<prompt> Mostly granulosa cell tumors are benign. Marker for granulosa cell tumor is:CA 19-9CA 50InhibinTeratoma  <response>: Granulosa Cell Tumor: Most are benign; however, between 5 and 25 are malignant. The tumors can produce estrogen, thus leading to endometrial hyperplasia and cancer. Microscopic morphology of granulosa cell tumor shows Call-Exner bodies appear similar to ovarian follicle, and produce inhibin, which can be identified in serum and by immunohistochemistry. Ref: Wyatt C., Moos P.J., Brown T.G. 2008. Chapter 17. Pathology of the Male and Female Reproductive Tract and Breast. In C. Wyatt, P.J. Moos, T.G. Brown Eds, Pathology: The Big Picture. 