Study-specific temporal effects. 4a. Leukemias and lymphomas. 4b. Nervous tissue tumors. 4c. Other tumors. International Classification of Childhood Cancer (ICCC3) Classification Key. Ia. Acute Lymphoid leukemias (ALL). Ib. Acute myeloid leukemias (AML). Ic, d, e, Other leukemias. IIa. Hodgkin lymphoma. IIb, c, d, e. Non-Hodgkin lymphoma. IIIa. Ependymoma and choroid plexus tumor. IIIb. Astrocytomas. IIIc. Intracranial and intraspinal embryonal tumors. IIId. Other gliomas. IIIe, f Other CNS tumors. IV. Neuroblastoma and other peripheral nervous cell tumors. V Retinoblastoma. VI. Renal tumors. VII. Hepatic tumors. VIII. Malignant bone tumors. IX. Soft tissue and other extraosseous sarcomas. X. Germ cell tumors, trophoblastic tumors, and neoplasms of gonads. XI. Other malignant epithelial neoplasms and malignant melanomas. XII. Other and unspecified malignant neoplasms (including uncoded).