Solid TumorAdult Central Nervous System Germ Cell TumorAdult RhabdomyosarcomaChildhood Central Nervous System Germ Cell TumorChildhood Soft Tissue SarcomaEwing SarcomaMetastatic Ewing Sarcoma/Peripheral Primitive Neuroectodermal TumorOvarian Mixed Germ Cell TumorPreviously Untreated Childhood RhabdomyosarcomaRecurrent Adult Brain TumorRecurrent Adult Soft Tissue SarcomaRecurrent Childhood Brain Stem GliomaRecurrent Childhood Cerebellar AstrocytomaRecurrent Childhood Cerebral AstrocytomaRecurrent Childhood EpendymomaRecurrent Childhood Malignant Germ Cell TumorRecurrent Childhood MedulloblastomaRecurrent Childhood PineoblastomaRecurrent Childhood Supratentorial Primitive Neuroectodermal TumorRecurrent Childhood Visual Pathway and Hypothalamic GliomaRecurrent Childhood Visual Pathway GliomaRecurrent Ewing Sarcoma/Peripheral Primitive Neuroectodermal TumorRecurrent Extragonadal Germ Cell TumorRecurrent Extragonadal Non-seminomatous Germ Cell TumorRecurrent Malignant Testicular Germ Cell TumorRecurrent NeuroblastomaRecurrent Ovarian Germ Cell TumorRecurrent Wilms Tumor and Other Childhood Kidney TumorsUnspecified Adult Solid Tumor, Protocol SpecificUnspecified Childhood Solid Tumor, Protocol Specific