This research trial studies tumor tissue to identify important proteins and biomarkers from patients with rhabdomyosarcoma that has spread to other places in the body and usually cannot be cured or controlled with treatment. Studying samples of tumor tissue from patients with cancer in the laboratory may help doctors identify biomarkers related to cancer.
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Prevalence of the candidate target (Pax3, Pax7, or Patched-1), and whether the candidate target is expressed in the tumor vs stroma
Timeframe: 1 month