POU5F1 and neoplasm: (Pro)renin receptor (Figures 2A–C, red) was expressed by the EMA+ (Figure 2A, green) cells within the tumor nests, as well as the CD34+ endothelium (Figure 2B, green, arrows) and the outer pericyte layer (Figure 2B, red, arrowheads) of the microvessels and OCT4+ (Figure 2C, green) cells within the peri-tumoral stroma (16).