Table 2. The XRCC1 Arg194Trp and Arg280His polymorphisms on CC risk.

Variables	Na	Subgroup	OR (95%CI)	Pooled methods		P b–heterogeneity P value		P–Publication bias
								Beggc	Eggerd
Arg194Trp C/T
Trp/Trp vs Arg/Arg	5	All	2.21(1.60,3.06)		Fixed M-H method	0.53	0.000	0.73	0.64
Arg/Trp vs Arg/Arg	5	All	1.23(1.02,1.49)		Fixed M-H method	0.39	0.03	0.31	0.15
Dominant	5	All	1.36(1.14,1.63)		Fixed M-H method	0.71	0.001	1.00	0.63
Recessive	5	All	2.06(1.51,2.82)		Fixed M-H method	0.54	0.000	0.73	0.73
Arg280His G/A
His/His vs Arg/Arg	2	All(Asian)	1.60(0.74,3.44)		Fixed M-H method	0.18	0.23	1.00	NA
Arg/His vs Arg/Arg	2	All(Asian)	1.03(0.81,1.32)		Fixed M-H method	0.82	0.81	1.00	NA
Dominant	2	All(Asian)	1.07(0.84,1.36)		Fixed M-H method	0.37	0.58	1.00	NA
Recessive	2	All(Asian)	1.59(0.74,3.41)		Fixed M-H method	0.18	0.24	1.00	NA

NA, not application.

^aNumber of comparisons.

^b P value of Q-test for heterogeneity test. Random-effects model was used when P value for heterogeneity test <0.1; otherwise, fixed-effects model was used.

^c P of Begg, P value of Begg rank correlation method for testing publication bias.

^d P of Egger, P value of Egger rank correlation method for testing publication bias.