The present report of pre-professional practices aims to characterize the antineoplastic treatment regimens used in the Pediatric Hematology Service of the Hospital of High Complexity Virgen de la Puerta - EsSalud, from June to December 2016. For this purpose, Data the main diagnoses of the patients hospitalized in the service, as well as the most used treatment regimens, the diluents used in their reconstitution and the stability of the prepared oncological mixtures. The main diagnoses of the patients were acute lymphoblastic leukemia with 86.96%, acute myeloid leukemia with 8.7% and B-cell lymphoma, with no other specification with 4.31%; Also the most used antineoplastic treatment regimens were asparaginase IV with 14.57%, cytarabine IV with 10.98%, etoposide IV + cytarabine IV with 10.38%, intrathecal triple methotrexate + cytarabine + dexamethasone with 8.78%, cytarabine iv 2v / day...