO in 2016. In essence, it provides the framework for additional whole-cell cancer
immunotherapeutics beyond Bria-IMT™ and strategies for patient-specific selection of the most likely effective whole-cell immunotherapeutic
(BriaDx™). The PCT application entered the National Phase in the second half of 2018.
On
July 24, 2017, BriaCell obtained the exclusive license to certain patents related to PKCδ inhibitor technology, including patents
to specific compounds, methods of using the compounds, and methods of assessing patients regarding the compounds. These patents include
U.S. Patent No. 9,364,460, which was issued on June 14, 2016; U.S. Patent No. 9,572,793, which issued on February 21, 2017; U.S. Patent
No. 9,844,534, which was issued December 19, 2017; and EP Patent No. 2897610, which was issued on January 10, 2018.
To
the knowledge of the Company’s management, there are no contested proceedings or third-party claims over any of our patent applications.
Our success depends upon our ability to protect our technologies through intellectual property agreements including patents, trademarks,
know-how, and confidentiality agreements. However, there can be no assurance that the above-mentioned patent applications will be approved
by the appropriate agencies.
All
of the technology for which patents are currently sought is owned by the Company. Our patents are entirely owned or exclusively licensed
by the Company.
Competition
Cancer
immunotherapy has become a significant growth area for the biopharmaceutical industry, attracting large pharmaceutical companies as well
as small niche players. Generally, our principal competitors in the cancer immunotherapy market comprise both companies with currently
approved products for various indications, such as manufacturers of approved bispecific antibodies, CAR-T cells, and checkpoint inhibitors,
as well as companies currently engaged in cancer immunotherapy clinical development. The large and medium-size players who have successfully
obtained approval for cancer immunotherapy products include Bristol-Myers Squib Company, Merck & Co., Inc., Genentech, Inc. (a subsidiary
of Roche Holding AG), AstraZeneca PLC, Celgene Corporation, Johnson & Johnson/Janssen Pharmaceuticals, Amgen, Novartis, Acerta Pharmaceuticals
(a subsidiary of AstraZeneca), Juno Therapeutics, Inc. (a subsidiary of Celgene), Kite Pharma, Inc., a wholly-owned subsidiary of Gilead
Sciences, Inc. and Pfizer, Inc./EMD Serono, Inc. Most of these companies, either alone or together with their collaborative partners,
have substantially greater financial resources than does BriaCell.
Companies
developing novel products with similar indications to those we are pursuing are expected to influence our ability to penetrate and maintain
market share. For patients with early stage breast cancer, adjuvant therapy is often given to prevent recurrence and increase the chance
of long-term disease-free survival. Adjuvant therapy for breast cancer can include chemotherapy, hormonal therapy, radiation therapy,
or combinations thereof. In addition, the HER2 targeted drug trastuzumab (HERCEPTIN), alone or in combination with pertuzumab (PERJETA),
both manufactured and marketed by Roche/Genentech, may be given to patients with tumors with high expression of HER2 (IHC 3+), as well
as other novel targets such as MUC1, which may be useful in treating breast cancer. In addition, the FDA approved the first ever immunotherapy
regimen for breast cancer to the Roche/Genentech PD-L1 checkpoint inhibitor atezolizumab (TECENTRIQ), combined with Celgene’s nab-paclitaxel
(ABRAXANE) for TNBC that cannot be removed with surgery and is locally advanced or metastatic.
27
There
are a number of cancer vaccines in development for breast cancer, including but not limited to TPIV200 (Marker Therapeutics, Inc.), AE-37
(Antigen Express), and Stimuvax (Merck KgA). While these development candidates are aimed at a number of different targets, and AE-37
has published data in the HER2 breast cancer patient population, there is no guarantee that any of these compounds will not in the future
be indicated for treatment of low-to-intermediate HER2 breast cancer patients and become directly competitive with NPS.
Many
of our competitors, either alone or with their strategic partners, have substantially greater financial, technical and human resources
than we do, and also have greater experience in obtaining FDA and other regulatory approvals of treatments and commercializing those
treatments. Accordingly, our competitors may be more successful than us in obtaining approval for cancer immunotherapy products and achieving
widespread market acceptance. Our competitors’ treatments may be more effectively marketed and sold than any products we may commercialize,
thus causing limited market share before we can recover the expenses of developing and commercializing of our cancer immunotherapy product
candidate.
Mergers
and acquisitions in the biotechnology and pharmaceutical industries may result in even more resources being concentrated among a smaller
number of our competitors. Smaller or early stage companies may also prove to be significant competitors, particularly through collaborative
arrangements with large and established companies. These activities may lead to consolidated efforts that allow for more rapid development
of cancer immunotherapy product candidates.
These
competitors also compete with us in recruiting and retaining qualified scientific and management personnel, the ability to work with
specific clinical contract organizations due to conflicts of interest, and the conduct of trials in the ability to recruit clinical trial
sites and subjects for our clinical trials.
We
expect any products that we develop and commercialize to compete on the basis of, among other things, efficacy, safety, price and the
availability of reimbursement from government and other third-party payors. Our commercial opportunity could be reduced or eliminated
if our competitors develop and commercialize products that are viewed as safer, more convenient or less expensive than any products that
we may develop. Our competitors also may obtain FDA or other regulatory approval for their products more rapidly than we may obtain approval
for our current product candidates or any other future product candidate, which could result in our competitors establishing a strong
market position before we are able to enter the market.
Employees
As
of the date of this filing, we had eleven full-time employees and one part-time employee, located in various US states including:
NY, CA, PA, SC, HI, and NJ. We also have international employees located in Canada and Israel.
For
the year ended July 31, 2022, the average number of employees has been eight, of whom four were executive management.
