Adjuvant vs Surgery Only in Early-stage Recurrent NPC

Inclusion Criteria: 1. Pathologically diagnosed with recurrent nasopharyngeal carcinoma; 2. Stage rT1 or rT2(superficial parapharyngeal space, distance to internal carotid artery \>5mm)or rT3 (confined to the bottom wall of the sphenoid sinus),according to AJCC 8th edition; 3. Cervical lymph node metastasis can be controlled locally 4. Age 18 to 75 years; 5. Without distant metastasis; 6. Informed consent forms signed; 7. ≥6months from the accomplishment of radiation to recurrence 8. previously radiotherapy for only 1 course; 9. ECOG score 0-2 and can tolerate chemotherapy and immunotherapy 10. Sufficient organ function; 11. Undergone endoscopic surgery with negative pathological margin; Exclusion Criteria: 1. Participation in other interventional clinical trials; 2. Uncontrolled illnesses which will interfere with the ability to undergo therapy; 3. Suffering from another or multiple malignancy within 5 years (excluding fully treated basal cell or skin squamous cell carcinoma, cervical carcinoma in situ); 4. Any contradiction to immune and chemotherapy; 5. With serious autoimmune disease; 6. Currently usage of immunosuppressive agents or systemic glucocorticoid therapy (dosage\>10mg/day prednisone or other glucocorticoids), and continuing to use them within 2 weeks before the first administration of trial drugs; 7. Severe allergic reactions to other monoclonal antibodies; 8. History of radioactive particle planting; 9. Vaccination with live vaccine within 4 weeks prior to initial administration or possibly during the study period; 10. Female patients who are at pregnancy or lactation; 11. Other situations that the researchers believe are not suitable for enrollment