Collaborative Group on Epidemiological Studies of Ovarian Cancer
The Collaborative Group on Epidemiological Studies of Ovarian Cancer includes data on 30,000 women with ovarian cancer from 45 studies worldwide. The first analyses, published in 2008, showed that use of hormonal contraceptives confers long-lasting protection against ovarian cancer. Further analyses are planned on hormonal factors such as use of hormone replacement therapy and reproductive factors.
Collaborators first met in 2005, and agreed that the first major report should be on the long term effects of oral contraceptives. Overall, oral contraceptives were found to cause a persistent reduction in ovarian cancer risk, with the protection being greater the longer the duration of use (Beral et al, 2008). Thus some 200,000 ovarian cancers have already been prevented worldwide by women’s past use of oral contraceptives.
See publications for the Collaborative Group on Epidemiological Studies of Ovarian Cancer.