Reduction of Postoperative Radiotherapy in Head and Neck Squamous Cell Carcinoma

Inclusion Criteria: * Preoperative pathologically confirmed initial treatment of head and neck squamous cell carcinoma * Receive neoadjuvant chemotherapy combined with PD-1 monoclonal antibody immunotherapy, and meet one of the following conditions: Preoperative clinical stage was T3-T4 or N2-N3 (AJCC 8th edition). Patients with oral cancer/oropharyngeal cancer had positive lymph nodes in the IV/V region with imaging diagnosis or biopsy confirmation before surgery. HPV/ P16-positive oropharyngeal cancer patients with clinical lymph node invasion (ENE), one positive cervical lymph node \> 3cm or multiple positive cervical lymph nodes before surgery * The pathology of at least one cervical lymph node was determined by pCR； * Karnofsky's physical status score ≥70 points； * Age: 18 \~ 70 years old； * Laboratory examination results within 1 week before enrollment met the following conditions: neutrophils (ANC) ≥1.5×109/L, platelets (PLT) ≥ 75×109/L * Patients participate voluntarily and sign informed consent forms. Exclusion Criteria: * Previous head and neck radiation treatment * Severe complications； * Pregnant or lactating women * Who were deemed unsuitable for inclusion by the researchers.