Research
and Development Activities and Costs
For
information regarding our clinical studies, please see above under the caption “ Description of the Business – Clinical
Trials. ”
For
the years ended July 31, 2022 and 2021, we incurred $7,585,926 and $1,315,496, respectively, of net research and development expenses
(excluding share based compensation allocated to research and development employees)
28
Manufacturing
We
do not own or operate manufacturing facilities for the production of our product candidates, nor do we have plans to develop our own
manufacturing operations in the foreseeable future. We currently depend on third-party contract manufacturers for all of our required
raw materials, active pharmaceutical ingredients, and finished product candidate for our clinical trials. We currently employ internal
resources and third-party consultants to manage our manufacturing contractors.
Bria-IMT™
is currently manufactured under current Good Manufacturing Practices (“ cGMP ”) pursuant to agreements with UC Davis
and with KBI, which is located in The Woodlands, Texas.
On
June 11, 2015, the Company entered into an Agreement for Services with The Regents of the University of California, acting for and on
behalf of UC Davis, pursuant to which UC Davis manufactures Bria-IMT™ (previously known as BriaVax) at its GMP facility. The Company
pays UC Davis certain hourly rates depending on the specific services provided by UC Davis in connection with its manufacturing of Bria-IMT™.
Pursuant
to the Company’s master services agreement with KBI, dated March 17, 2017, KBI has conducted developmental studies to derive and
optimize a cryopreserved formulation of Bria-IMT™ (previously known as BriaVax) as a research working cell bank of final drug product
doses suitable for cold chain shipment (the “ KBI Services ”). The Company pays for the cost of materials, consumables,
and third party services, plus an additional 5% fee to compensate KBI for the cost of purchasing, material handling, inventory and administration
and management of third party services necessary for KBI to perform the KBI Services. The master services agreement with KBI terminates
on May 4, 2027.
On
July 5, 2022, BriaCell announced that it had entered into a manufacturing service agreement with Waisman Biomanufacturing at the University
of Wisconsin–Madison (“ Waisman ”), to manufacture Bria-Pros™, BriaCell’s off-the-shelf personalized
immunotherapy for prostate cancer, for anticipated use in clinical studies. Waisman is a leading contract manufacturing organization
with experience in the manufacturing of cellular therapies for clinical trials. Under the terms of the agreement, Waisman will be responsible
for GMP manufacturing of Bria-Pros™ for anticipated use in clinical studies. Waisman’s expert team will be working closely
with BriaCell’s scientific and product development teams to ensure timely production of Bria-Pros™ in compliance with applicable
regulatory requirements by the FDA.
Sales
and Marketing
Our
future commercial strategy may include the use of strategic partners, distributors, a contract sale force, or the establishment of our
own commercial and specialty sales force, as well as similar strategies for regions and territories outside the United States. We plan
to further evaluate these alternatives as we approach approval for the use of our product candidates for one or more indications.
Property,
Plant and Equipment
The
Company does not own any real property. BriaCell’s corporate offices in Canada are located at Suite 300, Bellevue Centre, 235-15th
Street, West Vancouver, BC V7T 2XI, and its corporate and research offices in the United States are located at 2929 Arch Street 3 rd Floor,
Philadelphia, PA 19104 .
We
consider our current office space sufficient to meet our anticipated needs for the foreseeable future and suitable for the conduct of
our business.
Government
Regulation
The
FDA and other regulatory authorities at federal, state, and local levels, as well as in foreign countries, extensively regulate, among
other things, the research, development, testing, manufacture, quality control, import, export, safety, effectiveness, labeling, packaging,
storage, distribution, record keeping, approval, advertising, promotion, marketing, post-approval monitoring, and post-approval reporting
of biologics such as those we are developing. Along with third-party contractors, we will be required to navigate the various preclinical,
clinical and commercial approval requirements of the governing regulatory agencies of the countries in which we wish to conduct studies
or seek approval or licensure of our current or future product candidates. The process of obtaining regulatory approvals and the subsequent
compliance with appropriate federal, state, local, and foreign statutes and regulations require the expenditure of substantial time and
financial resources. A company can make only those claims relating to safety and efficacy, purity and potency that are approved by the
FDA and in accordance with the provisions of the approved label.
29
The
process required by the FDA before biologic product candidates may be marketed in the United States generally involves the following:
●
completion
of preclinical laboratory tests and animal studies performed in accordance with the FDA’s current Good Laboratory Practices
(“ GLP ”) regulations;
●
submission
to the FDA of an Investigational New Drug Application (“ IND ”), which must become effective before clinical trials
may begin and must be updated annually or when significant changes are made;
●
approval
by an independent Institutional Review Board (“ IRB ”) or ethics committee at each clinical site before the trial
is begun;
●
performance
of adequate and well-controlled human clinical trials to establish the safety, purity and potency of the proposed biologic product
candidate for its intended purpose;
●
preparation
of and submission to the FDA of a Biologics License Application (“ BLA ”), after completion of all pivotal clinical
trials;
●
satisfactory
completion of an FDA Advisory Committee review, if applicable;
●
a determination
by the FDA within 60 days of its receipt of a BLA to file the application for review;
●
satisfactory
completion of an FDA pre-approval inspection of the manufacturing facility or facilities at which the proposed product is produced
to assess compliance with cGMP, and to assure that the facilities, methods and controls are adequate to preserve the biological product’s
continued safety, purity and potency, and of selected clinical investigations to assess compliance with current Good Clinical Practices
(“ GCP ”); and
●
FDA review
and approval of the BLA to permit commercial marketing of the product for particular indications for use in the United States, which
must be updated annually when significant changes are made.
The
testing and approval process requires substantial time, effort and financial resources, and we cannot be certain that any approvals for
our current or future product candidates will be granted on a timely basis, if at all. Prior to beginning the first clinical trial with
a product candidate, we must submit an IND to the FDA. An IND is a request for authorization from the FDA to administer an investigational
new drug to humans. The central focus of an IND submission is on the general investigational plan and the protocol(s) for clinical studies.
