RATIONALE: Studying protein expression in samples of tumor tissue from patients with cancer in the laboratory may help doctors learn more about changes that occur in DNA and identify biomarkers related to cancer. It may also help doctors find better ways to treat neuroblastoma. PURPOSE: This laboratory studying is looking at protein expression in tumor tissue samples from patients with neuroblastoma.
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ITSN1 is highly expressed in neuroblastoma tumors and plays an important role in the development/progression of these tumors