PDGFD and dermatofibrosarcoma protuberans: At the same time, other types of gene fusion, such as COL6A3-PDGFD (Dickson et al., 2018), TNC-PDGFD (Chen et al., 2021), and MAP3K7CL-ERG (Maloney et al., 2019), have been reported in some cases and contribute to the appearance of DFSP.