SLC22A2 and cervical squamous intraepithelial neoplasia: The inhibitory effect of PPIs on OCT2 and the protective effects of PPIs against CIN have been demonstrated in several studies (Nies et al., 2011; Hacker et al., 2015; Ikemura et al., 2017b; Gao et al., 2019; Gao et al., 2020; Hiramatsu et al., 2020; Ismail et al., 2020; Ghonaim et al., 2021; McSweeney et al., 2021).