Is Ovarian cancer hereditary?

Most cases of ovarian cancer occur sporadically, but approximately 10% to 15% of cases are hereditary, resulting from inherited genetic mutations. While ovarian cancer is not always hereditary, individuals with a family history of breast or ovarian cancer may have an increased risk due to specific gene variants.

Is ovarian cancer considered a hereditary condition?

Ovarian cancer is generally not considered a single hereditary disease, but rather a complex condition. While most instances are sporadic (caused by mutations acquired during a person's lifetime), a significant subset of ovarian cancer cases is linked to inherited germline mutations. These hereditary cases typically follow an autosomal dominant inheritance pattern, meaning an affected parent has a 50% chance of passing the mutation to each child.

Which genes increase the risk of ovarian cancer?

The most well-known genetic contributors to hereditary ovarian cancer involve mutations in the BRCA1 and BRCA2 genes. Other syndromes, such as Lynch syndrome (Hereditary Non-Polyposis Colorectal Cancer), also elevate risk. Key facts regarding genetic risk include:

• BRCA1 mutations: Associated with a 35% to 46% lifetime risk of developing ovarian cancer.


• BRCA2 mutations: Associated with a 13% to 23% lifetime risk of developing ovarian cancer.


• Lynch syndrome: Increases the cumulative risk of ovarian cancer by approximately 3% to 12% depending on the specific gene involved (e.g., MLH1, MSH2).

When is genetic testing recommended for ovarian cancer?

Genetic testing for ovarian cancer is recommended for all women diagnosed with invasive epithelial ovarian cancer, regardless of family history. Testing helps guide treatment decisions, such as the use of PARP inhibitors. For unaffected individuals, genetic counseling is advised if there is a strong family history of breast or ovarian cancer, as this allows for proactive screening and risk-reduction strategies.

Are de novo mutations common in ovarian cancer?

De novo (spontaneous) mutations that lead to hereditary ovarian cancer are relatively rare compared to inherited mutations. Most hereditary cases are passed down through families, though it is possible for a mutation to appear for the first time in an individual due to a new germline change.

Next steps

• Consult with a board-certified genetic counselor to review your family pedigree.


• Discuss genetic testing options with an oncologist if you have been diagnosed with ovarian cancer.


• Connect with the 60 members of the DiseaseMaps.org community who are managing ovarian cancer to share experiences.


• Review your family health history to identify patterns of cancer across multiple generations.

Medical disclaimer: This information is for educational purposes only and does not constitute medical advice, diagnosis, or treatment; always consult with your healthcare provider regarding your specific clinical situation.

References

• National Cancer Institute (NCI): Genetics of Breast and Gynecologic Cancers.


• NIH Genetic and Rare Diseases (GARD) Information Center.


• National Comprehensive Cancer Network (NCCN) Guidelines for Genetic/Familial High-Risk Assessment.


• Orphanet: Hereditary Ovarian Cancer.