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Extraskeletal Ewing's sarcoma. A preliminary review of 26 cases encountered in the inter group rhabdomyosarcoma study

Twenty‐six of three hundred and fourteen (26/314) patients whose tumors were reviewed by the Pathology Evaluation Committee of the Intergroup Rhabdomyosarcoma Study have histologic subtypes I and II which have morphologic characteristics similar to Ewing's sarcoma of bone. They are somewhat more common in an extremity lesion but have no relation to patient age. Disease‐free survival is good; seventeen of twenty‐six (17/26) or sixty‐five (65%) percent thus far.