Sunlight and Skin Care
The truth is
Melanoma skin cancer is the most aggressive of the three major categories of skin cancer, accounting for only 5 percent of all skin cancer cases each year, but responsible for a majority of skin cancer fatalities (Approximately 8,000 annually).
While melanoma has captured a great deal of public attention in the past 15 years, much of the discussion has been oversimplified in stating that melanoma is caused by overexposure to sunlight. In fact, the exact nature of the relationship between melanoma and ultraviolet light remains unclear, and the mechanism by which the two are related is still unknown – which is why some independent dermatology researchers even question whether the two are related at all.
- While it is believed that melanoma is somehow related to ultraviolet light exposure, this relationship is not straight-forward and the photobiology research community still does not know how it works. That’s because while a minority of associative survey-studies have suggested a correlation between UV from indoor tanning and melanoma, no direct experimental evidence exists to show a causative connection. Even American Academy of Dermatology spokesperson Dr. James Spencer admits, "We don’t have direct experimental evidence" connecting indoor tanning and melanoma.
- Melanoma is more common in people who work indoors than in those who work outdoors, and those who work both indoors and outdoors get the fewest melanomas. Because this is true, the relationship between melanoma and sunlight cannot possibly be clear-cut. If it were a clear-cut relationship, outside workers would have higher incidence than inside workers. But the opposite is true.
- Melanoma most commonly appears on parts of the body that do not receive regular exposure to sunlight. Again, because this is true, the relationship between melanoma and sunlight cannot be clear-cut. If it were, melanomas would appear most often on parts of the body that receive the most sunlight.
- 18 of 23 epidemiological studies ever conducted attempting to correlate indoor tanning and melanoma incidence show no statistically significant association – including the largest independent study, a 2005 multi-ethnic international European study which reported, "The relationship between UVR and melanoma is very complex and, despite many studies on the topic, remains a controversial issue. Some patterns of sun exposure may also offer protection, as some studies have suggested that people with heavy occupational exposure to the sun exhibit a lower risk for melanoma compared to individuals with intermittent sun exposure. In conclusion, sunbed and sun exposure were not found to be significant risk factors for melanoma in this case–control study performed in five European countries."
- A 2009 opinion paper published by an ad-hoc working group representing the World Health Organization’s International Agency for Research on Cancer has been widely misrepresented in the media. That report’s actual conclusion stated, "Epidemiologic studies to date give no consistent evidence that use of indoor tanning facilities in general is associated with the development of melanoma or skin cancer." While the report attempted to suggest that performing a meta-analysis of the old data showed a 75 percent increased risk for those who started tanning at an early age, the authors failed to disclose that conclusion failed to take into account that removing those with skin so fair it cannot tan – called Skin Type I – from the analysis made the overall results statistically insignificant.
- Dr. William Grant, founder of the Sunlight, Nutrition and Health Research Center in San Francisco, published a peer-reviewed critique of the IARC report showing that, after adjusting for skin type, the analysis showed no increased risk with indoor tanning.
- Closer analysis of IARC report data (by Dr. Mia Papas and Dr. Anne Chappelle) – when separated by unsupervised home tanning equipment verses usage in indoor tanning facilities and medical usage of tanning equipment in doctor’s offices – reveals that no statistically significant increase in risk (6 percent) was attributable to commercial tanning facility usage, while larger increases (40 percent and 96 percent) were attributable to home and medical usage of tanning equipment.
- A 2010 University of Minnesota study on fair-skinned Minnesotans claimed to show a connection between tanning and melanoma but actually supported Grant’s point that UV-related risk seems centered on the fairest skin type. But the study also showed that those who got the most outdoor sun exposure had the lowest risk of melanoma – a divergent conclusion to the rest of the paper underscoring that whatever relationship UV and melanoma may have is still not understood.