The IND also includes results of animal and in vitro studies assessing the toxicology, pharmacokinetics, pharmacology, and pharmacodynamic
characteristics of the product; chemistry, manufacturing, and controls information; and any available human data or literature to support
the use of the investigational product. An IND must become effective before human clinical trials may begin. The IND automatically becomes
effective 30 days after receipt by the FDA, unless the FDA, within the 30-day time period, raises safety concerns or questions about
the proposed clinical trial. In such a case, the IND may be placed on clinical hold and the IND sponsor and the FDA must resolve any
outstanding concerns or questions before the clinical trial can begin. Submission of an IND therefore may or may not result in FDA authorization
to begin a clinical trial.
30
Clinical
trials involve the administration of the investigational product to human subjects under the supervision of qualified investigators in
accordance with GCP, which include the requirement that all research subjects provide their informed consent for their participation
in any clinical trial. Clinical trials are conducted under protocols detailing, among other things, the objectives of the clinical trial,
the parameters to be used in monitoring safety and the effectiveness criteria to be evaluated. A separate submission to the existing
IND must be made for each successive clinical trial conducted during product development and for any subsequent protocol amendments.
Furthermore, an IRB for each site proposing to conduct the clinical trial must review and approve the plan for any clinical trial and
its informed consent form before the clinical trial begins at that site and must monitor the clinical trial until completed. Regulatory
authorities, the IRB or the sponsor may suspend a clinical trial at any time on various grounds, including a finding that the subjects
are being exposed to an unacceptable health risk or that the trial is unlikely to meet its stated objectives. Some studies also include
oversight by a Data & Safety Monitoring Board (“ DSMB ”) organized by the clinical trial sponsor, which provides
authorization for whether or not a clinical trial may move forward at designated check points based on access to certain data from the
clinical trial, and may halt the clinical trial if it determines that there is an unacceptable safety risk for subjects, or based on
other grounds, such as no demonstration of efficacy. There are also requirements governing the reporting of ongoing clinical studies
and clinical trial results to public registries.
For
purposes of BLA approval, human clinical trials are typically conducted in three sequential phases that may overlap.
●
Phase
1 -The investigational product is initially introduced into healthy human subjects or patients with the target disease or condition.
These studies are designed to test the safety, dosage tolerance, absorption, metabolism and distribution of the investigational product
in humans, the side effects associated with increasing doses, and, if possible, to gain early evidence on effectiveness.
●
Phase
2 -The investigational product is administered to a limited patient population with a specified disease or condition to evaluate
the preliminary efficacy, optimal dosages and dosing schedule and to identify possible adverse side effects and safety risks. Multiple
Phase 2 clinical trials may be conducted to obtain information prior to beginning larger and more expensive Phase 3 clinical trials.
In some cases, FDA will grant preliminary marketing authorization for drugs treating areas of high unmet medical need based on Phase
2 clinical trials. If granted, they will also require confirmatory Phase 3 evaluation post-marketing. BriaCell is evaluating Bria-IMT
in patients with breast cancer who have failed at least two prior lines of therapy. In this population there is no approved therapy.
Therefore, the development plan for Bria-IMT is an area of high unmet medical need. It is anticipated that BriaCell will not need
to complete Phase 3 clinical trials prior to submitting the marketing application for Bria-IMT in patients with advanced breast cancer
who have failed at least two prior lines of therapy. In this case, a confirmatory Phase 3 evaluation post-marketing will be required.
It is anticipated that this would consist of a randomized, controlled clinical trial of Bria-IMT in combination with immune checkpoint
inhibitors compared with best available therapy. However, this design is subject to negotiation with the FDA.
●
Phase
3 -The investigational product is administered to an expanded patient population to further evaluate dosage, to provide statistically
significant evidence of clinical efficacy and to further test for safety, generally at multiple geographically dispersed clinical
trial sites. These clinical trials are intended to establish the overall risk/benefit ratio of the investigational product and to
provide an adequate basis for product approval.
●
Phase
4 -In some cases, the FDA may require, or companies may voluntarily pursue, additional clinical trials after a product is approved
to gain more information about the product. These so-called Phase 4 studies may be made a condition to approval of the BLA.
Phase
1, Phase 2 and Phase 3 testing may not be completed successfully within a specified period, if at all, and there can be no assurance
that the data collected will support FDA approval or licensure of the product. Concurrent with clinical trials, companies may complete
additional animal studies and develop additional information about the biological characteristics of the product candidate and must finalize
a process for manufacturing the product in commercial quantities in accordance with cGMP requirements. The manufacturing process must
be capable of consistently producing quality batches of the product candidate and, among other things, must develop methods for testing
the identity, strength, quality and purity of the final product, or for biologics, the safety, purity and potency. Additionally, appropriate
packaging must be selected and tested and stability studies must be conducted to demonstrate that the product candidate does not undergo
unacceptable deterioration over its shelf life.
31
BLA
Submission and Review by the FDA
Assuming
successful completion of all required testing in accordance with all applicable regulatory requirements, the results of product development,
nonclinical studies and clinical trials are submitted to the FDA as part of a BLA requesting approval to market the product for one or
more indications. The BLA must include all relevant data available from pertinent preclinical and clinical studies, including negative
or ambiguous results as well as positive findings, together with detailed information relating to the product’s chemistry, manufacturing,
controls, and proposed labeling, among other things. Data can come from company-sponsored clinical studies intended to test the safety
and effectiveness of a use of the product, or from a number of alternative sources, including studies initiated by investigators. The
submission of a BLA requires payment of a substantial user fee to FDA, and the sponsor of an approved BLA is also subject to annual product
and establishment user fees. These fees are typically increased annually. A waiver of user fees may be obtained under certain limited
circumstances.
