Progress in the treatment of children with leukemia and lymphoma results in high cure rates but progress in the treatment of children and adolescents with solid tumors has been slow. Despite aggressive therapy with multimodality treatment involving surgery, radiation and chemotherapy, about two thirds of the patients with metastatic Ewing sarcoma (EWS), metastatic osteosarcoma (OS) and intermediate and high risk rhabdomyosarcoma (RMS) will relapse. The available second line therapies for relapse are limited and often not effective. There is a dire need to look for treatment options beyond conventional means for the treatment of these patients.