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

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

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

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.

ISSN: 1756-9966