FN1 and nonpapillary renal cell carcinoma: CAFs in ccRCC express signature genes such as fibroblast activation protein (FAP), leucine—rich repeat—containing (LRRC)15, fibronectin (FN)1, transforming growth factor beta induced (TGFBI), and thyroid—stimulating hormone (THY)1, and it has been observed that these expressions correlate with patient outcomes [175].