- The relative risk of melanoma is very small – much less than 1 percent and very close to the relative risk for non-tanners – and is often misreported. As reported in the Wilmington News Journal, "Even the IARC’s strongest study – which followed more than 100,000 women over eight years – found that less than three-tenths of one percent who tanned frequently developed melanoma, while less than two-tenths of one percent who didn’t tan developed melanoma. Almost all the other studies in the report did not establish a strong link between the two. The overall risk of contracting melanoma – whether using tanning beds or not – remains well under 1 percent. For that reason, using the 75 percent statistic is misleading, said Dr. Lisa M. Schwartz, general internist at Veterans Affairs Medical Center in VT and co-author of "Know Your Chances," a book on understanding health statistics..."Melanoma is pretty rare and almost all the time, the way to make it look scarier is to present the relative change, the 75 percent increase, rather than to point out that it is still really rare."
- "Absolute risk just tells you the chance of something happening, while relative risk tells you how that risk compares to another risk, as a ratio. If a risk doubles, for example, that’s a relative risk of 2, or 200 percent. If it halves, it’s .5, or 50 percent. Generally, when you’re dealing with small absolute risks, as we are with melanoma, the relative risk differences will seem much greater than the absolute risk differences. You can see how if someone is lobbying to ban something – or, in the case of a new drug, trying to show a dramatic effect – they would probably want to use the relative risk."-Ivan Oransky, M.D.
- The American Cancer Society’s key document measuring cancer rates in the United States – "Cancer Facts and Figures" – says that melanoma rates have not increased since 2000 and that rates are declining for women under age 50 - the opposite of what anti-tanning lobbying groups claim. "During the 1970's, the incidence rate of melanoma increased rapidly by about 6 percent per year. However, from 1981-2000, the rate of increase slowed to 3 percent per year and since 2000 melanoma incidence has been stable," the ACS "Cancer Facts and Figures 2008" reports. "The death rate for melanoma has been decreasing rapidly in whites younger than 50, by 3 percent per year since 1991 in men and by 2.3 percent per year since 1985 in women."
- A paper published by the British dermatology community in 2009 showed that "diagnostic drift" and more aggressive screening are responsible for the increase in "reported" melanomas, but that there isn’t an actual increase in thick melanoma lesions, which explains why the mortality rate is not increasing. According to the authors, "These findings should lead to a reconsideration of the treatment of ‘early’ lesions, a search for better diagnostic methods to distinguish them from truly malignant melanomas, re-evaluation of the role of ultraviolet radiation and recommendations for protection from it, as well as the need for a new direction in the search for the cause of melanoma.
- Many scientists and dermatologists have taken firm positions that melanoma's connection to UV light is unclear or doesn't exist at all. Dr Bernard Ackerman – a pioneer in dermatology pathology who was recognized as a master dermatologist by the American Academy of Dermatology – the Academy’s highest honor – insists there is no evidence connecting UV and melanoma in his monograph, "The Sun and the Epidemic of Melanoma: Myth on Myth. According to Ackerman:
- "The American Academy of Dermatology, for decades, has kept up a drumbeat on behalf of faith in an epidemic of melanoma and rays of the sun as the major cause of it, at the same time that it has flayed, incessantly, the tanning bed industry. Although the organization is termed an Academy, never has it presented in fashion academic a whit of evidence, available readily, contrary to its position entrenched, namely, there is no epidemic of melanoma and that tanning beds have not been proven to be a cause direct of melanoma."
- "There is no proof whatsoever that blistering sun-burns, no matter the number and even in childhood, enhance risk for development of melanoma and there is no evidence at all that sunscreens prevent development of melanoma. What is more, it has yet to be established that exposure excessive to sunlight (or sun lamps and tanning beds) alone, in the absence of inclination genetic, causes melanoma."
- Dr. Sam Shuster, Emeritus Professor of Dermatology at the University of Newcastle, penned "The Skin Cancer Cover-Up" to point out that there is no hard evidence that UV is the cause of melanoma or that there is an actual increase in melanoma incidence.
- Dr. Arthur R. Rhodes, Professor of Dermatology at Rush Medical College, in Chicago, believes that melanoma’s public message needs to stop focusing on UV light – pointing out that UV-melanoma campaigns are killing people who get melanoma who failed to recognize the disease because they never spent time in the sun.