SV BR 1 GM cancer vaccine ( BriaCell Therapeutics)

Preclinical data shows that BriaCell’s Bria-OTS+™ and Bria-PROS+™ effectively induce an anti-cancer immune response via multiple mechanisms including naïve helper and killer T cells, dendritic cells, and natural killer (NK) cells The novel mechanisms of action may lead to strong anti-cancer activity in breast and prostate cancer patients PHILADELPHIA and VANCOUVER, British Columbia, April 10, 2024 (GLOBE NEWSWIRE) -- BriaCell Therapeutics Corp. (Nasdaq: BCTX, BCTXW) (TSX: BCT) (“BriaCell” or the “Company”), a clinical-stage biotechnology company that develops novel immunotherapies to transform cancer care, today is pleased to report preclinical data showing strong anti-cancer activity of its next generation, personalized, off-the-shelf, cell-based breast and prostate cancer immunotherapies, Bria-OTS+™ and Bria-PROS+™, in a poster session during the 2024 American Association for Cancer Research (AACR) Annual Meeting held from April 5-10 at San Diego Convention Center, San Diego, CA. “Our data demonstrates enhancement of immune responses and expanded mechanisms of action of the Bria-OTS+™ platform,” commented Miguel A. Lopez-Lago, PhD, BriaCell’s Chief Scientific Officer. “We anticipate that our novel immunotherapeutic platform will provide potent and long-lasting anti-cancer activity in cancer patients. We view our technology as a significant scientific advancement in the field of oncology and personalized immunotherapy.” “We are truly thrilled with our data confirming the robust immune system activation elicited by our novel next generation Bria-OTS+™ platform – featuring proprietary immune activating factors for improved efficacy,” commented Dr. William V. Williams, BriaCell’s President and CEO. “We have successfully enhanced antigen presentation activity and cytokine expression while expanding our HLA target range to cover nearly 99% of the population. We are looking forward to advancing our next generation Bria-OTS+™ and Bria-PROS+™ programs into the clinic.” The poster is summarized below and linked here: . Title: Bria-OTS+™ immunotherapy platform: Harnessing gene-modified tumor cells to reinvigorate the cancer immunity cycle for precision anti-tumor responses Abstract Presentation Number: 6753 BriaCell has designed Bria-OTS+™, an immunotherapy platform representing the next generation (enhanced version) of Bria-OTS™, BriaCell’s personalized off-the-shelf (i.e. pre-manufactured and ready for use) immunotherapy for cancer. Bria-OTS+™ immunotherapy expresses multiple immune activating cytokines and co-stimulatory molecules in addition to immune boosting granulocyte-macrophage colony-stimulating factor (GM-CSF). BriaCell expects to use Bria-OTS+™ and Bria-PROS+™ in its upcoming phase 1/2a clinical studies for breast and prostate cancer, respectively. Bria-PROS+™ has already entered GMP manufacturing to generate clinical supplies for the phase 1/2a study. The characteristics of the next generation Bria-OTS+™ immunotherapy platform include the following: Bria-OTS+™ and Bria-PROS+™ activate key components of the innate immune system which serves as the body’s first line of defense against cancer Bria-OTS+™ and Bria-PROS+™ engage multiple facets of the adaptive immune response. This may result in lasting anti-cancer effects in patients Specifically activates Natural Killer (NK) cells to counter cancer immune escape caused by the loss of human leukocyte antigens (HLA) Designed for personalized and ready-to-use therapy with long term stability Simplified administration process of intradermal inoculations (injection into the skin) allows administration in a physician’s office Anticipated to have a favorable side effect profile, indicating good tolerance (based on prior findings with Bria-IMT™) Given ease of administration, potent, multi-faceted immune system activation, and favorable safety profile, BriaCell expects Bria-OTS+™ and Bria-PROS+™ to deliver significant clinical efficacy and survival benefits in breast cancer and prostate cancer, respectively. About BriaCell Therapeutics Corp. BriaCell is a clinical-stage biotechnology company that develops novel immunotherapies to transform cancer care. More information is available at . Safe Harbor 