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Mersana Therapeutics (MRSN) investor relations material
Mersana Therapeutics Corporate Presentation summary
Complete event summary combining all related documents: earnings call transcript, report, and slide presentation.
Strategic focus and pipeline overview
Advancing Emi-Le (XMT-1660) for post-topo-1 TNBC, with >40 patients enrolled and initial expansion data expected in 2H 2025.
XMT-2056, a STING-agonist HER2 ADC, is in Phase 1 dose escalation with initial pharmacodynamic data planned for 2025.
Multiple collaborations with GSK, Johnson & Johnson, and Merck KGaA, plus preclinical ADC candidates available for partnering.
Proprietary Dolasynthen and Immunosynthen platforms designed to overcome ADC limitations and expand clinical potential.
Next-generation ADC platforms and differentiation
Dolasynthen platform offers customizable DAR, reduced toxicities, and controlled bystander effect for enhanced efficacy.
Immunosynthen platform enables tumor-specific STING activation, aiming for potent innate immune stimulation.
Both platforms support monotherapy and combination strategies, with preclinical candidates open for partnerships.
Emi-Le (XMT-1660) clinical development and data
Emi-Le targets B7-H4, a clinically validated marker in TNBC and other tumors, with two FDA Fast Track designations.
Phase 1 dose expansion ongoing in heavily pretreated TNBC patients, all with prior topo-1 ADC exposure.
Safety profile shows no dose-limiting neuropathy, neutropenia, ocular toxicity, ILD, or thrombocytopenia; most TRAEs are low grade and reversible.
Clinical activity correlates with both dose and B7-H4 expression, with ORR up to 29% in B7-H4 high TNBC patients with ≤4 prior lines.
High-dose cohorts suggest a dose-response relationship, with protocol amendments to mitigate proteinuria-related dose delays.
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