Anti-FcμR and anti-CD19 CAR T cells suppress growth of Mec-1 cells with similar efficiency in a xenogenic mouse model. Mec-1 cells (5 × 10⁶/mouse) were intravenously coinjected with human CAR T cells (3 × 10⁶/mouse) or without T cells for control into Rag2^−/− cγ^−/− mice (n = 7 per group). Mice were inspected every 1 to 3 days for neurological symptoms due to outgrowth of injected Mec-1 cells. Disease-free survival was recorded; data were presented in a Kaplan-Meier plot (anti-FcμR CAR T cells vs w/o T cells, P < .01; anti-CD19 CAR T cells vs w/o T cells, P < .01 as determined by the Log-rank test).