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Table 4 Independent prognostic factors from multivariate analysis for OS

From: Subdivision of M category for nasopharyngeal carcinoma with synchronous metastasis: time to expand the M categorization system

Variable HR 95% CI P value
Age (≥48 years/<48 years) 1.24 0.99–1.57 0.059
UICC N stage (N1–3/N0) 1.84 1.06–3.19 0.031
Number of metastatic lesions (multiple/single) 1.60 117–2.20 0.005
Liver involvement (yes/no) 1.56 1.23–1.96 <0.001
Cycles of chemotherapy (>4/≤4) 0.63 0.50–0.79 <0.001
Radiotherapy to primary tumor (yes/no) 0.59 0.47–0.75 <0.001
  1. UICC International Union Against Cancer, HR hazard ratio, CI confident interval.