Oral etretinate (Tegison) reduced the lesion size in 82-86% of patients in the first study,106 both when etretinate was the primary drug (19/22, followed by placebo) or when etretinate was used after crossover from placebo (18/22). Placebo reduced lesion size in only 4-3% (1/23) of patients who used placebo before etretinate. Use of placebo following etretinate resulted in no change in lesions for 95% of subjects (18/19).

In the second study,107 etretinate improved the overall grading of lesions in 89-100% of patients (8/9 subjects using etretinate before placebo and 6/6 subjects using etretinate after placebo use). Placebo improved lesion gradings in 17% of subjects who used placebo before crossing over to etretinate (1/6). For those subjects who crossed over to placebo from etretinate, only 11% had any further improvement (1/9).

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