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  • Title: Skin carcinoma in patients with psoriasis treated with topical tar and artificial ultraviolet radiation.
    Author: Stern RS, Zierler S, Parrish JA.
    Journal: Lancet; 1980 Apr 05; 1(8171):732-5. PubMed ID: 6103156.
    Abstract:
    A case-control study, consisting of 59 skin cancer patients with severe psoriasis, was conducted to evaluate the effect of treatment with tar and/or artificial ultraviolet radiation on the risk of developing cutaneous carcinoma. Using 924 unmatched controls, we estimated that the crude rate of skin cancer was 2.4-fold for patients with high exposure to tar and ultraviolet radiation, compared with those lacking high exposure. Using a control series of 126 patients matched for age, skin type, region of residence, sex, history of exposure to ionising radiation, and number of 8-methoxypsoralen photochemotherapy treatments, we observed a stronger association (relative rate = 4.7, 95% confidence limits = 2.2 to 10.0). The magnitude of the relative rates argues for continued surveillance for tumours among patients with psoriasis who receive long-term tar or artificial ultraviolet radiation therapy.
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