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The exact wavelengths and amount of solar radiation that cause each of the different types of skin cancer are being studied. However, the best way to prevent any type of skin cancer is to protect your skin from the sun.

Developing Sun-Safe Behavior

Parents should protect their children's skin right from the start, and teach their children sun-safe behavior. Severe, blistering sunburns are associated with an increased risk for melanoma. Excessive exposure to sunlight at any time in life increases a person's risk of developing skin cancer. People who experience intermittent exposure to high levels of UV radiation appear to be at greater risk than are those who experience continual exposure to lower levels, even if the total dose of UV radiation is the same.

Limiting midday sun exposure is particularly important for individuals with light hair, light eyes, an inability to tan, a family history of any type of skin cancer, or many moles or odd-looking moles.

Covering up with hats and clothing and using a broad-spectrum sunscreen that blocks both UVA and UVB radiation are the best defense against damage caused by normal sun exposure, but are not sufficient to protect the skin during extended periods of sun exposure. Research has demonstrated that sunscreens may help prevent squamous cell carcinoma (a non-melanoma skin cancer), but their effectiveness in preventing melanoma or basal cell carcinoma (the most common form of skin cancer) is not known.

Sunlamps, tanning beds, and tanning booths are another potentially dangerous source of harmful UV radiation that should be avoided.

Detecting the Earliest Signs of Melanoma

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Regular head-to-toe skin examinations are the key to diagnosing melanoma at its earliest stage, when it is most easily cured. During a skin examination, a clinician will look for any changes in the appearance of moles that could indicate cancer. Signs of skin cancer, often called the ABCDEs of skin cancer detection, may include moles that have an Asymmetrical shape, an uneven Border, more than one Color, changing Diameter, and appear to be Evolving or changing over time.

Clinicians will also teach patients how to conduct self-examinations of their skin, including how to look for moles that have changed in appearance. Conducting a complete and deliberate skin self-exam may significantly improve the chance of early detection and successful treatment of skin cancer. People who examine their skin regularly are more likely to notice changes in the appearance of their moles and bring them to the attention of a doctor, who will perform the appropriate diagnostic tests. To learn more, visit our Screening Guidelines for skin cancers.

For people who are at higher-than-average risk for melanoma because of personal or family history or because they have a large number of moles, Memorial Sloan-Kettering offers a more intensive surveillance program, which includes a Digital Imaging Screening Program. In this program, a digital photographic record of a patient's skin is created and stored. When a patient returns for subsequent appointments, any suspected change in a mole can be verified by an immediate comparison to the prior computerized photographic record.

Toward Individualized Risk Assessment

Precisely how genes interact with the environment to increase any one person's risk for melanoma is a key question in cancer research. Although it is clear that UV radiation can damage DNA, and that high levels of sun exposure are associated with melanoma risk, the exact relationship between UV exposure and melanoma remains unclear.

GEM Study Map
Incidence of melanoma varies significantly among the nine sites of the Genetics and Environment in Melanoma (GEM) study, owing to variations in sunlight intensity and differences among populations.

Memorial Sloan-Kettering researchers are leading an international collaboration to investigate the genetic and environmental factors that underlie susceptibility to melanoma. Sponsored by the National Cancer Institute, the project adds an important genetic component to classical epidemiology. Our researchers aim to define the genetic factors that make some people more likely than others to develop melanoma. The project is focusing on mutations in genes that protect the body from the effects of UV radiation and genes that regulate the life cycle of cells.


Last Updated: Nov. 12, 2008
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