NECTIN4 and urothelial carcinoma: Ghali F. et al. found nectin-4 to exhibit a positive membrane and cytoplasmic expression in urothelial carcinoma (UC), plasmacytoid urothelial carcinoma (UC PUC), and urothelial carcinoma with squamous differentiation (UCSD), with significantly higher cytoplasmic expression compared to membrane expression in UC PUC and UCSD types.