SLC22A2 and cervical squamous intraepithelial neoplasia: A variant of human OCT2 rs316019, which inhibits the function of OCT2 (Frenzel et al., 2019), is associated with protection against both CIN (Iwata et al., 2012) and CIO (Lanvers-Kaminsky et al., 2015; Langer et al., 2020).