Chimeric-antigen-receptor (CAR) T cells targeting CD19 show dramatic remissions in refractory or relapsed acute lymphoblastic leukemia. Interleukin-6 (IL-6) has been associated with severe cytokine release syndrome (CRS) following CAR T cell treatment, leading to significant toxicity and death. CRS could be treated with an antiIL6-receptor antibody, with reversal of most of the inflammatory res...