Once
a BLA has been submitted, the FDA’s goal is to review the application within ten months after it accepts the application for filing,
or, if the application relates to an unmet medical need in a serious or life-threatening indication, six months after the FDA accepts
the application for filing. The review process is often significantly extended by FDA requests for additional information or clarification.
The FDA reviews a BLA to determine, among other things, whether a product is safe, pure and potent and whether the facility in which
it is manufactured, processed, packed, or held meets standards designed to assure the product’s continued safety, purity and potency.
The FDA may convene an advisory committee to provide clinical insight on application review questions. Before approving a BLA, the FDA
will typically inspect the facility or facilities where the product is manufactured. The FDA will not approve an application unless it
determines that the manufacturing processes and facilities are in compliance with cGMP requirements and adequate to assure consistent
production of the product within required specifications. Additionally, before approving a BLA, the FDA will typically inspect one or
more clinical sites to assure compliance with GCP. If the FDA determines that the application, manufacturing process or manufacturing
facilities are not acceptable, it will outline the deficiencies in the submission and often will request additional testing or information.
Notwithstanding the submission of any requested additional information, the FDA ultimately may decide that the application does not satisfy
the regulatory criteria for approval.
The
testing and approval process requires substantial time, effort and financial resources, and each may take several years to complete.
The FDA may not grant approval on a timely basis, or at all, and we may encounter difficulties or unanticipated costs in our efforts
to secure necessary governmental approvals, which could delay or preclude us from marketing our products. After the FDA evaluates a BLA
and conducts inspections of manufacturing facilities where the investigational product and/or drug substance will be produced, the FDA
may issue an approval letter or a Complete Response Letter. An approval letter authorizes commercial marketing of the product with specific
prescribing information for specific indications. A Complete Response Letter indicates that the review cycle of the application is complete
and the application is not ready for approval. A Complete Response Letter may request additional information or clarification. The FDA
may delay or refuse approval of a BLA if applicable regulatory criteria are not satisfied, require additional testing or information
and/or require post-marketing testing and surveillance to monitor safety or efficacy of a product.
If
regulatory approval of a product is granted, such approval may entail limitations on the indicated uses for which such product may be
marketed. For example, the FDA may approve the BLA with a Risk Evaluation and Mitigation Strategy plan to mitigate risks, which could
include medication guides, physician communication plans, or elements to assure safe use, such as restricted distribution methods, patient
registries and other risk minimization tools. The FDA also may condition approval on, among other things, changes to proposed labeling
or the development of adequate controls and specifications. Once approved, the FDA may withdraw the product approval if compliance with
pre- and post-marketing regulatory standards is not maintained or if problems occur after the product reaches the marketplace. The FDA
may require one or more Phase 4 post-market studies and surveillance to further assess and monitor the product’s safety and effectiveness
after commercialization and may limit further marketing of the product based on the results of these post-marketing studies. In addition,
new government requirements, including those resulting from new legislation, may be established, or the FDA’s policies may change,
which could delay or prevent regulatory approval of our products under development.
32
A
sponsor may seek approval of its product candidate under programs designed to accelerate FDA’s review and approval of new drugs
and biological products that meet certain criteria. Specifically, new drugs and biological products are eligible for Fast Track designation
if they are intended to treat a serious or life-threatening condition and demonstrate the potential to address unmet medical needs for
the condition. For a product candidate with Fast Track designation, the FDA may consider sections of the BLA for review on a rolling
basis before the complete application is submitted if relevant criteria are met. A Fast Track designated product candidate may also qualify
for priority review, under which the FDA sets the target date for FDA action on the BLA at six months after the FDA accepts the application
for filing. Priority review is granted when there is evidence that the proposed product would be a significant improvement in the safety
or effectiveness of the treatment, diagnosis, or prevention of a serious condition. If criteria are not met for priority review, the
application is subject to the standard FDA review period of 10 months after FDA accepts the application for filing. Priority review designation
does not change the scientific/medical standard for approval or the quality of evidence necessary to support approval.
Under
the Accelerated Approval program, the FDA may approve a BLA on the basis of either a surrogate endpoint that is reasonably likely to
predict clinical benefit, or a clinical endpoint that can be measured earlier than irreversible morbidity or mortality and that is reasonably
likely to predict an effect on irreversible morbidity or mortality or other clinical benefit, taking into account the severity, rarity,
or prevalence of the condition and the availability or lack of alternative treatments. Post-marketing studies or completion of ongoing
studies after marketing approval are generally required to verify the biologic’s clinical benefit in relationship to the surrogate
endpoint or ultimate outcome in relationship to the clinical benefit.
In
addition, a sponsor may seek FDA designation of its product candidate as a Breakthrough Therapy, if the product candidate is intended,
alone or in combination with one or more other drugs or biologics, to treat a serious or life-threatening disease or condition and preliminary
clinical evidence indicates that the therapy may demonstrate substantial improvement over existing therapies on one or more clinically
significant endpoints, such as substantial treatment effects observed early in clinical development. If the FDA designates a breakthrough
therapy, it may take actions appropriate to expedite the development and review of the application. Breakthrough designation also allows
the sponsor to file sections of the BLA for review on a rolling basis.
Fast
Track, Priority Review and Breakthrough Therapy designations do not change the standards for approval but may expedite the development
or approval process.
Other
Healthcare Laws and Compliance Requirements
Our
sales, promotion, medical education and other activities following product approval will be subject to regulation by numerous regulatory
and law enforcement authorities in the United States in addition to the FDA, including potentially the Federal Trade Commission, the
Department of Justice, the Centers for Medicare and Medicaid Services, other divisions of the Department of Health and Human Services,
and state and local governments. Our promotional and scientific/educational programs must comply with the federal Anti-Kickback Statute,
the Foreign Corrupt Practices Act, the False Claims Act (“ FCA ”), the Veterans Health Care Act, physician payment transparency
laws, privacy laws, security laws, and additional state laws similar to the foregoing.
