General Aspects of Childhood Leukemia.-Acute Lymphoblastic Leukemia.-Acute Myelogenous Leukemia.-Myelodysplastic Syndrome.-Myeloproliferative Syndromes.-Non-Hodgkin Lymphoma.-Hodgkin Disease.-Histiocytoses.-Brain Tumors.-Neuroblastoma.-Nephroblastoma (Wilms Tumors).-Soft Tissue Sarcoma.-Osteosarcoma.-Ewing Sarcoma Family of Tumors.-Retinoblastoma.-Germ Cell Tumors.-Hepatic Tumors.- Rare Tumors.- Emergencies in Pediatric Oncology.-Oncological Nursing Care.-Psychology and Psychosocial Issues in Children with Cancer