“…A total of 15 publications regarding IL-16 gene polymorphisms and cancer risk were identified. Nine publications were excluded after reading the full article in detail, because they were editorial comment, letter, case report, other polymorphism of IL-16, without sufficient data, repeated literatures and violated HWE (Thomas et al, 2008;Obara et al, 2010;Azimzadeh et al, 2012;Batai et al, 2012;Lin et al, 2012;Deng et al, 2012;Du, et al, 2012;Hughes et al, 2013;Zhang et al, 2013). The study of Gao et al (2009b) presented separate OR by colorectal and gastric two cancer types and each of them was considered as a separate study.…”