On June 1, 2026 BriaCell Therapeutics Corp. (Nasdaq: BCTX, BCTXL) (TSX: BCT) ("BriaCell" or the "Company"), a clinical-stage biotechnology company developing novel immunotherapies to transform cancer care, reported positive clinical data from three clinical data poster presentations at the 2026 ASCO (Free ASCO Whitepaper) Annual Meeting, taking place May 29-June 2, 2026 at McCormick Place, Chicago, Illinois. The presentations will include two poster presentations featuring data from BriaCell’s ongoing pivotal Phase 3 study of Bria-IMT plus an immune checkpoint inhibitor (ClinicalTrials.gov identifier: NCT06072612) and one poster highlighting further analyses of Phase 2 data.

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"Late-stage metastatic breast cancer (MBC) is often associated with a poor prognosis and very short survival rates," stated Saranya Chumsri, MD, principal investigator in the Phase 3 study of Bria-IMT+CPI, and Professor of Oncology at Mayo Clinic Florida. "We are pleased to report Phase 2 study median overall survival rates as high as 16.6 months and a high rate of long-term survival in our late-stage MBC patients including in patients resistant to multiple prior therapies."

"BriaCell’s Phase 3 data are highly encouraging because they address one of the key challenges in treating late-stage breast cancer patients: delivering clinical benefit while limiting toxicity that can lead to voluntary treatment discontinuation," stated Adam M. Brufsky, MD, PhD, FACP, Professor of Medicine at the University of Pittsburgh School of Medicine and Medical Director of the Magee-Women’s Cancer Program.

"We are increasingly optimistic with the early quality of life and biomarker data from our ongoing pivotal Phase 3 Bria-ABC trial demonstrating sustained clinical activity in patients with advanced MBC who did not respond to multiple prior treatments," noted William V. Williams, MD, BriaCell’s President & CEO.

The details of the presentations are listed below.

Abstract Title: Survival with Bria-IMT + CPI in advanced metastatic breast cancer at 12 and 24 months.
Session Type/Title: Poster Session – Breast Cancer—Metastatic
Poster Board: 222
Date and Time: June 1, 2026, 1:30 PM-4:30 PM CDT
Clinical Data: 32 Phase 2 Bria-IMT patients were randomized to receive immune checkpoint inhibitor (CPI) in the first cycle or delayed to the second cycle. Two Bria-IMT formulations were also evaluated. Patients had median age of 61 (range 41-80) and had received median 6 prior therapies (range 2-13). Treatment was well tolerated with injection site reactions, mostly mild in severity, the most frequent side. The clinical benefit rate was 62% overall in long-term survivors. Of patients treated with the Phase 3 formulation, 10 of 21 (48%) survived over a year.

Median overall survival ("OS") was 13.3 months for patients who initiated checkpoint inhibitor ("CPI") therapy in Cycle 1 (as is being done in the Phase 3 Bria-ABC study) versus 7.4 months for those who initiated CPI therapy in Cycle 2 with estimated 12-month and 24-month OS rates being 50% and 25% for initiating CPI in the first cycle. Among patients who developed an immune response, as measured by delayed-type hypersensitivity ("DTH"), median OS was 11.9 months in DTH-positive patients versus 4.7 months in DTH-negative patients, with 48% versus 0% 12-month survival, respectively. Estimated 12-month and 24-month OS rates were 41% and 24%, respectively, for the entire Phase 2 population. For patients treated with the Phase 3 regimen, the median OS was 16.6 months with >55% OS at 1 year and >27% at 2 years (see Figure 1 below. Note that the CPI at C1 and IP w/o IFNγ is the Phase 3 Bria-IMT regimen). There were no treatment-related discontinuations and no unexpected safety signals.

Conclusions: In heavily pretreated MBC patients, Bria-IMT demonstrated an excellent safety profile and the emergence of a long-term survivor cohort. Durable survival rates were observed beyond 12 and 24 months. Differential survival favored the Phase 3 formulation, DTH positivity, lower baseline circulating tumor cell (CTC) levels, and early CPI sequencing. These findings support prospective validation of DTH and CTC as predictive biomarkers for effectiveness of the Bria-IMT regimen and the continued use of the Phase 3 formulation in the ongoing Phase 3 study Bria-ABC. The clinical findings further confirmed the preferred formulation for the ongoing pivotal Phase 3 study.

Abstract Title: Quality of life and treatment tolerability of Bria-IMT + CPI in metastatic breast cancer.
Session Type/Title: Poster Session – Breast Cancer—Metastatic
Poster Board: 221
Date and Time: June 1, 2026, 1:30 PM-4:30 PM CDT
Summary: Heavily pretreated MBC patients in the pivotal Bria-ABC study demonstrated stable global health and key functional domains. Measurements included quality of life (QOL) and time without symptoms or toxicity (TWiST). Blinded data indicated that QOL was preserved in a heavily pretreated population with prior antibody-drug conjugate (ADC), check point inhibitor (CPI), and cyclin-dependent kinase 4/6 (CDK4/6) inhibitor exposure. Clinical data demonstrates meaningful benefits without significant toxicity. Ongoing follow up will further characterize durability of patient-reported outcomes and clinical correlation. Data further supports decentralized care and potential home self-administration of the Bria-IMT+CPI regimen.

Study patients were heavily pretreated, consistent with BriaCell’s prior Phase 2 population, with a median of 6 prior systemic therapies (range: 2–14), including prior ADCs in 84%, CPIs in 27%, and CDK4/6 inhibitors in 61%. Blinded Phase 3 data suggest sustained quality of life despite advanced disease and poor prognostic characteristics. TWiST analysis demonstrated meaningful time alive without disease symptoms or significant treatment-related toxicity, supporting a favorable benefit-risk profile.

Abstract Title: Monitoring blood-based biomarkers as early predictors of progression-free survival in a randomized Bria-ABC Phase 3 trial for advanced metastatic breast cancer: An ongoing analysis.
Session Type/Title: Poster Session – Developmental Therapeutics—Immunotherapy
Poster Board: 442
Date and Time: May 30, 2026, 1:30 PM-4:30 PM CDT
Summary: In an ongoing analysis of heavily treated MBC patients, we observed that in the entire blinded population, 65% of patients had stability/drop in Cancer-Associated Macrophage-Like cells (CAMLs) and this significantly correlated with better progression free survival (PFS).

Results:

≥1 circulating tumor cells (CTC)s were found in 25% at baseline (BL) and 20% at the first on-treatment assessment(T1)
≥1 Cancer-associated macrophage-like cells (CAMLs) were found in 93% at BL & 93% at T1
≥1 CTC significantly correlated with progression free survival (PFS) at BL, but not at T1
A decrease or stable CAML counts between BL and T1 (seen in 60% of patients) significantly correlated with better progression-free survival
In this ongoing blinded analysis of heavily pretreated metastatic breast cancer patients, stable or decreased CAML counts from baseline to Cycle 3 were observed in 60% of evaluable patients and significantly correlated with improved PFS. Baseline CTC positivity was associated with more rapid progression. These findings support further evaluation of CAML dynamics as a potential early blood-based biomarker of clinical outcomes in the Phase 3 Bria-ABC study.

Following the presentation, copies of the posters will be available at View Source

(Press release, BriaCell Therapeutics, JUN 1, 2026, View Source [SID1234666352])