BOLD News & Events

Boundless Bio presents preclinical data supporting its lead ecDNA-directed therapy, BBI-940, at the American Association for Cancer Research Annual Meeting 2026. Boundless has identified a novel kinesin target essential to ecDNA segregation and inheritance in cancer cells, but non-essential in healthy cells. BBI-940, a potentially first-in-class, oral, and selective Kinesin degrader, is currently being evaluated in the Phase 1 KOMODO-1 trial in patients with advanced or metastatic ER+/HER2- breast cancer and TNBC-LAR. "Extrachromosomal DNA is well established as a distinct enabler of chromosomal instability associated with oncogene amplification, therapeutic resistance, and poor outcomes for patients," said Chris Hassig, Chief Scientific Officer. "We have discovered and validated a novel kinesin target that plays a critical role in ecDNA segregation during cell division, thereby affording tumors with a high degree of genomic plasticity. Our data demonstrate that selective degradation of this target delivered potent antitumor activity in validated breast cancer models, particularly those with ecDNA. Our genetic, in vitro, in vivo, and toxicity profile of BBI-940 supports our recently initiated, first-in-human KOMODO-1 clinical trial evaluating BBI-940 in ER+/HER2- and TNBC-LAR breast cancer patients."

"With the KOMODO-1 trial of BBI-940 actively enrolling, we are excited to evaluate this potentially first-in-class oral Kinesin degrader in patients with breast cancer who are seeking new treatment options. BBI-940 is designed to disrupt ecDNA segregation and inheritance, a differentiated mechanism for targeting chromosomally unstable cancers. The Boundless team is focused on clinical execution and reaching an initial proof-of-concept readout within our existing cash runway," said Zachary Hornby, President and Chief Executive Officer of Boundless Bio.

Cash, cash equivalents, and short-term investments totaled $107.6 million as of December 31, 2025. The Company expects its cash to fund operations into the second half of 2028, through the anticipated initial clinical proof-of-concept readout from KOMODO-1.

Following a strategic portfolio review, Boundless Bio has elected to cease enrollment of the Phase 1/2 Potentiate trial evaluating the combination of BBI-355, its oral, selective CHK1 inhibitor and BBI-825, its oral, selective RNR inhibitor, in oncogene-amplified cancers. "This decision reflects market considerations, clinical data, and the Company's prioritization of programs with the greatest potential to deliver meaningful clinical impact and long-term value," the company said.