Medicenna Updates MDNA11 Clinical Trial Results at the ESMO-IO Congress 2025, Further Bolstering its Anti-Tumor Activity in Advanced Solid Tumors

Core Insights - MDNA11 demonstrates durable anti-tumor activity in difficult-to-treat populations, exceeding objective response rate (ORR) benchmarks in immune checkpoint resistant melanoma, MSS endometrial cancer, MSI-H, and TMB-H cancers [1] - The monotherapy expansion cohorts show an ORR of 42% and a disease control rate (DCR) of 83% for patients treated with MDNA11 after progression on immune checkpoint inhibitors [1] - Combination therapy with KEYTRUDA shows an ORR of 50% and a DCR of 75% in MSS endometrial cancer, while MSS TMB-H tumors show an ORR of 25% and a DCR of 88% [1] Clinical Data - In monotherapy cohorts, ORR is 38% in melanoma and 22% in MSI-H tumors, with corresponding DCRs of 75% and 78% respectively [1] - Patients with disease control in monotherapy cohorts had a median overall survival (mOS) of 120.2 weeks compared to 28.6 weeks for those without disease control [7] - In combination cohorts, patients with disease control had a median OS that was not yet reached, compared to 26 weeks for those without disease control [10] Safety Profile - MDNA11 shows a manageable safety profile, with over 90% of treatment-related adverse events being Grade 1-2 and transient, resolving typically within 48 hours [4] - No dose-limiting toxicities were observed at doses up to 120 µg/kg in monotherapy or in combination with KEYTRUDA [4] Recommended Dose - The preliminary recommended dose for expansion for both monotherapy and combination arms is established at 90 µg/kg Q2W, with a biological effective dose range set at 60 to 120 µg/kg [5] Future Developments - Medicenna plans to share new and mature data from the ABILITY-1 study and additional studies in the coming weeks and months [3]