PROM1 and nonpapillary renal cell carcinoma: Similar to in situ CD133+cells, selective ligation of TNFR2 by R2TNF and wtTNF (but not R1TNF) induced pSTAT3Ser727 but not pSTAT3Ty705 in vitro in isolated CD133+cells from both ccRCC and NK, but the expression was more pronounced in ccRCC‐CD133+CSCs.