Toripalimab Combined With Platinum-based Chemotherapy With or Without H1 Receptor Antagonist in the Perioperative Treatment of Resectable Non-small Cell Lung Cancer

The goal of this clinical trial is to evaluate the efficacy and safety of H1 receptor antagonist (diphenhydramine) combined with toripalimab plus standard platinum-based chemotherapy in the perioperative setting in subjects with operable NSCLC. The subjects of this study are patients with histologically or cytologically confirmed stage II-III NSCLC (AJCC Version 9) who are planned to receive neoadjuvant therapy with toripalimab combined with standard platinum-based chemotherapy. Eligible subjects were randomized at a 1:1 ratio to receive 3-4 cycles of neoadjuvant diphenhydramine (an H1 receptor antagonist) plus toripalimab and standard platinum-based chemotherapy, or toripalimab plus platinum-based chemotherapy alone, followed by treatment response evaluation and definitive surgery. After surgery, the experimental group will receive maintenance therapy with diphenhydramine (an H1 receptor antagonist) plus toripalimab for 13-14 cycles, while the control group will receive toripalimab monotherapy for the same 13-14 cycles.