Using variable concentrations (E:T ratios) of GW‐9662 with CIK cells, we found that the CIK cells exert cytotoxic effect in both glioblastoma and neuroblastoma cells which is further enhanced significantly owing to the synergistic effect of the PPARγ inhibitor (Figure 1E, p ≤ 0.0001). This evidence concerns the gene PPARG and neuroblastoma.