i. molecular biology of tumors. 1. brain tumors 2. immunophenotypic characterization of infiltrating poly- and mononuclear cells in childhood brain tumors ii. anti-neoplastic biological therapies 3. experimental therapies in brain tumors 4. biologic anti-neoplastic therapies 5. the lymphokine activated killer (lak) cell phenomenon 6. angiogenesis inhibition in anti-neoplastic therapy 7. antigen presentation by dendritic cells and their significance in anti-neoplastic immunotherapy 8. genetically engineered antibodies for direct anti-neoplastic treatment and systematic delivery of various therapeutic agents to cancer cells 9. cancer-testis antigens: promising targets for antigen directed anti-neoplastic immunotherapy iii. appendix 10. materials and methods