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, including those about presenting a poster at the 2024 AACR, and the contents of such poster; preclinical data showing strong anti-cancer activity of its next generation, personalized, off-the-shelf, cell-based breast and prostate cancer immunotherapies, Bria-OTS+™ and Bria-PROS+™; BriaCell data demonstrating enhancement of immune responses and expanded mechanisms of action of the Bria-OTS+™ platform; BriaCell’s novel immunotherapeutic platform providing potent and long-lasting anti-cancer activity in cancer patients and BriaCell’s technology being a significant scientific advancement in the field of oncology and personalized immunotherapy; BriaCell’s data confirming the robust immune system activation elicited by their novel next generation Bria-OTS+™ platform, featuring proprietary immune activating factors for improved efficacy; Bria-OTS+™’s enhanced antigen presentation activity and cytokine expression and expanded HLA target range covering nearly 99% of the population; BriaCell advancing its next generation Bria-OTS+™ and Bria-PROS+™ programs into the clinic; BriaCell using Bria-OTS+™ and Bria-PROS+™ in its upcoming phase 1/2a clinical studies for breast and prostate cancer; the characteristics of the Bria-OTS+™ immunotherapy platform; Bria-OTS+™ and Bria-PROS+™ having a favorable side effect profile; and the ability of Bria-OTS+™ and Bria-PROS+™ to deliver significant clinical efficacy and survival benefits in breast cancer and prostate cancer, respectively, are based on BriaCell’s 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 Management’s Discussion and Analysis, under the heading "Risk Factors" in the Company's most recent Annual Information Form, and under “Risks and Uncertainties” 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 the Company's profiles on SEDAR+ at and on EDGAR at . 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 the Toronto Stock Exchange nor its Regulation Services Provider (as that term is defined in the policies of the Toronto Stock Exchange) accepts responsibility for the adequacy or accuracy of this release. Contact Information Company Contact: William V. Williams, MD President & CEO 1-888-485-6340 info@briacell.com Media Relations: Jules Abraham CORE IR julesa@coreir.com Investor Relations Contact: CORE IR investors@briacell.com

PFS of 4.2 months in Phase 2 ADC resistant patients receiving Bria-IMT™ pivotal Phase 3 formulation is twice that of controls in similar studies PFS results reinforced by larger number of prior treatments in Bria-IMT™ population than in comparable studies Bria-IMT™ PFS compares favorably to their most recent treatment PFS in 48% of patients Clinical benefit rate of 56% in evaluable patients71% intracranial objective response rate (iORR) in heavily pretreated patientsFindings support clinical efficacy of Bria-IMT™ and highlight its significant potential in managing CNS metastatic disease in advanced breast cancerAdditional preclinical anti-cancer data of Bria-OTS+™ and Bria-PROS+™ will be presented tomorrow 9:00 AM - 12:30 PM PST; Abstract Presentation Number: 6753 PHILADELPHIA and VANCOUVER, British Columbia, April 09, 2024 (GLOBE NEWSWIRE) -- BriaCell Therapeutics Corp. (Nasdaq: BCTX, BCTXW) (TSX: BCT) (“BriaCell” or the “Company”), a clinical-stage biotechnology company that develops novel immunotherapies to transform cancer care, is presenting positive clinical data from its lead product candidate, Bria-IMT™, in two posters of its three poster sessions during the 2024 American Association for Cancer Research (AACR) Annual Meeting held from April 5-10 at San Diego Convention Center, San Diego, CA. “We are extremely impressed by the unprecedented survival and clinical benefit data for Bria-IMT™ in patients who have failed ADCs,” stated lead author Chaitali S. Nangia, MD, Partner at Hoag Medical Group. “ADCs are the latest treatments for very difficult-to-treat advanced metastatic breast cancer. However, some patients experience resistance with rapid disease progression. To our knowledge, there are no effective treatment options in this patient population for whom the progression-free survival prognosis is only a few weeks. Finding an alternative well-tolerated treatment option that is effective is a matter of life and death