“…22,23 In addition to sharing histopathological features, cervical and head and neck cancers had similar risk factors, for example, higher number of sexual partners, younger age at first intercourse, practice of oral sex, and history of genital warts. 30 We address these inconsistencies by using data from a large case-control study conducted in Montreal, Canada, to estimate the extent to which life course oral sex practice is associated with an increased risk of OPC, and how much of the association is mediated by oral HPV infection. The observed discrepancies may be explained by the choice of oral sexual behavior indicators, confounding effects, or statistical strategy used.…”