Is Melanoma hereditary?

While most cases of melanoma are sporadic and caused by environmental factors like UV exposure, approximately 5% to 10% of cases are considered hereditary. In these instances, individuals inherit a genetic predisposition that significantly increases their lifetime risk of developing melanoma compared to the general population.

Is melanoma considered a hereditary condition?

There is an important distinction between genetic and hereditary. All melanoma is genetic because it involves mutations in the DNA of skin cells. However, only a small percentage is hereditary, meaning the mutation is passed through the germline from parent to child. Most hereditary melanoma cases follow an autosomal dominant inheritance pattern, meaning an individual only needs to inherit one altered copy of a gene to have an increased risk.

What genetic factors influence melanoma risk?

When melanoma runs in families, it is often linked to specific high-risk gene mutations. The most well-known gene associated with familial melanoma is CDKN2A. Other genes, such as CDK4, BAP1, and POT1, have also been identified as contributors. It is important to note that inheriting a mutation does not guarantee a diagnosis, but rather indicates a significantly higher susceptibility.

When is genetic testing and counseling recommended?

Genetic testing for melanoma is not recommended for everyone. It is typically reserved for individuals who meet specific clinical criteria, such as:

• A strong family history, typically defined as three or more cases of melanoma in first-degree relatives.


• The presence of multiple primary melanoma tumors in one individual.


• A personal history of melanoma diagnosed at an exceptionally young age.


• The presence of atypical mole syndrome (dysplastic nevi) in multiple family members.

Are de novo mutations common in melanoma?

While hereditary melanoma is passed down, many patients experience "spontaneous" or de novo mutations. In the context of cancer, these are somatic mutations that occur during a person's lifetime due to environmental triggers or errors during cell division. Unlike germline mutations, these de novo somatic mutations are not passed on to offspring.

Next steps

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


• Discuss specialized skin surveillance protocols with your dermatologist if you have a known family history of melanoma.


• Join the 30 members of our DiseaseMaps.org community to share experiences and find support.


• Visit the NIH Genetic and Rare Diseases Information Center (GARD) for updated clinical guidelines.

Medical disclaimer: This information is for educational purposes only and does not replace professional medical advice, diagnosis, or treatment.

References

• National Institutes of Health (NIH) - Genetic and Rare Diseases Information Center (GARD)


• Orphanet: Information on rare diseases and orphan drugs


• Melanoma Research Foundation (MRF)


• OMIM (Online Mendelian Inheritance in Man): CDKN2A and familial cancer syndromes