Article
Combined melanocytic and sweat gland neoplasm: cell subsets harbor an identical HRAS mutation in phacomatosis pigmentokeratotica.
Journal of cutaneous pathology - 1 Aug 2014
Li Janet Y, Berger Michael F, Marghoob Ashfaq, Bhanot Umesh K, Toyohara Jennifer P, Pulitzer Melissa P
Abstract excerpt
Phacomatosis pigmentokeratotica (PPK) is characterized by the co-existence of epidermal nevi and large segmental speckled lentiginous nevi of the papulosa type. PPK, previously explained as 'twin spot' mosaicism due to the postzygotic crossing-over of two homozygous recessive mutations, has recently been shown to derive from one postzygotic activating RAS mutation. Epidermal nevi, including those in PPK, are...
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