Table 3.

The frequencies of alleles of candidate genes in control and case cohorts for esophageal cancer.

Polymorphism	The allele variant	The frequency of allele
		Control cohort	Case cohort
GSTT1	Functional (+)	0.365	0.178
	Deletion (−)	0.635	0.822
GSTM1	Functional (+)	0.510	0.204
	Deletion (−)	0.490	0.796
XRCC1 Arg194Trp	194Arg	0.855	0.852
	194Trp	0.145	0.148
XRCC1 Arg399Gln	399Arg	0.725	0.657
	399Gln	0.275	0.343
XRCC3 Trp241Met	241Trp	0.815	0.822
	241Met	0.185	0.178
TP53 Arg72Pro	72Arg	0.760	0.657
	72Pro	0.240	0.343
CCND1 A870G	870A	0.450	0.404
	870G	0.550	0.596