COL1A1 and dermatofibrosarcoma protuberans: Molecular studies have described that DFSP may often harbour a common chromosomal translocation t (17;22) (q22;q13) with the COL1A1-PDGFB fusion gene between the collagen type Iα1 gene (COL1A1) and the platelet-derived growth factor β-chain gene (PDGFB).