Table 1.

Polymorphism involved in this study.

Genes	Polymorphisms	NCBI SNP ID	Allele	genotypes	References
XRCC1	G28152A (Arg399Gln)	rs25487	Ga	GG	[8, 10–15]
				GA
			Ab	AA
	C26304T (Arg194Trp)	rs1799782	C	CC	[9, 11, 12]
				CT
			T	TT
ERCC2	G934A (Asp312Asn)	rs1799793	G	GG	[9, 11–13]
				GA
			A	AA
	A2251C (Lys751Gln)	rs13181	A	AA	[9, 11, 12]
				AC
			C	CC
XRCC3	C722T (Thr241Met)	rs861539	C	CC	[10, 16]
				CT
			T	TT

^awild allele; ^bmutant allele.