Men who undergo treatment for psoriasis with psoralen plus ultraviolet A (PUVA) are at increased risk of developing genital squamous cell carcinomas (SCCs) compared to the general population, despite measures to reduce the hazard.
Researchers from the Beth Israel Deaconess Medical Center, Boston, United Sates, performed a prospective cohort study that enrolled 892 men with psoriasis who first received PUVA between 1975 and 1976. Of these, 24 men – 2.7 percent of the total – developed 51 genital neoplasms.
Compared to the general Caucasian population, the risk that men undergoing PUVA would develop invasive penile and scrotal SCCs rose 52.6-fold. Exposure to high doses of PUVA as well as topical tar and ultraviolet B was associated with an increased incidence of genital SCCs. The increase was 4.5 fold compared with those who received low-doses.
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