A Study of BRIA-OTS Cellular Immunotherapy in Metastatic Recurrent Breast Cancer

Summary

This is an open-label Phase 1/2a study. Once the safety of the BC1 cell line alone has been demonstrated in Phase 1, in Phase 2, patients will be treated with the Bria-OTS regimen (see below) and a clinically available check point inhibitor (CPI).

During the monotherapy phase of Phase 1, one patient will be treated intradermally every 2 weeks for 6 weeks (4 doses) with an initial dose of the BC1 cell line. If this dose is tolerated, the next patient will receive an increased dose of BC1. If once again tolerated, the third patient will receive a further dose increase of the BC1. Once at least 3 patients have been safely treated with the BC1 cell line, with no dose-limiting toxicity (DLT), the combinational phase of the study will commence.

Following the monotherapy phase, patients will be treated with BC1 and the Bria-OTS regimen (see below) every 3 weeks, plus a CPI at the FDA approved labelled dose and schedule. There will be at least a 2-week spacing between enrollment of each of the first three subjects in the study in order to assess for any early unanticipated risk(s).

During the Phase 1 combination and Phase 2 expansion phases, all patients will be treated with BC1 cells as part of the Bria-OTS regimen, which includes cyclophosphamide 300 mg/m2 2-3 days prior to BC1 cell inoculation, and peginterferon alpha-2a administered on the same day, following BC1 cell inoculation.

Conditions

• Breast Cancer
• Breast Tumor
• Cancer of Breast
• Cancer of the Breast
• Malignant Tumor of Breast
• Tumors, Breast

Interventions

BIOLOGICAL

BC1 cell line

BC1 cell line is a different experimental, HER-2 positive, allogeneic, whole cell BC cell lines designed to secrete GM-CSF in situ and augment dendritic cell activity. Similar to the SV-BR-1-GM cell line (NCT03328026, IND 10312), the BC cell line is derived from the BC parent cell line, SV-BR-1, which expresses multiple tumor associated antigens (TAAs)

BIOLOGICAL

Bria-OTS regimen and CPI (tislelizumab)

Biological: BC1 * BC1 inoculation intradermally at 4 sites Drug: Low dose cyclophosphamide * Pretreatment with low dose cyclophosphamide 2-3 days prior to BC1 inoculation Drug: Interferon * Subjects will receive low dose peginterferon alpha-2a on the same day as cell inoculation. Drug: Tislelizumab * CPI treatment will also be given on the same day as cell inoculation.

BIOLOGICAL

Bria-OTS regimen and CPI (tislelizumab) expansion cohort

Biological: BC1 * BC1 inoculation intradermally at 4 sites Drug: Low dose cyclophosphamide * Pretreatment with low dose cyclophosphamide 2-3 days prior to BC1 inoculation Drug: Interferon * Subjects will receive low dose peginterferon alpha-2a on the same day as cell inoculation. Drug: Tislelizumab * CPI treatment will also be given on the same day as cell inoculation.

Sponsors & Collaborators

• BriaCell Therapeutics Corporation

  lead INDUSTRY

Principal Investigators

• Giuseppe Del Priore, MD, MPH · BriaCell Therapeutics Corp

• Victoria Chua-Alcala, MD · Sarcoma Oncology Research Center

Study Design

Allocation

NON_RANDOMIZED

Purpose

TREATMENT

Masking

NONE

Model

SEQUENTIAL

Eligibility

Min Age

18 Years

Sex

ALL

Healthy Volunteers

No

Timeline & Regulatory

Start

2024-05-29

Primary Completion

2025-04-30

Completion

2025-10-30

FDA Drug

Yes

Countries

• United States

Study Locations