Trastuzumab Rezetecan and Adebrelimab, Alone or in Combination, After Chemoradiotherapy for HER2-Altered Unresectable Stage III Lung Cancer

This is a randomized, open-label, multi-center phase II study evaluating the efficacy and safety of consolidation therapy with Trastuzumab Rezetecan combined with Adebrelimab versus Trastuzumab Rezetecan monotherapy versus Adebrelimab monotherapy in patients with unresectable stage III NSCLC harboring HER2 alterations (mutation or overexpression) who have not progressed after definitive concurrent or sequential chemoradiotherapy. Eligible patients will be randomized in a 1:1:1 ratio to receive either combination therapy, SHR-A1811 alone, or Adebrelimab alone for up to 12 months. The primary endpoint is progression-free survival (PFS) per RECIST v1.1.