Anti-PD1 Monoclonal Antibody Combined With Nimotuzumab and Capecitabine in Patients With First-line Platinum-resistant Recurrent/Metastatic Nasopharyngeal Carcinoma

"Combination phase Anti-PD1 monoclonal antibody: Choose one of the anti-PD-1 monoclonal antibody drugs reimbursed by medical insurance, toripalimab (240mg), camrelizumab (200mg), tislelizumab (200mg) or others; Intravenous infusion, every 3 weeks .~Nimotuzumab:: In the first 6 cycles, 200 mg, intravenous infusion, every 1 week, and 400 mg is administered for the first time.~Capecitabine: 1000 mg/m2, orally twice daily on days 1-14, every 3 weeks~Maintenance phase:~Anti-PD1 monoclonal antibody: anti-PD-1 monoclonal antibody drugs, Intravenous infusion, every 3 weeks.~Nimotuzumab treatment: 400 mg, intravenous infusion, every 3 weeks. Capecitabine: 1000 mg/m2, orally twice daily on days 1-14, every 3 weeks；~The duration of treatment is 1 year or until intolerable toxic reactions occur, or disease progresses, or the patient withdraws consent, or the investigator determines that the patient needs to withdraw from treatment."