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