This is the first report of a DFSP case where the lack of chromosomes 17 and 22 rearrangement and the absence of COL1A1-PDGFB fusion gene have been demonstrated.     ///    "So far, the COL1A1-PDGFB fusion gene remains the sole fusion gene identified in DFSP. "    ///    Complex t(5;8) involving the CSPG2 and PTK2B genes in a case of dermatofibrosarcoma protuberans without the COL1A1-PDGFB fusion..     ///    "So far, the COL1A1-PDGFB fusion gene remains the sole fusion gene identified in DFSP."    ///    "Although rare, the existence of cases of DFSP negative for the COL1A1-PDGFB fusion has to be taken in consideration when performing molecular diagnosis for a tumor suspected to be a DFSP.. "