PRF1 and neoplasm: Accumulating on the surface, CAR-T cells then form an immunological synapse with subsequent activation and proliferation of T-cells, infiltration of tumor sites, cytokines secretion, cytolytic degranulation, the release of perforin and granzyme B, and eventual direct lysis of the tumor cell through several kinetics, dependent on the whether the CAR harbors CD4+ or CD8+ T-cells [31].