COL1A1 and dermatofibrosarcoma protuberans: For example, dermatofibrosarcoma protuberans in people is characterized by a pathognomonic COL1A1-PDGFB gene fusion (87), and though this fibrosarcoma subtype is not recognized in canine patients, RNA-seq analysis of a dermatofibrosarcoma protuberans-like tumor from a dog revealed an equivalent COL3A1-PDGFB fusion suggesting the presence of an analogous canine tumor (88).