COX8A and neoplasm: We then quantified secreted Flt3L and IL7 when CAR T cells were cultured alone or co-cultured with either CT2A-EGFRvIII-Luc (vIII), CT2A-GFP-Luc (2A) or 50% vIII and 50% 2A (vIII+2A) tumor cells.