TCF21 and nonpapillary renal cell carcinoma: To investigate whether TCF21 expression results in a reduction in cell proliferation in the context of the ccRCC cell line 786‐O, we performed standard growth curves on the four clones that were pBABE‐mock‐transfected and compared them to standard growth curves from the four clones expressing TCF21 after 2, 4, and 5 days.