Salvage Therapy With Chemotherapy and Natural Killer Cells in Relapsed/Refractory Paediatric T Cell Lymphoblastic Leukaemia and Lymphoma

Inclusion Criteria: * Patients aged between 0 and 21 years with relapsed or refractary acute lymphoblastic leukemia or T-cell lymphoblastic lymphoma. * Lansky Index \> 60%. * Left ventricular ejection fraction \> 39%. * Negative HIV serology. * Provide informed consent in accordance with current legislation. Exclusion Criteria: * Patients with a history of poor compliance. * Patients not valid after psycho-social evaluation * Severe (4) functional organ disorders (hepatic, renal, respiratory) according to NCI CTCAE v3 criteria