CYP1A1 and cervical carcinoma: There are five published meta-analyses directly or indirectly investigated the association between CYP1A1 Ile462Val polymorphism and risk of cervical cancer (Sergentanis et al., 2012; Yang et al., 2012; Wu et al., 2013; Qin et al., 2014; Wang et al., 2015), however, they obtained inconsistent results and with some deficiency (Table 1).