IFT20 and nonpapillary renal cell carcinoma: On the basis of GLI1 and IFT20 expression at the mRNA level, but also at the protein level for IFT20 only (Figure S5), and our previous results in ccRCC cell lines, 14 out of 19 (73.7%) from the previous group A, were found to have a “no primary cilium” signature, whereas 5 out of 19 (26.3%) from the previous group B, were classified with a “primary cilium” signature.