The
federal Anti-Kickback Statute prohibits, among other things, the offer, receipt, or payment of remuneration in exchange for or to induce
the referral of patients or the use of products or services that would be paid for in whole or part by Medicare, Medicaid or other federal
health care programs. Remuneration has been broadly defined to include anything of value, including cash, improper discounts, and free
or reduced price items and services. The government has enforced the Anti-Kickback Statute to reach large settlements with healthcare
companies based on sham research or consulting and other financial arrangements with physicians. Further, a person or entity does not
need to have actual knowledge of the statute or specific intent to violate it to have committed a violation. In addition, the government
may assert that a claim including items or services resulting from a violation of the federal Anti-Kickback Statute constitutes a false
or fraudulent claim for purposes of the FCA. Many states have similar laws that apply to their state health care programs as well as
private payors.
33
The
FCA imposes liability on persons who, among other things, present or cause to be presented false or fraudulent claims for payment by
a federal health care program. The FCA has been used to prosecute persons submitting claims for payment that are inaccurate or fraudulent,
that are for services not provided as claimed, or for services that are not medically necessary. Actions under the FCA may be brought
by the Attorney General or as a qui tam action by a private individual in the name of the government. Violations of the FCA can result
in significant monetary penalties and treble damages. For example, the federal government is using the FCA, and the accompanying threat
of significant liability, in its investigation and prosecution of pharmaceutical and biotechnology companies throughout the country,
in connection with the promotion of products for unapproved uses and other sales and marketing practices. The government has obtained
multi-million and multibillion dollar settlements under the FCA in addition to individual criminal convictions under applicable criminal
statutes. In addition, companies have been forced to implement extensive corrective action plans, and have often become subject to consent
decrees or corporate integrity agreements, restricting the manner in which they conduct their business. The federal Health Insurance
Portability and Accountability Act of 1996 (“ HIPAA ”) also created federal criminal statutes that prohibit, among other
things, knowingly and willfully executing a scheme to defraud any healthcare benefit program, including private third-party payors and
knowingly and willfully falsifying, concealing or covering up a material fact or making any materially false, fictitious or fraudulent
statement in connection with the delivery of or payment for healthcare benefits, items or services. Given the significant size of actual
and potential settlements, it is expected that the government will continue to devote substantial resources to investigating healthcare
providers’ and manufacturers’ compliance with applicable fraud and abuse laws.
In
addition, there has been a recent trend of increased federal and state regulation of payments made to physicians and other healthcare
providers. The Patient Protection and Affordable Care Act, as amended by the Health Care and Education Reconciliation Act (collectively,
the “ Affordable Care Act ”), among other things, imposed new reporting requirements on drug manufacturers for payments
or other transfers of value made by them to physicians and teaching hospitals, as well as ownership and investment interests held by
physicians and their immediate family members. Failure to submit required information may result in civil monetary penalties . Certain
states also mandate implementation of commercial compliance programs, impose restrictions on drug manufacturer marketing practices and/or
require the tracking and reporting of gifts, compensation and other remuneration to physicians and other healthcare professionals.
We
may also be subject to data privacy and security regulation by both the federal government and the states in which we conduct our business.
HIPAA, as amended by the Health Information Technology and Clinical Health Act (“ HITECH ”) and their respective implementing
regulations, imposes specified requirements relating to the privacy, security and transmission of individually identifiable health information.
Among other things, HITECH makes HIPAA’s privacy and security standards directly applicable to “business associates,”
defined as independent contractors or agents of covered entities that create, receive, maintain or transmit protected health information
in connection with providing a service for or on behalf of a covered entity. HITECH also increases the civil and criminal penalties that
may be imposed against covered entities, business associates and possibly other persons, and gives state attorneys general new authority
to file civil actions for damages or injunctions in federal courts to enforce the federal HIPAA laws and seek attorney’s fees and
costs associated with pursuing federal civil actions. In addition, state laws govern the privacy and security of health information in
certain circumstances, many of which differ from each other in significant ways and may not have the same effect.
If
our operations are found to be in violation of any of such laws or any other governmental regulations that apply to it, we may be subject
to penalties, including, without limitation, civil and criminal penalties, damages, fines, the curtailment or restructuring of our operations,
exclusion from participation in federal and state healthcare programs and imprisonment, any of which could adversely affect our ability
to operate our business and our financial results. Also, the U.S. Foreign Corrupt Practices Act and similar worldwide anti-bribery laws
generally prohibit companies and their intermediaries from making improper payments to foreign officials for the purpose of obtaining
or retaining business. We cannot assure you that our internal control policies and procedures will protect us from reckless or negligent
acts committed by our employees, future distributors, partners, collaborators or agents. Violations of these laws, or allegations of
such violations, could result in fines, penalties or prosecution and have a negative impact on our business, results of operations and
reputation.
Coverage
and Reimbursement
Sales
of pharmaceutical products depend significantly on the availability of third-party coverage and reimbursement. Third-party payors include
government health administrative authorities, managed care providers, private health insurers and other organizations. Although we currently
believe that third-party payors will provide coverage and reimbursement for our product candidates, if approved, these third-party payors
are increasingly challenging the price and examining the cost-effectiveness of medical products and services. In addition, significant
uncertainty exists as to the reimbursement status of newly approved healthcare products. We may need to conduct expensive clinical studies
to demonstrate the comparative cost-effectiveness of our product candidates. Seeking coverage and reimbursement from third-party payors
can be time consuming and expensive. Moreover, a payor’s decision to provide coverage for a drug product does not imply that an
adequate reimbursement rate will be approved. Reimbursement may not be available or sufficient to allow us to sell our products on a
competitive and profitable basis.
34
Foreign
Regulation
In
addition to regulations in the United States, we are and will be subject, either directly or through our distribution partners, to a
variety of regulations in other jurisdictions governing, among other things, clinical trials and commercial sales and distribution of
our products, if approved.
