50 patients from 5 centers received protocol-specified therapy; 38% discontinued early. Median PFS was 14.9 months, and 1-year OS rate was 74.8%. 72% achieved objective response, with 83.3% of responders maintaining response >6 months. 92% experienced any grade AEs, and 78% had grade ≥3 events. 48% had immune-related AEs, with 6% experiencing grade ≥3 irAEs.