Surgery Alone Verus Sugery Combined with Dose-reduced Radiotherapy for Newly Diagnosed Stage I Nasopharyngeal Carcinoma

Inclusion Criteria: Inclusion Criteria: * Performance Status Score 0-1 points. * Non-keratinized carcinoma of the nasopharynx (differentiated or undifferentiated, i.e., WHO type II or III) confirmed histologically and/or cytologically. * According to the UICC/AJCC eighth edition staging, the patient is defined as T1N0M0 stage I. * Adequate organ function: WBC ≥ 4×10\^9 /L, NEUT ≥ 2×10\^6 /L, HGB ≥ 9 g/dL, PLT count ≥ 100×10\^9/L, TBIL ≤1.5 ULN, ALT ≤3 ULN, AST ≤3 ULN, ALP ≤3 ULN, ALB ≥ 3 g/dL, INR or APTT≤1.5 ULN, Scr ≤1.5 ULN or Ccr ≥ 60 mL/min. * Informed Concent signed with willingness to obey the follow-up, treatment, examination and any other programs according to the research protocol. Exclusion Criteria: * Diagnosed as recurrent or distant metastatic nasopharyngeal carcinoma or together with any other malignancy. * Suffering severe organ dysfunction or physical disorder which could not tolerate surgery or radiotherapy. * Unable to cooperate with regular follow-up due to psychological, social, domestic or geological reasons. * During pregnancy or lactation. * Other patients that the chief physician considered as illegal for this trial.