MPO and cervical intraepithelial neoplasia: It is reported that the −463G/A MPO gene polymorphism is not associated with cervical intraepithelial neoplasia and susceptibility to cervical cancer and the genotype GG of MPO with a higher transcriptional activity is a protective against cervical cancer (Mustea et al., 2007; Castelao et al., 2015; Natter et al., 2016).