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UDS Revision 1 Supplementary Data Supplementary Figure 1: Representative photomicrographs of the spindle cell (A), round cell (B), and epithelioid (C) variants of undifferentiated sarcoma Supplementary Figure 2: GISTIC analysis of recurrent focal copy number alterations References: 1. Fletcher CDM, Chibon F, Mertens F. Undifferentiated/unclassified sarcomas. In: Fletcher CDM, Bridge JA, Hogendoorn P, Mertens F, eds. WHO Classification of Tumours of Soft Tissue and Bone. 4th edition: IARC: Lyon; 2013:236-238. 2. Sugita S, Arai Y, Tonooka A, et al. A novel CIC-FOXO4 gene fusion in undifferentiated small round cell sarcoma: a genetically distinct variant of Ewing-like sarcoma. Am J Surg Pathol. 2014;38(11):1571-1576. 3. Crist WM, Anderson JR, Meza JL, et al. Intergroup rhabdomyosarcoma study-IV: results for patients with nonmetastatic disease. Journal of clinical oncology : official journal of the American Society of Clinical Oncology. 2001;19(12):3091-3102. 4. 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Cancer epidemiology, biomarkers & prevention : a publication of the American Association for Cancer Research, cosponsored by the American Society of Preventive Oncology. 2012;21(7):1012-1018. 41. Lynn M, Wang Y, Slater J, et al. High-resolution genome-wide copy-number analyses identify localized copy-number alterations in Ewing sarcoma. Diagnostic molecular pathology : the American journal of surgical pathology, part B. 2013;22(2):76-84. 42. Schofield DE, Fletcher JA, Grier HE, Yunis EJ. Fibrosarcoma in infants and children. Application of new techniques. Am J Surg Pathol. 1994;18(1):14-24. 43. Afify A, Mark HF. Trisomy 8 in embryonal rhabdomyosarcoma detected by fluorescence in situ hybridization. Cancer Genet Cytogenet. 1999;108(2):127-132. 44. Jones L, Wei G, Sevcikova S, et al. Gain of MYC underlies recurrent trisomy of the MYC chromosome in acute promyelocytic leukemia. The Journal of experimental medicine. 2010;207(12):2581-2594. 45. 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