Whether
or not we obtain FDA approval for a product, we must obtain the requisite approvals from regulatory authorities in non-U.S. countries
prior to the commencement of clinical trials or marketing of the product in those countries. Certain countries outside of the United
States have processes that require the submission of a clinical trial application much like an IND prior to the commencement of human
clinical trials. In Europe, for example, a clinical trial application (“ CTA ”) must be submitted to the competent national
health authority and to independent ethics committees in each country in which a company plans to conduct clinical trials. Once the CTA
is approved in accordance with a country’s requirements, clinical trials may proceed in that country.
The
requirements and process governing the conduct of clinical trials, product licensing, pricing and reimbursement vary from country to
country, even though there is already some degree of legal harmonization in the European Union (the “ E.U. ”) member
states resulting from the national implementation of underlying E.U. legislation. In all cases, the clinical trials are conducted in
accordance with GCP and other applicable regulatory requirements.
To
obtain regulatory approval of a new drug or medicinal product in the E.U., a sponsor must obtain approval of a marketing authorization
application. The way in which a medicinal product can be approved in the E.U. depends on the nature of the medicinal product.
The
centralized procedure results in a single marketing authorization granted by the European Commission that is valid across the E.U., as
well as in Iceland, Liechtenstein and Norway. The centralized procedure is compulsory for human drugs that are: (i) derived from biotechnology
processes, such as genetic engineering, (ii) contain a new active substance indicated for the treatment of certain diseases, such as
HIV/AIDS, cancer, diabetes, neurodegenerative diseases, autoimmune and other immune dysfunctions and viral diseases, (iii) officially
designated as “orphan drugs” and (iv) advanced-therapy medicines, such as gene-therapy, somatic cell-therapy or tissue-engineered
medicines. The centralized procedure may at the request of the applicant also be used for human drugs which do not fall within the above
mentioned categories if the human drug (a) contains a new active substance which was not authorized in the European Community; or (b)
the applicant shows that the medicinal product constitutes a significant therapeutic, scientific or technical innovation or that the
granting of authorization in the centralized procedure is in the interests of patients or animal health at the European Community level.
Under
the centralized procedure in the E.U., the maximum timeframe for the evaluation of a marketing authorization application by the EMA is
210 days (excluding clock stops, when additional written or oral information is to be provided by the applicant in response to questions
asked by the Committee for Medicinal Products for Human Use (“ CHMP ”)), with adoption of the actual marketing authorization
by the European Commission thereafter. Accelerated evaluation might be granted by the CHMP in exceptional cases, when a medicinal product
is expected to be of a major public health interest from the point of view of therapeutic innovation, defined by three cumulative criteria:
(i) the seriousness of the disease to be treated, (ii) the absence of an appropriate alternative therapeutic approach, and (iii) anticipation
of exceptional high therapeutic benefit. In this circumstance, EMA ensures that the evaluation for the opinion of the CHMP is completed
within 150 days and the opinion issued thereafter.
The
Mutual Recognition Procedure (“ MRP ”) for the approval of human drugs is an alternative approach to facilitate individual
national marketing authorizations within the E.U. The MRP may be applied for all human drugs for which the centralized procedure is not
obligatory. The MRP is applicable to the majority of conventional medicinal products, and is based on the principle of recognition of
an already existing national marketing authorization by one or more member states.
35
The
characteristic of the MRP is that the procedure builds on an already existing marketing authorization in a member state of the E.U. that
is used as reference in order to obtain marketing authorizations in other E.U. member states. In the MRP, a marketing authorization for
a drug already exists in one or more member states of the E.U. and subsequently marketing authorization applications are made in other
E.U. member states by referring to the initial marketing authorization. The member state in which the marketing authorization was first
granted will then act as the reference member state. The member states where the marketing authorization is subsequently applied for
act as concerned member states.
The
MRP is based on the principle of the mutual recognition by E.U. member states of their respective national marketing authorizations.
Based on a marketing authorization in the reference member state, the applicant may apply for marketing authorizations in other member
states. In such case, the reference member state shall update its existing assessment report about the drug in 90 days. After the assessment
is completed, copies of the report are sent to all member states, together with the approved summary of product characteristics, labeling
and package leaflet. The concerned member states then have 90 days to recognize the decision of the reference member state and the summary
of product characteristics, labeling and package leaflet. National marketing authorizations shall be granted within 30 days after acknowledgement
of the agreement.
Should
any E.U. member state refuse to recognize the marketing authorization by the reference member state, on the grounds of potential serious
risk to public health, the issue will be referred to a coordination group. Within a timeframe of 60 days, member states shall, within
the coordination group, make all efforts to reach a consensus. If this fails, the procedure is submitted to an EMA scientific committee
for arbitration. The opinion of this EMA Committee is then forwarded to the Commission, for the start of the decision-making process.
As in the centralized procedure, this process entails consulting various European Commission Directorates General and the Standing Committee
on Human Medicinal Products or Veterinary Medicinal Products, as appropriate.
For
other countries outside of the E.U., such as countries in Eastern Europe, Latin America or Asia, the requirements governing the conduct
of clinical trials, product licensing, pricing and reimbursement vary from country to country. In all cases, again, the clinical trials
are conducted in accordance with GCP and the other applicable regulatory requirements.
If
we fail to comply with applicable foreign regulatory requirements, we may be subject to, among other things, fines, suspension of clinical
trials, suspension or withdrawal of regulatory approvals, product recalls, seizure of products, operating restrictions and criminal prosecution.
Recent
Developments
BriaCell
Appoints Renowned Oncologist, Giuseppe Del Priore, MD, MPH, as Chief Medical Officer
On
February 16, 2022, the Company announced its appointment of Giuseppe Del Priore, MD, MPH, as the Company’s Chief Medical Officer
(“ CMO ”). Dr. Del Priore will oversee the clinical and regulatory aspects of BriaCell’s current and upcoming
clinical trials, including the ongoing Phase I/IIa combination study of BriaCell’s lead candidate, Bria-IMT™, with Incyte’s
checkpoint inhibitor, retifanlimab, in advanced breast cancer.
