Immunohistochemical analysis of
cytochromes P-450
aromatase and P-450
17 alpha-hydroxylase, which catalyze the production of
estrogens and
androgens, respectively, was performed for 23 cases of
ovarian Brenner tumor. Immunoreactivity for P-450
aromatase was observed in the epithelial cells of the
tumor distinctly in two cases and faintly in four cases, while immunoreactivity for P-450
17 alpha-hydroxylase was seen in two cases. No immunoreactivity was observed in the stromal cells of the
tumors, nor were luteinized cells observed in the cases examined. No correlation was observed between the immunoreactivity of
cytochromes P-450 in the epithelial cells of the
tumor and endometrial abnormalities. These findings, together with a review of the literature, suggest that the usual
Brenner tumor is not associated with specific steroidogenesis. Rare massive Brenner
tumors may, however, be capable of androgenic or estrogenic activity.