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Procollagen 1 – a marker of fibroblastic and fibrohistiocytic skin tumors

Background:  When dealing with tumors of presumed fibroblastic or fibrohistiocytic origin, immunohistochemistry is traditionally done to exclude a tumor of non‐fibroblastic or non‐fibrohistiocytic nature, because a reliable marker of fibroblastic or fibrohistiocytic cell origin is still to be introduced. This study investigates whether procollagen 1 is a useful marker of skin tumors composed of cells derived from fibroblasts or fibrohistiocytes.