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Increased risk for ovarian cancer can also come from your father's side.

A family history of some other types of cancer such as colorectal and breast cancer is linked to an increased risk of ovarian cancer.

Women who have been pregnant and carried it to term before age 26 have a lower risk of ovarian cancer than women who have not. Women who have their first full-term pregnancy after age 35 or who never carried a pregnancy to term have a higher risk of ovarian cancer. Women who have used oral contraceptives (also known as birth control pills or the pill) have a lower risk of ovarian cancer.

The lower risk is seen after only 3 to 6 months of using the pill, and the risk is lower the longer the pills are used.

The risk of some other cancers, such as pancreatic cancer and prostate cancer, are also increased.

Mutations in BRCA1 and BRCA2 are also responsible for most inherited ovarian cancers.

When these genes are normal they help prevent cancer by making proteins that keep cells from growing abnormally (they act as tumor suppressors).

The risk seems to be higher in women taking estrogen alone (without progesterone) for many years (at least 5 or 10).Mutations in BRCA1 and BRCA2 are about 10 times more common in those who are Ashkenazi Jewish than those in the general U. This means that if 100 women had a BRCA1 mutation, between 35 and 70 of them would get ovarian cancer.For women with BRCA2 mutations the risk has been estimated to be between 10% and 30% by age 70.Researchers have discovered several specific factors that change a woman's likelihood of developing epithelial ovarian cancer.

These risk factors don’t apply to other less common types of ovarian cancer like germ cell tumors and stromal tumors. Half of all ovarian cancers are found in women 63 years of age or older.

This lower risk continues for many years after the pill is stopped.