This cluster of papers focuses on Chimeric Antigen Receptor (CAR) T cell therapy, a form of immunotherapy that uses genetically engineered T cells to target and destroy cancer cells. The papers cover various aspects of CAR T cell therapy, including its application in treating leukemia, lymphoma, and solid tumors, the management of cytokine release syndrome associated with this therapy, and the long-term efficacy and safety of CAR T cell treatment.