Which are the causes of Melanoma?

TL;DR: Melanoma is primarily caused by DNA damage in melanocytes—the pigment-producing cells of the skin—often triggered by cumulative or intense ultraviolet (UV) radiation exposure. While UV light is the leading environmental cause, the development of Melanoma is a complex interplay between these environmental triggers and an individual's underlying genetic susceptibility.

What causes the development of Melanoma?

At its core, Melanoma occurs when DNA mutations in melanocytes cause these cells to grow uncontrollably, forming cancerous tumors. Think of these mutations as "typos" in the cell's instruction manual; when enough of these errors accumulate, the cell loses its ability to regulate its own growth. While UV radiation from the sun or tanning beds is the most significant external trigger, Melanoma can also arise due to internal genetic factors that make certain individuals more prone to these cellular "typos."

What role does genetics play in Melanoma?

Genetic factors are critical, as approximately 10% of Melanoma cases occur in individuals with a family history of the disease. Researchers have identified several key genes associated with increased risk, including:

• CDKN2A: The most common high-penetrance gene associated with familial Melanoma.


• BRAF: Mutations in this gene are found in roughly 50% of cutaneous Melanoma cases.


• MC1R: Variants in this gene, often associated with fair skin and red hair, significantly increase sensitivity to UV radiation.

What is the difference between causes and risk factors?

In medical terms, a "cause" is the direct mechanism leading to the disease (DNA mutation), whereas "risk factors" are conditions that increase the likelihood of that cause occurring. For Melanoma, risk factors include having more than 50 common moles, atypical (dysplastic) nevi, a history of severe blistering sunburns, and a weakened immune system. Understanding these distinctions helps clinicians better identify who may benefit from increased surveillance.

Is our understanding of Melanoma etiology complete?

While the link between UV exposure and Melanoma is well-established, research is ongoing to understand why some individuals develop the disease without significant sun exposure. Current studies are investigating the role of the skin microbiome, metabolic pathways, and epigenetic changes in tumor progression to develop more targeted therapies.

Next steps

• Schedule an annual full-body skin examination with a board-certified dermatologist.


• Perform monthly self-exams using the "ABCDE" rule (Asymmetry, Border, Color, Diameter, Evolution) to monitor existing moles.


• Connect with the 30 members of our DiseaseMaps.org Melanoma community to share experiences and coping strategies.

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

References

• NIH Genetic and Rare Diseases Information Center (GARD): Melanoma


• American Cancer Society: What Causes Melanoma Skin Cancer?


• Melanoma Research Foundation (MRF)


• OMIM (Online Mendelian Inheritance in Man): Cutaneous Malignant Melanoma