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Instil Bio (TIL) filed an 8-K (Item 8.01) reporting partner ImmuneOnco’s interim data from a Phase 2 open-label study of bispecific antibody IMM2510/AXN-2510 plus chemotherapy in first-line advanced non-small-cell lung cancer (NSCLC) patients in China.
By 1 Jul 2025, 33 patients had received 10 mg/kg; 21 were efficacy-evaluable. The overall partial response rate (PRR) was 62 %, with a pronounced signal in squamous NSCLC (80 %, 8/10) versus non-squamous (46 %, 5/11). Most patients had undergone only a single tumor assessment at the data cut-off, limiting durability insight.
Safety appeared acceptable: no dose-limiting toxicities, no treatment-related deaths or dose reductions, and just one discontinuation. Grade �3 treatment-related adverse events were mainly hematologic and infrequent; VEGF-linked and immune events were uncommon and generally low-grade.
The dataset will be presented at a future medical meeting. Though preliminary and based on a small cohort, the efficacy signal and tolerability profile are encouraging for �2510’s continued development and could strengthen Instil’s oncology pipeline prospects.