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Table 1 The characteristic of patients group with squamous cell carcinoma of the head and neck (HNSCC).

From: Genetic polymorphisms in DNA base excision repair gene XRCC1 and the risk of squamous cell carcinoma of the head and neck

Patients Sex Tumor stage
(TNM)
Smoking status
(cigarettes per day)
No. men women T N M non 10cc* 20cc* 20cc***
    1 2 3 4 0 1 2 3 0 1     
92 83 9 15 17 31 29 62 15 10 5 92 0 26 9 33 24
  1. T (1–4) – size or direct extent of the primary tumor; N (0–3) – degree of spread to regional lymph nodes; M (0/1) – presence of metastasis; non – not smoking; * – smoking for ten years; ** – smoking for twenty years; *** – smoking for thirty years.