Two trials were carried out by Kobayashi’s group in patients with advanced renal cell carcinomas; in one study (66), seven patients received Zoledronate-expanded Vγ9Vδ2 T cells and IL-2 i.v. All patients had mild adverse events, four patients showed a significant in vivo expansion and IFN-γ production by Vγ9Vδ2 T cells, but the clinical benefit was moderate, as only three out of seven patients showed delayed tumor doubling time (66). Here, IFNG is linked to renal cell carcinoma.