CTLA4 and neoplasm: Theresults showed that 120 h ofstimulation with tumor cells (HepG2) significantly promoted the proliferation of CFSE-labeled DC-CIK cells in the DC-CIK + Nb36 group, promoting it far more than in the DC-CIK (p < 0.001) and DC-CIK + CTLA-4 mAb (p < 0.05) groups (Fig. 3A-B).