Mathías Rivas, 7, was diagnosed with type B acute lymphoblastic leukemia when he was 10 months old. His leukemia is 15% that does not respond to chemotherapy or bone marrow transplant.

The CRIS foundation has invested more than 71 million euros in the CRIS Advanced Therapies Research Unit of the La Paz Hospital. The therapy he has received, also based on CAR-T, is not even approved and has been applied through what is called compassionate use, the prescription of drugs not yet approved.