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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.