This investigation evaluated seven DFSPs (four vulvar and three groin) for the presence of COL1A1-PDGFB fusion transcripts by reverse transcriptase-polymerase chain reaction (RT-PCR), using archival formalin-fixed, paraffin-embedded tissue.     ///    Dermatofibrosarcoma protuberans of the vulva and groin: detection of COL1A1-PDGFB fusion transcripts by RT-PCR..     ///    "Six of seven cases (three vulvar, three groin) contained a COL1A1-PDGFB fusion transcript. "    ///    "This investigation evaluated seven DFSPs (four vulvar and three groin) for the presence of COL1A1-PDGFB fusion transcripts by reverse transcriptase-polymerase chain reaction (RT-PCR), using archival formalin-fixed, paraffin-embedded tissue."    ///    "As in DFSP at other sites, COL1A1- PDGFB chimeric fusion transcripts are present in vulvar and groin DFSP. "