Detection of COL1A1-PDGFB fusion transcripts and PDGFB/PDGFRB mRNA expression in dermatofibrosarcoma protuberans..     ///    A reverse transcription-polymerase chain reaction assay was performed to detect the COL1A1-PDGFB fusion transcripts in 57 samples.     ///    "These results indicate that the fusion protein, which is processed by the COL1A1-PDGFB transcripts, can serve as a functional ligand for PDGFRB.. "