for these patients.” “Our clinical data further validates Bria-IMT™’s novel mechanism of action to generate potent immune responses in breast cancer patients who failed ADCs leading to clinically relevant survival and treatment benefit in these patients,” commented Dr. Giuseppe Del Priore, BriaCell’s CMO. “We look forward to building upon the body of evidence with additional clinical data in the coming months from the ongoing pivotal registration trial.” “We are excited about the safety and efficacy data to date with Bria-IMT™ and expect that Bria-IMT™ will generate positive effects on survival and clinical benefit in the Phase 3 study in advanced breast cancer patients whose medical needs remain unmet,” commented Dr. William V. Williams, BriaCell’s President and CEO. The posters are summarized below and linked here: https://briacell.com/scientific-publications/. Poster 1 – Title: Efficacy of Bria-IMT™ regimen in inducing CNS metastasis regressionAbstract Presentation Number: CT204 Superior clinical benefit of Bria-IMT™ regimen - alone or combined with an immune check point inhibitor (CPI) in advanced breast cancer patients with CNS metastatic disease Clinical efficacy: 71% (5/7) intracranial objective response rate (iORR), defined as the percentage of patients who achieve a complete response (complete disappearance) or partial response (volume reduction of 30% or more) in intracranial tumors, achieved in patients with central nervous system (CNS) metastases treated with the Bria-IMT™ regimen, either alone or in combination with an immune checkpoint inhibitor (i.e. PD-1 inhibitor pembrolizumab or retifanlimab). These patients failed multiple prior treatments including 2 antibody-drug conjugates in one case. Clinical benefit is observed across all subsets of breast cancer.Safety profile: Absence of both interstitial lung disease (ILD), a common serious adverse event with ADCs, and no Bria-IMT™-related treatment discontinuations underscore Bria-IMT™'s excellent tolerability and favorable safety profile. In summary, Bria-IMT™’s tumor reductions observed in all breast cancer subtypes in patients with intracranial disease underlines its potential clinical effectiveness in managing CNS metastatic disease in advanced breast cancer. BriaCell will continue to monitor the data in this subgroup of patients including a pre-planned subgroup analysis in the current pivotal Phase 3 study in advanced metastatic breast cancer. Treatment of patients with CNS metastatic disease represents a potential additional indication for market approval of Bria-IMT™. Poster 2 – Title: Efficacy and safety of SV-BR-1-GM after progression on ADC in metastatic breast cancer patientsAbstract Presentation Number: CT206 Notable progression-free survival benefit of Bria-IMT™ in ADC resistant advanced metastatic breast cancer Phase 2 clinical data of the Bria-IMT™ regimen in 23 advanced metastatic breast cancer patients who failed multiple prior treatments including ADCs and CPIs (median of 6 prior treatments) are presented. Progression-free Survival Benefit: Median progression free survival (PFS), defined as the length of time during which a patient’s cancer does not get worse, in heavily pre-treated patients of 3.5 months is comparable to that seen in similar studies in patients with a history of fewer prior treatments (median of 4)1,2. Similarly, median PFS of 4.2 months in patients receiving the Bria-IMT™ pivotal phase 3 formulation is approximately twice the PFS figures reported for treatment of physician’s choice (TPC) in other similar studies. These PFS results suggest superior clinical efficacy considering the larger number of prior treatments in Bria-IMT™ patients vs those of the other studies.Clinical efficacy: PFS is similar or better than that of the last regimen in 48% (11/23) of the patients suggesting Bria-IMT™ effectiveness in delivering clinical and survival benefits in these patients. Additionally, a clinical benefit rate (CBR), defined as percentage of patients whose disease shrinks or remains stable over a certain time, of 56% is observed in evaluable patients further highlighting clinical benefit.Subset specific clinical benefits: Study data to date suggests clinical benefit for multiple breast cancer subtypes including HR+/HER2- (the most