Cytokine profiles after HSCT and CD19 CAR T–cell infusion. Patient serum samples were analyzed with the Luminex IS100 bead array technology, and kits were purchased from Life Technologies (Invitrogen). The assays were performed by Clinical Immunobiology Correlative Studies laboratory (CICSL) at COH using commercially available 30-plex cytokine detection assays. Each data point represents the average of triplicate measurement. (A) Interferon-γ is plotted in pg/mL at weekly time points through day 28. (B) IL-6 is plotted in pg/mL at weekly time points through day 28.