Eradication of low tumor burdens can occur in vivo when T-cell mediated responses are generated against specific tumor antigens. The Ewing's sarcoma family of tumors (ESFT) and alveolar rhabdomyosarcoma (AR) display several features which make them candidate diseases for trials of such immunotherapy. First, intensive cytotoxic chemotherapy is generally able to eradicate bulk disease in patients with metastatic disease, but tumor relapse eventually occurs in nearly all patients. Second, tumor-specific chromosomal translocations resulting in the production of novel fusion proteins have been identified in the great majority of these tumors. Peptides derived from these fusion proteins have been shown to function as tumor antigens for cytolytic T cells in animal studies. Third, studies of immune reconstitution after intensive cytotoxic therapy have provided evidence that antigen-specific T cells can be generated in vivo when the adoptive transfer of peripheral T cells and antigen are provided during the period of T cell regeneration. This process can be augmented in murine models by the use of human immunodeficiency virus (HIV) active protease inhibitor, indinavir, potentially through inhibition of programmed cell death in expanding T cells. Merging these concepts, this protocol will attempt to eradicate minimal residual disease in pediatric patients with metastatic ESFT and AR via vaccination with tumor-specific peptides undertaken concomitant with autologous T cell transplantation and indinavir.