Figure 1.

Dual p63/P501S immunohistochemical stain. A. Benign prostate glands with foci of basal cell hyperplasia showing red granular perinuclear cytoplasmic P501S staining and diffuse brown nuclear p63 staining of basal cell layer (X200.); B. Prostate cancer with red perinuclear cytoplasmic P501S staining and no brown nuclear p63 staining (X400); C. Urothelial carcinoma with diffuse brown nuclear p63 staining and absence of red P501S staining (X400).