In benign, PIN, and PCa samples that have been microdissected into epithelial and adjacent stroma, FOXA1 is found exclusively in epithelial cells and increases in PCa compared to benign, GATA2 is predominately in epithelial cells, while AP1 components JUN and FOS are higher in stroma compared to epithelial (Fig. 3B). The gene discussed is FOS; the disease is prostate intraepithelial neoplasia.