Node-Sparing Short-Course Radiotherapy (25 Gy/5 Fractions) Combined With Chemoimmunotherapy as Neoadjuvant Treatment for Locally Advanced Esophageal Squamous Cell Carcinoma:A Prospective Single-Arm, Phase II Study

This prospective, single-arm phase II study will evaluate the efficacy and safety of lymphatic-drainage-sparing short-course radiotherapy combined with camrelizumab and nab-paclitaxel/carboplatin as neoadjuvant treatment for patients with resectable, locally advanced thoracic esophageal squamous cell carcinoma. Participants will receive three 3-week cycles of camrelizumab plus chemotherapy, with 25 Gy in 5 fractions of short-course radiotherapy delivered to the primary tumor and radiographically positive lymph nodes while elective lymphatic drainage regions are spared. Definitive McKeown esophagectomy is planned 4-6 weeks after completion of neoadjuvant therapy. The primary endpoint is pathologic complete response (ypT0N0).