Merus announces interim clinical data for petosemtamab in r/m HNSCC, showing potential efficacy and safety. The phase 1/2 trial data, presented at ESMO Asia Congress, indicate a confirmed overall response rate of 36% with manageable safety profile. Further clinical development includes phase 3 trials in 1L and 2/3L r/m HNSCC, and phase 2 trials in mCRC, with initial data updates planned for 2025.