Cytokine release by CAR-transduced T cells. CAR-transduced T cells (vectors listed, x-axis) were incubated with irradiated CD22-high (Raji, column 1), CD22-low (NALM6-GL, column 2), or CD22-negative (K562, column 3) leukemia cell lines at a ratio of 10:1 for 24 hours and culture supernatants analyzed for IFN-γ (top row), IL-2 (second row), and TNF-α (third row). Averages and SD of triplicate wells are shown.