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CA-125 change over time shows promise as screening tool for early detection of ovarian cancer
Date:8/25/2013

e diagnosed with advanced disease.

"Finding a screening mechanism would be the Holy Grail in the fight against ovarian cancer, because when caught early it is not just treatable, but curable," said Lu, also the trial's principal investigator.

For the prospective, single-arm, 11-year study, 4,051 women were enrolled from seven sites across the country, with MD Anderson serving as the lead site. All were healthy, post-menopausal women, ages 50-74, with no strong family history of breast or ovarian cancer. The study's primary endpoint was specificity, or few false positives. In addition, the study looked at the positive predictive value, or the number of operations required to detect a case of ovarian cancer.

Each woman received a baseline CA-125 blood-test. Using the Risk of Ovarian Cancer Algorithm (ROCA), a mathematical model based on the patient's age and CA-125 score, women were stratified to one of three risks groups, with the respective follow-up: "low," came back in a year for a follow-up blood test; "intermediate," further monitoring with repeat CA-125 blood test in three months; and "high," referred to receive transvaginal sonography (TVS) and to see a gynecologic oncologist.

Based on the women's CA-125 change over time, the average annual rate of referral to the intermediate and high groups were 5.8 percent and .9 percent, respectively. Cumulatively, 85 women (2.9 percent) were determined to be high risk, and thereby received the TVS and were referred to a gynecologic oncologist. Of those women, 10 underwent surgery: four had invasive ovarian cancer; two had borderline disease; one had endometrial cancer and three had benign ovarian tumors a positive predictive value of 40 percent, which greatly surpasses the clinical benchmark of 10 percent, say the researchers. The specificity of the test was 99.9 percent, explained Lu. The screening failed to detect two borderline ovarian cancers.

Of great importance, said
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Contact: Laura Sussman
lsussman@mdanderson.org
713-745-2457
University of Texas M. D. Anderson Cancer Center
Source:Eurekalert

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