This document discusses the feasibility of using CD19 CAR T-cell therapy in patients with cardiac lymphoma. The article highlights that cardiac non-Hodgkin lymphoma is not well-represented in medical literature, and the exact incidence is unknown. The authors present three cases of patients with cardiac lymphoma who received CAR T-cell therapy. The first two patients had successful outcomes with no significant cardiac events, while the third patient experienced severe cardiotoxicity after CAR T infusion. The authors suggest that a multidisciplinary approach and preventive measures for severe cytokine release syndrome are important in optimizing the safety and efficacy of CAR T-cell therapy in patients with cardiac lymphoma. [Extracted from the article]