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IFNL4 -ΔG is associated with prostate cancer among men at increased risk of sexually transmitted infections.
Sexually transmitted infections can reach the prostate gland where their harmful effects are mediated by innate immunity, including interferons. Humans are polymorphic for the germline dinucleotide variant, rs368234815-TT/ΔG, in the IFNL4 gene encoding interferon λ4. Since the IFNL4- ΔG allele has been linked to impaired viral clearance, we hypothesized that potential exposure to sexually transmitted pathogens, as assessed by the number of lifetime sexual partners, may increase prostate cancer risk in an IFNL4- ΔG-dependent manner. Accordingly, we find that men with 10 or more sexual partners and at least one copy of IFNL4- ΔG have a significantly increased risk of prostate cancer while those with the same number of partners but lacking IFNL4- ΔG do not. Moreover, a test for effect modification shows a positive interaction between the number of lifetime partners and IFNL4- ΔG in the development of aggressive prostate cancer. Based on these findings, we conclude that a gene-environment interaction between IFNL4- ΔG and sexual activity may increase the risk of prostate cancer.
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