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Previous Volume 341:1474-1475 November 4, 1999 Number 19 Next

	Since this article has no abstract, we have provided an extract of the first 100 words of the full text and any section headings.

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To the Editor: Actinic (or solar) keratosis is a potential precursor of squamous-cell carcinoma of the skin. Its development is related to the cumulative exposure to ultraviolet radiation from the sun and the sensitivity of people to this radiation. Many drugs have photosensitizing effects,^1,2,3 and some, such as psoralens⁴ and fluoroquinolones,⁵ augment photocarcinogenesis. We hypothesized that other photosensitizing drugs could also act in this way.

We studied 68 consecutive patients more than 60 years of age who were attending our dermatology clinic for various skin conditions other than actinic keratosis. We asked each patient if he or she had taken . . . [Full Text of this Article]

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