Survival analysis based on treatment [chemoradiotherapy (CRT) and radiotherapy (RT)] in matched pairs of patients with stages III–IV nasopharyngeal carcinoma and platelet count >300 × 10
/L. A, overall survival. B, locoregional recurrence–free survival. C, distant metastasis–free survival. Hazards ratios (HRs) were calculated using the unadjusted Cox proportional hazards model. P values were calculated using the unadjusted log-rank test.