Background Photochemotherapy with oral methoxsalen (psoralen)and ultraviolet A radiation (PUVA) is an effective treatmentfor psoriasis. However, PUVA is mutagenic, increases the riskof squamous-cell skin cancer, and can cause irregular, pigmentedskin lesions. We studied the occurrence of melanoma among patientstreated with PUVA.
Methods We prospectively identified cases of melanoma and documentedthe extent of exposure to PUVA among 1380 patients with psoriasiswho were first treated with PUVA in 1975 or 1976. Using incidencedata, we calculated the expected incidence of melanoma in thiscohort and compared it with the observed incidence. Using regressionmodels, we assessed the risks of melanoma associated with along time (>15 years) since the first treatment and witha large number of PUVA treatments (>250).
Results From 1975 through 1990, we detected four malignant melanomas,about the number expected in the overall population (relativerisk, 1.1). From 1991 through 1996, we detected seven malignantmelanomas (relative risk, 5.4; 95 percent confidence interval,2.2 to 11.1). The risk of melanoma was higher in the later periodthan in the earlier one (incidence-rate ratio, 3.8) and higheramong patients who received at least 250 PUVA treatments thanamong those who received fewer treatments (incidence-rate ratio,3.1).
Conclusions About 15 years after the first treatment with PUVA,the risk of malignant melanoma increases, especially among patientswho receive 250 treatments or more.
Source Information
From the Department of Dermatology, Beth Israel Deaconess Medical Center and Harvard Medical School, Boston.
Address reprint requests to Dr. Stern at 330 Brookline Ave., Boston, MA 02215.
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