Patients with refractory/relapse hematologic oncology disease may benefit from innovative therapy such as Car-T cells. Factors strongly predictive of outcome and response are unknown. Extracellular vesicles are recognized as a mode of intercellular communication and are reminiscent of the cell of origin. They are currently candidates to be biomarkers for this biomarker of phenomena occurring in tissues. The working hypothesis is that they may be predictive of outcome and toxicity, as some preliminary data have suggested.

Therefore, the aim of the study concerns I dentification of potential CAR-EV biomarkers associated with neurological toxicity after infusion of CAR-T cells.

Inclusion Criteria:

• patients affeccted by any hematological malignancies (r/r B cell lymphoma, B cell acute leukemia and multiple myeloma) undergoing (or whit indication to) CAR-T cell infusion with a CAR-T cell product;
• age: 18 years or greater;
• obtained written consent to the study participation.

Exclusion Criteria:

• none

This study will include all patients who will undergo to CAR-T cell infusion per any hematological malignancies with AIFA approved CAR-T cell product.