May is Skin Cancer Awareness Month
Did you know that 5-10% of melanomas are familial?
Even though melanomas account for only 1% of skin cancers, an estimated 106,110 people will develop one this year.1 And while ultraviolet (UV) light exposure, be it from the sun or a tanning bed, is one of the most common risk factors for this aggressive form of skin cancer, family history can also play a role.
Patients with familial melanoma inherit gene mutations that increase their risk of developing melanoma. Natera offers genetic testing for melanoma-predisposing genes as part of its Empower Hereditary Cancer Test. This Skin Cancer Awareness Month, we highlight the genes that predispose individuals to familial melanoma.
Melanomas are considered familial if they occur in at least two first-degree relatives or at least three relatives on the same side of the family. Familial melanomas manifest when individuals inherit melanoma-predisposing gene mutations. These mutations are outlined below from Rossi and colleagues’ more in-depth review2.
The tumor suppressor gene CDKN2A was the first melanoma-predisposing gene identified. CDKN2A mutations are found in 10-20% of high-risk families, where they impair cell cycle arrest.
CDK4 was discovered second, and its prevalence is far less than that of CDKN2A. CDK4 is an oncogene whose gene product directly interacts with p16, the gene product of CDKN2A. Put more simply, CDKN2A and CDK4 affect the same general pathway, albeit through different means.
Mutations in BAP1 can also predispose individuals to melanoma. Not only that, BAP1 mutations can predispose individuals to a wide variety of cancers, including those of the eye, skin, and kidneys. In fact, there is a name for this heritable condition: BAP1 tumor predisposition syndrome.3
Next-generation sequencing enabled the discovery of two melanoma-predisposing genes with intermediate penetrance: MC1R (melanocortin 1 receptor) and MITF (microphthalmia-associated transcription factor). MC1R mutations appear to impact melanoma susceptibility in multifaceted ways. By contrast, a single mutation in MITF can predispose individuals to melanoma by promoting the survival and proliferation of skin cells.
Empowering Melanoma Risk Assessment
The Empower Hereditary Cancer Test can be used to test for the multiple melanoma-predisposing genes. For example, Empower can test for CDKN2A, CDK4, BAP1, and MITF as part of its 40-gene multi-cancer panel, which spans actionable hereditary cancer genes across 8 cancer types.
As an integral component of the genetic testing journey, genetic counseling is recommended for patients seeking genetic testing.4 To help patients better understand what genetic testing means for them, Natera offers pre- and post-test genetic counseling sessions via its board-certified genetic counselors.
Natera is committed to making high-quality hereditary cancer testing accessible for you and your patients. Visit here to learn more about melanoma prevention and early screening : https://www.natera.com/skin-cancer-melanoma-awareness-month/
2Rossi M, Pellegrini C, Cardelli L, et al. Familial Melanoma: Diagnostic and Management Implications. Dermatol Pract Concept. 2019;9(1):10-16.
3Pilarski R, Carlo M, Cebulla C, et al. BAP1 Tumor Predisposition Syndrome. 2016 Oct 13 [Updated 2020 Sep 17]. In: Adam MP, Ardinger HH, Pagon RA, et al., editors. GeneReviews. Seattle (WA): University of Washington, Seattle; 1993-2021. Available from: https://www.ncbi.nlm.nih.gov/books/NBK390611/
4Genetic Counseling and Testing for People at High Risk of Melanoma. August 2019. https://www.cancer.org/cancer/melanoma-skin-cancer/causes-risks-prevention/genetic-counseling-and-testing-for-people-at-high-risk-of-melanoma.html