RATIONALE: Studying samples of blood and tissue from patients with cancer in the laboratory may help doctors learn more about changes that occur in DNA and find biomarkers related to cancer. It may also help doctors find better ways to treat cancer. PURPOSE: This research trial studies genes in samples from younger patients with rhabdomyosarcoma.
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Frequency of particular genetic lesions
Identification of mutations that occur in at least 5% of rhabdomyosarcomas as a whole