Merus Announces Positive Phase 2 Data for Petosemtamab in mCRC

Saturday, Oct 25, 2025 5:27 am ET1min read

Merus has announced preliminary clinical data from a phase 2 study of bispecific antibody petosemtamab in combination with standard treatment FOLFOX/FOLFIRI in first-line (1L) and second-line (2L) metastatic colorectal cancer (mCRC), as well as petosemtamab monotherapy in third-line (3L+) mCRC. The data showed a 100% response rate in 1L link-sided mCRC and a 62% response rate in 2L link- and right-sided mCRC. The study is ongoing, and updated data will be presented at the American Association for Cancer Research (AACR) annual meeting.

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