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%, indicating the potential of MDNA11 in earlier lines of treatment [1] - Combination treatment with KEYTRUDA shows promising results, with an ORR of 50% and a DCR of 75% in MSS endometrial cancer [1][9] Clinical Data - In monotherapy expansion cohorts, ORRs are 38% in melanoma and 22% in MSI-H tumors, with corresponding DCRs of 75% and 78% respectively [1] - Patients treated with MDNA11 as the next treatment after immune checkpoint inhibitors had an ORR of 42% [8] - In MSS endometrial cancers, the ORR was 50% with a DCR of 75%, while TMB-H tumors showed an ORR of 25% and a DCR of 88% [9] Safety Profile - MDNA11 exhibits a manageable safety profile, with over 90% of treatment-related adverse events being Grade 1-2 and transient [4] - No dose-limiting toxicities were observed at doses up to 120 µg/kg, and Grade 3-4 events were mainly laboratory abnormalities without clinical sequelae [4] Overall Survival - In monotherapy cohorts, patients with disease control 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] 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] - The NEO-CYT trial provides external validation of MDNA11's approach, suggesting its potential as a de-risked drug candidate for earlier stage cancer patients [3]