CD19 and neoplasm: While media of CD19-ENG T cells contained 129.4 ± 79.0 ng/ml CD19-ENG molecules (range 39.7–223 ng/mL; 95%CI 46.6–212.3), no CD19-ENG molecules were detected in media from T cells secreting an ENG specific for an irrelevant tumor antigen (EphA2-ENG T cells; Fig. 1e,f).