Lynch syndrome increases the risk of many different types of cancer, including ovarian cancer. The exact level of risk depends on which gene contains the mutation.
Overall, ovarian cancer is rare. The American Cancer SocietyTrusted Source estimates that 1 in 78 (1.2%) of people with ovaries will develop ovarian cancer during their lifetime. Additionally, more than half of people receive a diagnosis at age 63 or older.
In contrast, people with Lynch syndrome have a 3% to 17% lifetime risk of developing ovarian cancer. They also often develop cancer at a younger age than people without Lynch syndrome.
https://www.healthline.com/health/ovarian-cancer/lynch-syndrome-ovarian-cancer#ovarian-cancer-risk
Lynch Syndrome Ireland 