Dr.
Del Priore is a seasoned healthcare executive with over 25 years of experience in research, drug development, and clinical trials management.
Dr. Del Priore’s prior work experience includes serving as a C-Suite biotechnology executive, a National Director at the Cancer
Treatment Centers of America, and faculty at Indiana University School of Medicine, Weill Cornell Medicine, and New York University School
of Medicine. Dr. Del Priore completed his MPH degree in Biostatistics and Epidemiology at the University of Illinois Chicago School of
Public Health, his medical degree with Distinction at The State University of New York, and his BA, magna cum laude, in Philosophy, at
The City University of New York, with additional training at Memorial Sloan Kettering Cancer Center, The University of Chicago, Northwestern
University, and the University of Rochester. He has authored numerous publications, was named on several patents, and was listed as the
“Best Doctors” by the U.S. News & World Report. He regularly appears in various media outlets as a Key Opinion Leader
in oncology. His work has been reported on by CNN, NY Times, Bloomberg, NPR, and countless worldwide outlets and has earned editorial
comments from leaders at MSKCC just in the past year.
36
BriaCell
Appoints Leading Immunologist Dr. Alexander Kharazi to its Scientific Advisory Board
On
February 23, 2022, the Company announced its appointment of leading immunologist, Alexander Kharazi, M.D., Ph.D., to its Scientific Advisory
Board. Dr. Kharazi co-invented Bria-IMT™, BriaCell’s lead clinical candidate, in collaboration with Dr. Charles L. Wiseman,
BriaCell’s Founder and Principal Research Advisor. Dr. Kharazi currently serves as Chief Technology Officer at Stemedica Cell Technologies,
Inc. His experience includes roles as Chief Scientist of the Immunotherapy laboratory at St. Vincent Medical Center in Los Angeles (1998-2006)
and Chief Pathologist of a large good laboratory practice animal study at the University of California, Los Angeles (UCLA) (1991-1998)
reporting results to the U.S. Congress. Additionally, he has worked as a Research Fellow in the department of Pathology at the Tokyo
Metropolitan Institute of Gerontology in Japan from 1989 to 1991. Dr. Kharazi earned his Ph.D. in immunology and his medical degree in
internal medicine and pathology in Kiev, Ukraine. He is a named inventor on eight U.S. patents and several foreign patents. He is the
author of numerous U.S. and international publications and has been an invited speaker/chairman/panelist on several scientific meetings.
BriaCell
Adds Two Clinical Trial Sites to Accelerate Patient Enrollment
On
February 28, 2022, the Company announced it has recruited two additional clinical sites for screening and enrolling advanced breast cancer
patients in the Phase I/IIa combination study of BriaCell’s lead candidate, Bria-IMT™, with Incyte’s checkpoint inhibitor,
retifanlimab. The additional clinical sites include the following: 1) Atlantic Health System, Morristown, New Jersey, and 2) Tranquil
Clinical Research, Webster, Texas.
BriaCell
advances preparatory work for new Bria-OTS™ breast cancer clinical trial
On
April 7, 2022, the Company announced that its novel off-the-shelf (“ OTS ”) personalized immunotherapy, Bria-OTS™,
is currently being manufactured at a cGMP facility and undergoing quality control testing for the potential upcoming clinical trial for
patients with advanced breast cancer.
BriaCell
Receives FDA Fast Track Approval for Targeted Breast Cancer Immunotherapy
On
April 13, 2022, the Company announced that the FDA has granted Fast Track status to BriaCell’s lead candidate, Bria-IMT™,
for the treatment of metastatic breast cancer (i.e. breast cancer that has spread beyond the breast). The Fast Track designation will
apply to patients with metastatic breast cancer. BriaCell is developing Bria-IMT™ in combination with immune checkpoint inhibitors
in a clinical trial listed in ClinicalTrials.gov as NCT03328026. BriaCell is currently enrolling and dosing advanced breast cancer patients
in its Phase I/IIa combination study of Bria-IMT™ with Incyte’s checkpoint inhibitor, retifanlimab under corporate collaboration
with Incyte.
Initial
data on patient survival in this study was first presented at the San Antonio Breast Cancer Symposium in December 2021 and was over 12
months in spite of the patients being very heavily pre-treated having failed on average 9 prior regimens) compared with 7-10 months in
a study in 3rd line breast cancer patients (i.e. those who failed 2 prior regimens for metastatic breast cancer) 1. Other patient subsets
with possible survival benefit included those who match Bria-IMT™ at 1 or more HLA type and those with grade I (i.e. well differentiated)
or grade II (i.e. moderately differentiated) breast cancer.
BriaCell
Adds Additional Clinical Sites to Broaden Patient Access and Further Boost Enrollment
On
May 18, 2022, the Company announced that it has activated Hoag Memorial Hospital Presbyterian and re-engaged Sylvester Comprehensive
Cancer Center, part of the University of Miami Health System, as two additional clinical sites for the screening and enrollment of advanced
breast cancer patients in the Phase I/IIa combination study of BriaCell’s lead candidate, Bria-IMT™, with Incyte’s
checkpoint inhibitor, retifanlimab.
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BriaCell
Anti-Cancer Technology Published in Leading Cancer Drug Discovery Journal
On
June 24, 2022, the Company announced the publication of novel scientific data and clinical data (previously reported) on BriaCell’s
lead candidate, Bria-IMT™. The abstract of the paper was published on-line in Recent Patents on Anti-Cancer Drug Discovery, a publication
focused on research (where patents have been registered) in leading therapeutic areas, targets, and agents related to anti-cancer drug
discovery. The publication highlights BriaCell’s approach to developing novel cellular immunotherapies for cancer and the safety
and efficacy of Bria-IMT™ against advanced breast cancer in a prior clinical study through a potentially unique mechanism of action.
