Michael Schmidt's questions to Mersana Therapeutics (MRSN) leadership • Q2 2025
Question
Michael Schmidt of Guggenheim Securities, LLC inquired about the approximate patient split between Dose A and Dose B in the upcoming data, the planned venue for the data release, and the potential design of a Phase 3 study in TNBC, including whether it would be limited to topo-exposed patients and if it could include HER2-low patients.
Answer
President and CEO Dr. Martin Huber stated the data release venue is to be determined and did not provide a specific patient split, but assured a 'reasonable number' in both cohorts. Regarding a Phase 3 trial, he noted that most TNBC patients will be topo-exposed, making it a natural population. He highlighted the company's Fast Track designation for 'post-topo breast cancer,' which could allow for a broader population than classic TNBC, potentially including HER2-low patients in a randomized study.