Day One to Acquire Mersana Therapeutics to Advance Mission to Bring New Medicines to People of All Ages with Life-Threatening Diseases

Acquisition expands Day One’s portfolio with novel antibody-drug conjugate (ADC) emiltatug ledadotin (Emi-Le) Emi-Le has demonstrated early anti-tumor activity in an ongoing Phase 1 study for adenoid cystic carcinoma type-1 (ACC-1), a cancer with high unmet need and a lack of therapeutic options