Collecting and Storing Tissue, Blood, and Bone Marrow Samples From Patients With Rhabdomyosarcoma or Other Soft Tissue Sarcoma

Inclusion Criteria: * Histologically or cytologically confirmed diagnosis of 1 of the following: * Rhabdomyosarcoma * Non-rhabdomyosarcoma soft tissue sarcoma * Chordoma * Desmoid fibromatosis * Desmoplastic round cell tumors * Undifferentiated embryonal sarcoma of the liver * Unclassified soft tissue sarcoma that is too undifferentiated to be placed in a specific pathologic category in the WHO classification (often called ?undifferentiated soft tissue sarcoma? or ?soft tissue sarcoma NOS?) * Other soft tissue neoplasms, excluding benign tumors * Must have pathological specimens of tumor-containing tissue or bone marrow (beyond that needed by the institution for diagnosis) available for study * No malignant rhabdoid tumor, Ewing sarcoma/primitive neuroectodermal tumor, or osteogenic sarcoma of bone * No osteogenic sarcoma