As a result of the known effects of intralesional interferon alfa 2b (Intron A) on actinic keratoses, we have now examined the effects of topical interferon alfa 2b gel on actinic keratoses. Twenty-four subjects each treated three actinic keratoses with either interferon gel 30 million IU/gm or a placebo preparation applied topically 4 times a day for 4 weeks. Although more lesions treated with the active interferon showed clinical improvement, this difference was not statistically significant.
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Edwards et al. (1990) studied this question.
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