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A case of acanthosis nigricans in obese siblings with a pedigree of famihal polyposis coli

Acanthosis nigricans (AN) is generally classified into the malignant, benign and pseudo-types. The malignant type is the most frequently reported and 65% of the benign type are associated with diabetes mellitus (218 of 337 reports, 1969-1995, our investigation). Moreover, familial reports are not frequent, and previous reports have suggested that AN is endocrinological or hereditary in origin, but the cause remains unclear. Familial polyposis coli (FPC), on the other hand, is a rare autosomal dominant intestinal disease that progresses to cancer in many cases. Both AN and FPC are autosomal dominant, but no common human leukocyte antigen (HLA) typing between these diseases has been reported previously.