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Ewing sarcoma commonly appears in a bone among patients between 10-20 years old. About 25% of patients present with a clinically detectable metastatic disease. Despite aggressive chemotherapy and radiation, almost no improvement has been seen in patients with metastatic disease (80% mortality). The failure to stop Ewing's sarcoma metastasis is partially due to the lack of understanding about the molecular pathways that regulate its spreading. Dr. Yang and colleagues will study several upstream regulatory genes of TWIST1 in Ewing sarcoma metastasis and test whether drugs targeting these genes will block metastasis with higher specificity and fewer side effects than conventional therapy. In the long term, this research will lead to novel therapeutic regimens for Ewing sarcoma metastasis.