First, we have observed that PD-L1–CAR T cells, but not the control treatment (ie, phosphate-buffered saline (PBS), unmodified T cells, and CD19–CAR T cells), induced significant retardation of MDA-MB-231 tumor growth (figure 4D, left-hand panel and online supplemental figure 4I) and prolonged mouse survival (as assessed by reaching the predefined tumor volume; figure 4D, right-hand panel). The gene discussed is CD19; the disease is neoplasm.