CD19 and neoplasm: Real-time analysis of the proliferative potential of H522(Kat+CD19+), PC-3M(Kat+CD19+), A431(Kat+CD19+), and MDA-MB-231(Kat+C19+) cells using the xCELLigence biosensor system demonstrated a substantial decrease in the number of tumor cells after the addition of CAR-T cells, compared with the control non-modified H522 and PC-3M cells.