Table S2.

Results of comprehensive quality assessment of included studies for the meta-analysis and systematic review

References	Representativeness of cases	Representativeness of controls	Ascertainment of cancer diagnosis	Ascertainment of controls	Genotyping examination	HWE	Association assessment	Total score
Speer et al1	1	2	0	1	0	2	1	7
Peters et al2	2	2	1	2	1	2	2	12
Fuszek et al3	2	1	1	0	0	0	1	5
Bácsi et al4	2	1	1	1	1	2	1	9
Dong et al5	2	2	1	1	1	2	2	11
Jenab et al6	2	2	1	1	1	2	2	11
Jacobs et al7	2	2	1	1	0	0	2	8
Schwartz et al8	2	2	1	2	1	2	2	12
Szendroi et al9	2	2	1	1	0	2	2	10
Safaei et al10	2	2	1	2	0	1	1	9
Fedirko et al11	2	N/A	1	N/A	0	0	2	5
Shui et al12	2	2	1	2	1	2	2	12
Hibler et al13	2	N/A	1	N/A	0	2	2	7
Anderson et al14	2	2	1	1	0	2	2	10
Kim et al15	2	1	0	1	0	2	1	7
Jorde et al16	2	2	1	2	0	2	2	11
Masvidal et al17	2	N/A	1	N/A	0	2	1	6
Mahmoudi et al18	2	2	1	2	0	2	2	10
Li et al19	2	1	1	2	0	2	2	10

Abbreviations: HWE, Hardy–Weinberg equilibrium; N/A, not applicable.