JAK3 molecule (116 kDa) was detected in TF1β and RPTEC cells, whereas immunoblotting did not detect the kinase in RCC, as well as in MCF-7 and IFN-γ treated U937 control cell lines as previously reported [34], [35] (Figure 1B, lower panel). This evidence concerns the gene JAK3 and renal cell carcinoma.