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Table 4 Risk factors affecting 1-year disease free survival and 2-year overall survival rate determined by Cox regression analysis

From: High ERCC1 expression predicts cisplatin-based chemotherapy resistance and poor outcome in unresectable squamous cell carcinoma of head and neck in a betel-chewing area

Variables PFS OS
  HR (95%CI) P HR (95%CI) P
ERCC1 expression     
   Low vs High 0.27 (0.12-0.61) 0.001 0.31 (0.13-0.75) 0.010
Betel nuts     
   Never vs Used NE 0.647 0.35 (0.13-0.98) 0.045
  1. CI, confidence interval; HR, Hazard ratio