GlobeNewswire Inc | Jun 2, 2021 07:12AM EDT

June 02, 2021

-- 12.0 months average overall survival benefit, including 13.4 months in patients with 2+ HLA matches and 12.5 months in patients with Grade I/II tumors(1) -- Top Responder: 21.4 months survival plus 100% resolution of eye-bulging orbital tumor -- Compares to 7.2-9.8 months survival in historical comparison treatment trials(2)

BERKELEY, Calif. and VANCOUVER, British Columbia, June 02, 2021 (GLOBE NEWSWIRE) -- BriaCell Therapeutics Corp. (Nasdaq: BCTX, BCTXW) (TSX-V:BCT) (BriaCell or the Company), a clinical-stage biotechnology company specializing in targeted immunotherapies for advanced breast cancer, today provides an update on the overall survival (OS) data on its previously disclosed advanced breast cancer patients. These women were treated with BriaCells lead candidate Bria-IMT as monotherapy and also in combination with checkpoint inhibitors, including pembrolizumab (KEYTRUDA; manufactured by Merck & Co., Inc.) and Incytes retifanlimab (manufactured and provided under a corporate collaboration with Incyte Corporation).

HLA-Typing Cells with HLA (human leukocyte antigen) molecules on their surface determine and trigger the bodys immune response. BriaCells immunotherapy treatment appears most effective when the patients HLA-type matches with Bria-IMT, allowing BriaCell to potentially identify patients most likely to respond. HLA-typing is a simple and widely available test.

Tumor Grade BriaCell has noted clinical benefit in its patients with grade I and grade II tumors, suggesting another subgroup of patients for whom BriaCells treatment would be most effective.

BriaCell Treatment ^1 Leading Treatment Comparison ^2N = Filter Prior Overall vs. Prior Overall Regimens Survival Regimens Survival7 Combination 9 12.0 months 2 7.2 - 9.8 Therapy months9 1+ HLA 8 12.1 months 5 2+ HLA 5 13.4 months 6 Tumor Grade I/ 12 12.5 months IIPatient 2 HLA; Grade 13 21.4 months 06-005 ^3 II

1) BriaCell treats severely sick patients, as indicated by the Prior Regimens column. To more accurately present survival data, BriaCell has included only those women able to mount an immune response. Patients from both the monotherapy and combination therapy are included unless otherwise indicated.2) Overall survival of 7.2-9.8 months in similar patients with metastatic breast cancer who have failed 2 prior therapy attempts (third line setting); Kazmi S, et al. Breast Cancer Res Treat. 2020 Aug 17.3) Remarkable Responder highlighted; included within subsets Tumor Grade I/II and 2+ HLA.

Highlighting BriaCells Top ResponderInitially announced on Sep. 19, 2019 and subsequently on Jan. 13, 2020, BriaCell has continued to emphasize this patients positive response to BriaCells treatment. Prior to BriaCells treatment, the patient had received 12 regimens with 16 agents (incl. 13 chemotherapies), yet her condition worsened and included a gruesome orbital tumor that metastasized behind her left eye and caused the eye to bulge from its socket (proptosis). After just six months of BriaCells treatment, the orbital tumor had been completely eliminated, and she survived for over 21 months, a significant clinical benefit.

Figure 1: The figure shows MRI scans of the top responder patient. The arrows on the images (baseline scans) show the location of the orbital tumors. As shown on the images on the right hand side, the tumors were eliminated following 6 months of treatment with the Bria-IMT combination regimen.

In the figure above, and with tumors indicated by white arrows, complete resolution of the orbital tumor was observed after six months on BriaCells treatment. Of note, she had two HLA matches with Bria-IMT and a grade II tumor, supporting BriaCells hypotheses outlined above.

"Women with advanced breast cancer often are fighting a deadly disease that does not respond to currently-available treatments," said Dr. Bill Williams, BriaCells President and CEO. "We are pleased to report that our immunotherapy regimen appears to offer clinical benefit for these patients in desperate need of new therapy options."

About BriaCell Therapeutics Corp.

BriaCell is an immuno-oncology focused biotechnology company developing targeted and effective approaches for the management of cancer.

For additional information on BriaCell, please visit: https://briacell.com/.

Forward Looking Statements

This press release contains forward-looking statements that are subject to substantial risks and uncertainties. All statements, other than statements of historical fact, contained in this press release are forward-looking statements. Forward-looking statements contained in this press release may be identified by the use of words such as anticipate, believe, contemplate, could, estimate, expect, intend, seek, may, might, plan, potential, predict, project, target, aim, should, "will would, or the negative of these words or other similar expressions, although not all forward-looking statements contain these words. Forward-looking statements are based on BriaCells current expectations and are subject to inherent uncertainties, risks and assumptions that are difficult to predict. Further, certain forward-looking statements are based on assumptions as to future events that may not prove to be accurate. These and other risks and uncertainties are described more fully under the heading "Risks and Uncertainties" in the Company's most recent Managements Discussion and Analysis, under Risks and Uncertainties and in the Company's other filings with the Canadian securities regulatory authorities and the U.S. Securities and Exchange Commission, all of which are available under our profiles on SEDAR at www.sedar.com and on EDGAR at www.sec.gov. . Forward-looking statements contained in this announcement are made as of this date, and BriaCell Therapeutics Corp. undertakes no duty to update such information except as required under applicable law.

Neither TSX Venture Exchange nor its Regulation Services Provider (as that term is defined in the policies of the TSX Venture Exchange) accepts responsibility for the adequacy or accuracy of this release.

Contact Information

Company Contact:William V. Williams, MD

President & CEO1-888-485-6340info@briacell.com

Media Relations:Jules AbrahamDirector of Public RelationsCORE IR917-885-7378julesa@coreir.com

Investor Relations Contact:CORE IRinvestors@briacell.com