We also established five HRDlow models, a BCOR‐rearranged sarcoma (USZ‐20_REA1), an unclassified low‐grade sarcoma (USZ‐21_LG1), a fusion‐driven CIC‐DUX sarcoma (USZ‐21_CIC1), a solitary fibrous tumor (USZ‐20_SFT1) with an NAB2‐STAT6 fusion and an extraskeletal myxoid chondrosarcoma (USZ‐22_EMC2) harboring a TAF15‐NR4A3 fusion. Here, NR4A3 is linked to myxoid chondrosarcoma.