Fig. 3

Immunohistochemical features of microcystic urothelial carcinoma. The tumor cells exhibited expression of GATA3 (a), FOXA1 (b), CK5/6 (c, basal location), CD44 (d, basal location), p63 (e, basal location), and MUC5AC (f, luminal location). PASD staining revealed mucus in the microcysts and cytoplasm (g). In most cases, TERT-C228T promoter mutations were detected using the ADx Sanger sequencing platform (h)