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A subset of deadly pediatric cancers, known as sarcomas, are caused by a mysterious, mutated protein called CIC::DUX4. Treating this disease is very difficult, in part because little is known about its biology. The teams of Dr's. Wood and Hendrickson have assembled the world's best collection of CIC::DUX4 laboratory models, using them to discover that CIC::DUX4 sarcomas require a protein called COP1 for their survival, whereas normal tissues in bodies do not. Dr. Wood and colleagues will perform studies to understand how well future drugs targeting COP1 will work as therapies for this deadly disease while defining why this disease needs COP1 in the first place. Together, these studies will identify a highly promising new therapeutic strategy for CIC::DUX4 sarcoma while also revealing insights that could lead to additional new types of drugs for this disease.