Risk of Cancer in Dermatomyositis or Polymyositis

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Abstract
Sigurgeirsson et al. (Feb. 6 issue)1 used what must now be regarded as unacceptable criteria to distinguish between polymyositis and dermatomyositis. It is very likely that some of their patients classified as having polymyositis in fact had dermatomyositis, and the question of whether there is an increased risk of cancer among patients with polymyositis therefore remains unanswered. The available evidence does strongly indicate a link between dermatomyositis and cancer.

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