The full text of the article will be made available.
BriaCell
Enters Research Agreement to Identify Novel Targets for Cancer Treatment
On
June 28, 2022, the Company announced a research collaboration agreement with Harvard Medical School in support of a project led by Joan
S. Brugge, PhD, a faculty member. The project aims to discover new targets that may lead to the development of novel anti-cancer treatments.
The
research collaboration will focus on the discovery and development of novel targets to enhance tumor cell responsiveness to chemotherapy
and immunotherapies in specific cancers including lung, head and neck, cervical, and bladder cancers. The research team at Harvard Medical
School is led by Joan S. Brugge, PhD, who is the Louise Foote Pfeiffer Professor of Cell Biology and Co-Director of the Ludwig Cancer
Center.
The
Company will have the option to negotiate a license to innovations owned by Harvard University that arise under the one-year collaboration.
The research agreement was coordinated by Harvard’s Office of Technology Development.
BriaCell
Partners with Waisman Biomanufacturing to Manufacture and Supply Prostate Cancer Immunotherapy
On
July 5, 2022, the Company announced a clinical-stage biotechnology company specializing in targeted immunotherapies for cancer, has entered
a manufacturing service agreement with Waisman Biomanufacturing at the University of Wisconsin–Madison (“ Waisman ”),
to manufacture Bria-Pros™, the Company’s off-the-shelf personalized immunotherapy for prostate cancer, for anticipated use
in clinical studies. Waisman is a leading contract manufacturing organization with experience in the manufacturing of cellular therapies
for clinical trials.
Under
the terms of the agreement, Waisman will be responsible for good manufacturing practice in the manufacturing of Bria-Pros™ for
anticipated use in clinical studies. Waisman’s expert team will be working closely with the Company’s scientific and product
development teams to ensure timely production of Bria-Pros™ in compliance with applicable regulatory requirements by the FDA.
BriaCell
Secures License for a Promising Novel Anti-Cancer Agent
On
August 2, 2022, the Company secured an exclusive license from University of Maryland, Baltimore County (“ UMBC ”) to
develop and commercialize Soluble CD80 (“ sCD80 ”) as a biologic agent for the treatment of cancer. The novel technology,
originally developed by Suzanne Ostrand-Rosenberg, PhD, Faculty at UMBC, and BriaCell’s scientific advisory board member, is entitled
“Soluble CD80 as a Therapeutic to Reverse Immune Suppression in Cancer Patients” (Patent No. US 9,650,429 B2). In animal
models, sCD80 has been shown to be safe and effective in stopping the tumor growth in animal models by potentially restoring natural
anti-tumor immunity. Importantly, sCD80’s unique actions may involve both awakening and boosting the immune system to recognize
and destroy tumor cells.
Under
the terms of the agreement, BriaCell gains the worldwide rights to develop and commercialize sCD80 as a therapeutic agent for the treatment
of cancer, while UMBC holds all rights, title and interest in the inventions and the patent, except for certain rights retained by the
United States Government. BriaCell will pay 2% royalties to UMBC upon the commercialization of the product plus other development costs.
The licensing agreement was coordinated by UMBC.
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BriaCell Partners with Caris Life Sciences®
to Expand Patient Outreach and Molecular Profiling
On September 14, 2022, the Company
signed an agreement with Caris Life Sciences ® (Caris), a leading molecular science and technology company actively developing and
delivering innovative solutions to revolutionize healthcare.
Under the terms of the agreement, Caris will help
BriaCell with efficient patient identification, accelerating enrollment for its current Phase I/II clinical trial in advanced metastatic
breast cancer of certain genetically defined subgroups. The partnership between BriaCell and Caris leverages Caris’ Right-In-Time
(RIT) Clinical Trial Network, a group of over 495 oncology sites that are able to quickly identify and enroll eligible patients in biomarker-directed
clinical trials. This service offers patients and physicians access to the most cutting-edge precision medicine in development. Additionally,
through Caris’ comprehensive molecular profiling (Whole Exome and Whole Transcriptome Sequencing), Caris will perform tumor profiling
for the patients enrolled in the clinical trial.
BriaCell Announces New Clinical Trial Site to Bring
Novel Cancer Treatments to Advanced Breast Cancer Patients
On October 12, 2022, the Company
announced it has added Mayo Clinic, Jacksonville, Florida as a clinical site in the Phase I/II study of BriaCell’s lead candidate,
Bria-IMT™, with Incyte’s PD-1 inhibitor, retifanlimab, in advanced breast cancer.
BriaCell Announces Successful Completion of Phase
I Portion of Clinical Study in Advanced Breast Cancer; Randomized Phase II Efficacy Evaluation Progressing
On October 21, 2022, the Company
announced the completion of the Phase I part of the clinical trial of its lead candidate, Bria-IMT™, in combination with Incyte’s
PD-1 inhibitor, retifanlimab, in advanced breast cancer. The efficacy and survival data of the treated patients is being evaluated in
the Phase II part of the study which was recently awarded the FDA’s fast track designation. Under an FDA approved protocol, another
arm has recently been added to the Phase II study to evaluate the effects of dosing schedules for patients in the study.
The Phase I portion of the trial,
with the primary goal of assessing safety and tolerability of the combination, enrolled 12 subjects who had previously failed at least
two prior lines of therapy, characterized as a difficult-to-treat patient population. The combination treatment had a favorable safety
profile and appeared well-tolerated with no dose-limiting toxicities.
Progressing through the Phase
II part of the clinical trial, a randomized controlled design will be used to allow comparison of the effectiveness of the treatment regimens
between the two arms of the study with different dosing schedules.
BriaCell noted it is on schedule to meet with the
FDA later this year to discuss the design of a key registration study.
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