Il-6 is non-essential to murine CD19 CAR efficacy, but can mediate acute GVHD following allogeneic BMT with CAR T cell infusion. Issue 2 (December 2015) - Jacoby, Elad; Qin, Haiying; Kochenderfer, James; Yang, Yinmeng; Chien, Chris; Fry, Terry