Business
BBOT Announces Late-Breaking Preclinical Data on BBO-10203, a First-in-Class RAS:PI3Kα Breaker, at the San Antonio Breast Cancer Symposium (SABCS)
Preclinical data demonstrate BBO-10203 blocks RAS-mediated activation of PI3Kα, strongly inhibits pAKT signaling in tumor cells without inducing
About this update from Bridgebio Oncology Therapeutics, Inc.
[{"type":"text","content":"Preclinical data demonstrate BBO-10203 blocks RAS-mediated activation of PI3Kα, strongly inhibits pAKT signaling in tumor cells without inducing hyperglycemia, and shows robust anti-tumor activity both as monotherapy and in combination with standard of care therapies in mutant or wild-type PIK3CA breast cancer modelsBBOT will also present a trial in progress poster on BREAKER-101, a Phase 1 clinical trial evaluating BBO-10203 in patients with locally advanced or metastatic HER2+ breast cancer, HR+/HER2- breast cancer, KRAS mutant colorectal cancer, and KRAS mutant non-small cell lung cancer with initial Phase 1 data expected in the first half of 2026 SOUTH SAN FRANCISCO, Calif., Dec. 10, 2025 (GLOBE NEWSWIRE) -- BridgeBio Oncology Therapeutics, Inc. (“BBOT”) (Nasdaq: BBOT), a clinical-stage biopharmaceutical company focused on RAS-pathway malignancies, today announced late-breaking preclinical data on BBO-10203, a first-in-class covalent small molecule RAS:PI3Kα breaker that selectively and specifically blocks the physical interaction between RAS and PI3Kα resulting in the inhibition of RAS-driven PI3Kα-AKT signaling in tumors without inducing hyperglycemia. The data is being presented today at the San Antonio Breast Cancer Symposium (SABCS). BBOT will also present a trial in progress poster on the Phase 1 BREAKER-101 trial in patients with locally advanced or metastatic HER2+ breast cancer, HR+/HER2- breast cancer, KRAS mutant colorectal cancer, and KRAS mutant non-small cell lung cancer on Friday, December 12. “PIK3CA mutations are common, particularly in HR+/HER2- and HER2+ advanced breast cancer,” said Andreas Varkaris, MD, PhD, Attending Physician and Investigator at Massachusetts General Hospital and an investigator in the BREAKER-101 study. “Historically, we have treated these patients with successive generations of PI3K inhibitors, which have their limitations. We now look forward to a new generation of inhibitors, such as BBO-10203, that can more selectively target the mutant enzyme without affecting normal cells, potentially enabling us to treat more patients. Importantly, by improving selectivity and tolerability, these next-generation agents may also allow for combinations with other targeted therapies, something that was challenging in the past due to toxicity.” “Although PI3Kα inhibitors have provided an important ...