Mersana Therapeutics(MRSN) GlobeNewswire·2025-05-15 13:20Core Insights - Mersana Therapeutics, Inc. provided a business update and reported financial results for Q1 2025, focusing on the development of its antibody-drug conjugates (ADCs) targeting cancers with high unmet medical needs [2][15]. Business Update - The company is advancing the development of Emi-Le, a B7-H4-directed Dolasynthen ADC, with promising preliminary data presented at ESMO Breast Cancer 2025 [3][4]. - Encouraging clinical activity data showed an objective response rate (ORR) of 31% among evaluable patients with B7-H4 high tumors receiving intermediate doses of Emi-Le, an increase from 23% previously reported [5][7]. - The focus remains on triple-negative breast cancer (TNBC) patients, with ongoing enrollment in dose expansion cohorts [6][10]. Clinical Data - Updated clinical data from Emi-Le's Phase 1 trial indicated a median progression-free survival (PFS) of 16.0 weeks and a median overall survival (OS) of 5.7 months for patients with B7-H4 low TNBC [8]. - The company plans to report initial clinical data from the expansion portion of its Phase 1 trial in the second half of 2025 [11]. Financial Results - As of March 31, 2025, Mersana had cash and cash equivalents of 29.3 million for Q1 2025 [15][20]. - Collaboration revenue for Q1 2025 was 9.2 million in the same period in 2024, primarily due to reduced revenue from collaboration agreements [15][16]. - The net loss for Q1 2025 was 0.19 per share, compared to a net loss of 0.16 per share, for the same period in 2024 [20][25]. Future Plans - Mersana is set to present at the American Society of Clinical Oncology (ASCO) 2025 Annual Meeting, with two presentations regarding Emi-Le planned [12]. - The company continues to support collaborations with Johnson & Johnson and Merck KGaA, focusing on the development of its ADC platforms [14].