2. Histologic proof of solid tumor malignancy (excluding brain stem tumors) at initial diagnosis. Diagnostic Categories include: a) Sarcoma (Soft Tissue and Bone), b) Kidney Tumors, c) Brain Tumors, d) Neuroblastoma, e) Hodgkin's disease and non-Hodgkin's lymphoma, f) Other solid tumors (gonadal and germ cell tumors, malignant melanoma, retinoblastoma, liver tumors, and miscellaneous tumors)