IL2 and neoplasm: We also tested the levels of proinflammatory cytokines by ELISA and ELISPOT IFN-γ production after incubation with FAP− HepG2 tumor cells, and no significant changes in IL-2 or IFN-γ secretion (Additional file 1: Figure S6A, B) or the IFN-γ response (Additional file 1: Figure S6C, D) were observed.