Study of Kidney Tumors in Younger Patients

Inclusion Criteria: * Patients with the first occurrence of any tumor of the kidney identified on CT scan or MRI are eligible for this study; histologic diagnosis is not required prior to enrollment but is required for all patients once on study * Eligible tumors include (but are not limited to): * Nephroblastic tumors * Nephroblastoma (Wilms' tumor) (favorable histology, anaplasia \[diffuse, focal\]) * Nephrogenic rests and nephroblastomatosis * Cystic nephroma and cystic partially differentiated nephroblastoma * Metanephric tumors (metanephric adenoma, metanephric adenofibroma, metanephric stromal tumor) * Mesoblastic nephroma (cellular, classic, mixed) * Clear cell sarcoma * Rhabdoid tumor (any malignant rhabdoid tumor occurring outside the central nervous system \[CNS\]) * Renal epithelioid tumors of childhood (papillary renal cell carcinoma, medullary renal cell carcinoma, renal tumors associated with Xp11.2 translocations, oncocytic renal neoplasms after neuroblastoma) * Angiolipoma * Ossifying renal tumor of infancy * Patients with the first occurrence of the following tumors are also eligible: * Extrarenal nephroblastoma or extrarenal neprogenic rests * Malignant rhabdoid tumor occurring anywhere outside the central nervous system * Required specimens, reports, forms, and copies of imaging studies must be available or will become available for submission and the institution must intend on submitting them as described in the protoc…