Objective
Differentiation of an adrenal from an ovarian source of hyperandrogenemia can be challenging. Recent studies have highlighted the importance of 11-oxygenated C19 steroids to the androgen pool in humans. The aim of this study was to determine the origin of 11-oxygented androgens in females and to explore their potential use in the diagnostics of hyperandrogenic disorders.
Methods
We measured testosterone and its precursors (dehydroepiandrosterone-sulfate and, androstenedione) and 11-oxygenated androgens (11-hydroxyandrostendione (11-OHA4) and, 11-ketotestosterone (KT)) in the periphery, adrenal and ovarian veins in four different cases of hyperandrogenism in females (polycystic ovary syndrome (PCOS), primary bilateral macronodular adrenal hyperplasia (PBMA), Sertoli-Leydig cell tumor, and ovarian steroid cell tumor).
Results
Two patients demonstrate excessive testosterone (T) secretion in neoplastic ovarian tumors which was not paralleled by a significant secretion of 11-oxygenated androgens as determined by adrenal and ovarian vein sampling. In androgen-secreting bilateral adrenal macronodular hyperplasia, steroid profiles were characterized by elevated 11-KT and 11-OHA4 concentrations in adrenal veins and the periphery. In the patient with PCOS, peripheral 11-KT concentrations were slightly elevated in comparison to the other patients but the 11-KT and 11-OHA4 concentrations were comparable in ovarian veins and in the periphery.
Conclusion
This study confirms that 11-OHA4 and 11-KT are not synthesized by the ovary. We propose that the T/11-KT ratio as well as 11-OHA4 could help identify predominant adrenal androgen excess and distinguish neoplastic and non-neoplastic ovarian androgen source.