What is the prevalence of borderline ovarian cancer?

Updated: Mar 18, 2019
  • Author: Andrew E Green, MD; Chief Editor: Warner K Huh, MD  more...
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One woman in 55 (1.8%) develops some form of ovarian cancer in her lifetime. Approximately 90% of these cancers are tumors of epithelial origin. If benign lesions are included, epithelial tumors account for 60% of all ovarian tumors.

In the United States, borderline tumors make up approximately 15% of all epithelial ovarian tumors. The mean age of occurrence is approximately 10 years younger than that of women with frankly malignant ovarian cancer.

In Sweden, the incidence of borderline tumors may be increasing, according to a study. The frequency of these tumors in the population increased from 1 case to 5.3 cases per 100,000 women years from 1960-1964 to 2000-2005. The authors suggested that this change may have been due to a rise in diagnostic activity, as well as by “a lack of protective effect of oral contraception use.” [1]

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