TACSTD2 and nonpapillary renal cell carcinoma: IHC revealed moderate to strong membranous TROP-2 expression in most pRCC cases [n = 20/22 with H-score ≥ 100, median H-score 265 (IQR 202.5–290)], while TROP-2 expression was absent or weak in ccRCC and chRCC (p < 0.0001).