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  • Title: Multiple immunoreactive inhibin proteins in serum from postmenopausal women with epithelial ovarian cancer.
    Author: Lambert-Messerlian GM, Steinhoff M, Zheng W, Canick JA, Gajewski WH, Seifer DB, Schneyer AL.
    Journal: Gynecol Oncol; 1997 Jun; 65(3):512-6. PubMed ID: 9190984.
    Abstract:
    Inhibin is an ovarian protein previously shown, using a nonspecific assay, to be elevated in serum of women with ovarian cancer. However, inhibin is secreted in multiple biochemical forms, including dimeric inhibin A and B and alpha inhibin precursors (pro-alphaC), each of which can now be specifically measured. We have examined the secretion of inhibin B and pro-alphaC inhibin in serum from women with epithelial ovarian cancer (EOC) for the first time, and have compared these analytes to inhibin A and total inhibin (inhibin A + B + pro-alphaC) as potential serum markers for EOC in postmenopausal women. Of all the immunoreactive inhibin proteins studied, the best serum marker was pro-alphaC, with 22% of women with EOC having levels that exceeded the range of values in women without EOC. Since CA 125 and pro-alphaC levels were not significantly correlated, combination of these markers resulted in 87% of EOC cases having elevated preoperative serum levels, a 9% increase over CA 125 alone. These data suggest that alpha inhibin secretion, especially pro-alphaC, may be useful in addition to CA 125 as a serum marker for EOC in postmenopausal women.
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