Table 6. The analysis of heterogeneity and publication bias.

Group	SNP	Comparison	Heterogeneity		Model	Begg's test		Egger's test
			I2	Pheterogeneity		z	PBegg	t	PEgger
SSC	rs1800629	A vs G	77.5%	<0.001	Random	0.49	0.621	0.07	0.942
		AA vs GG	30.0%	0.137	Fixed	1.20	0.228	1.67	0.120
		GA vs GG	66.3%	<0.001	Random	0.00	1.000	−0.42	0.683
		GA+AA vs GG	71.4%	<0.001	Random	−0.05	1.000	−0.12	0.903
		AA vs GG+GA	23.2%	0.203	Fixed	1.20	0.228	1.75	0.105
		carrier A vs G	64.0 %	<0.001	Random	0.00	1.000	−0.17	0.864
SSC	rs361525	A vs G	66.2%	0.019	Random	0.73	0.462	0.05	0.962
		GA vs GG	67.7%	0.015	Random	0.73	0.462	0.05	0.962
		GA+AA vs GG	59.8%	0.029	Random	0.38	0.707	0.09	0.930
		carrier A vs G	63.2%	0.028	Random	0.73	0.462	−0.03	0.978
skin cancer	rs1800629	A vs G	46.1%	0.084	Fixed	0.30	0.764	−0.68	0.528
		AA vs GG	38.6%	0.148	Fixed	0.38	0.707	0.33	0.756
		GA vs GG	45.4%	0.089	Fixed	0.30	0.764	−1.36	0.233
		GA+AA vs GG	46.6%	0.081	Fixed	0.60	0.548	−1.04	0.347
		AA vs GG+GA	38.1%	0.152	Fixed	0.38	0.707	0.49	0.650
		carrier A vs G	7.4%	0.372	Fixed	0.30	0.764	−0.95	0.387

SCC: squamous cell carcinoma; SNP: single nucleotide polymorphisms.