Abstract
Ewing's sarcoma family tumors are aggressive small round cell malignancies that arise in bone or soft tissues in adolescents and young adults. The addition of chemotherapy to local control measures has remarkably improved the survival of patients with localized disease. However, metastatic tumors are often refractory to conventional chemotherapy and irradiation, and the outcome of patients with metastatic or recurrent disease remains dismal. Despite growing understanding of the molecular biology of this tumor and the discovery of new therapeutic targets such as the insulin growth factor-1 receptor, tumor resistance continues to be a formidable challenge. Numerous adaptive mechanisms have been identified which allow tumor cells to escape the cytotoxic effect of chemotherapeutic agents. This review focuses on these mechanisms in an effort to highlight opportunities for more effective disease control.
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