STRATUS-NSCLC-01 is a multicenter, phase I/II clinical study designed to evaluate the safety and efficacy of induction chemoimmunotherapy followed by concurrent chemoradiotherapy and consolidation immunotherapy in patients with unresectable locally advanced non-small cell lung cancer (NSCLC). Patients are stratified according to baseline tumor extent and radiotherapy feasibility. Participants suitable for definitive thoracic radiotherapy receive induction chemoimmunotherapy followed by concurrent chemoradiotherapy and consolidation immunotherapy, while patients with excessive tumor burden or unfavorable dosimetric parameters may receive induction chemoimmunotherapy followed by carbon-ion radiotherapy and consolidation immunotherapy. The study aims to investigate whether treatment intensification before radiotherapy can improve long-term outcomes beyond the standard PACIFIC strategy while maintaining acceptable safety.