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The formation of a high-ploidy is rare in Ewing tumor (ET) and is in contrast to some other childhood tumors such as neuroblastoma. In a series of 37 Ewing tumors analyzed by conventional cytogenetics, 4 of the 34 tumors with an abnormal clone (11.8%) demonstrated the presence of a high-ploidy clone, with a chromosome number that ranged from hypotriploid to pentaploid. All 4 contained a t(11;22)(q24;q12)...