common breast cancer subtype, testing positive for estrogen and/or progesterone receptors and negative for human epidermal growth factor receptor 2 or HER2) with a CBR following treatment, of 63% (5 of 8 patients); HER2+ subtype (a positive test for HER2) with a 100% CBR (2 of 2 patients) and HR-/HER2 low subtype (a negative test for estrogen and/or progesterone receptor and a negative test for HER2) showing a CBR of 66% (2 of 3 patients).Safety profile: There are no incidents of interstitial lung disease - a well-documented serious adverse event associated with ADCs, - in either ADC naïve or ADC treated patients, and no treatment-related discontinuations of Bria-IMT™. In summary, the data to date shows that Bria-IMT™ provides prolonged progression-free survival and clinical benefits in heavily pre-treated, ADC resistant breast cancer patients compared with those in other similar studies. BriaCell will be monitoring ADC resistant patients in its ongoing pivotal Phase 3 study of Bria-IMT™ and CPI in advanced metastatic breast cancer. ________________________1 Cortes J et al. Eribulin monotherapy versus treatment of physician’s choice in patients with metastatic breast cancer (EMBRACE): a phase 3 open-label randomized study. Lancet (2011) 377: 914–232 Bardia A et al. Final results from the randomized phase III ASCENT clinical trial in metastatic triple-negative breast cancer and association of outcomes by human epidermal growth factor receptor 2 and trophoblast cell surface antigen 2 expression. J Clin Oncol (2024) 00:1-7 About BriaCell Therapeutics Corp. BriaCell is a clinical-stage biotechnology company that develops novel immunotherapies to transform cancer care. More information is available at https://briacell.com/. Safe Harbor 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, including those about presenting three posters at the 2024 AACR, and the contents of such posters; the positive clinical data from BriaCell’s Bria-IMT™ being presented in two posters during the 2024 AACR; the clinical efficacy of Bria-IMT™ and its potential clinical effectiveness in managing CNS metastatic disease in advanced breast cancer; the unprecedented survival and clinical benefit data for Bria-IMT™; Bria-IMT™’s ability to generate potent immune responses in breast cancer patients who failed ADCs, leading to clinically relevant survival and treatment benefit; BriaCell’s ability to build upon their current body of evidence with additional clinical data in the coming months from the ongoing registration trial; Bria-IMT™’s ability to generate positive effects on survival and clinical benefit in the Phase 3 study in advanced breast cancer patients; Bria-IMT™'s tolerability and favorable safety profile; Bria-IMT™'s significant potential in managing CNS metastatic disease in advanced breast cancer; BriaCell monitoring the data in a subgroup of patients including a pre-planned subgroup analysis in the current pivotal Phase 3 study in advanced metastatic breast cancer; the treatment of patients with CNS metastatic disease representing a potential additional indication for market approval of Bria-IMT™; Bria-IMT™’s effectiveness in delivering clinical and survival benefits in patients; the Bria-IMT™ data representing a clinical benefit for multiple breast cancer subtypes including HR+/HER2; and BriaCell’s monitoring of ADC resistant patients in their ongoing pivotal Phase 3 study of Bria-IMT™ and CPI in advanced metastatic breast cancer, are based on BriaCell’s 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 Management’s Discussion and Analysis, under the heading "Risk Factors" in the Company's most recent Annual Information Form, and under “Risks and Uncertainties” 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 the Company's profiles on SEDAR+ at www.sedarplus.ca 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 the Toronto Stock Exchange nor its Regulation Services Provider (as that term is defined in the policies of the Toronto Stock Exchange) accepts responsibility for the adequacy or accuracy of this release. Contact Information Company Contact:William V. Williams, MDPresident & CEO1-888-485-6340info@briacell.com Media Relations:Jules AbrahamCORE IRjulesa@coreir.com Investor Relations Contact:CORE IRinvestors@briacell.com