Article on sun and cancer

[KEND]

Part of an article on sun, cancer and sunscreen

While dermatologists and sunscreen manufacturers have made it their mission to convince the world that sun exposure causes cancer, this is all a big lie. Sunlight is not the primary cause of skin cancer. In fact, sunlight actually prevents cancer!
Considerable evidence shows that vitamin D (which is produced from the sun’s rays), is protective of many cancers. This includes the deadliest of skin cancers – melanoma. In addition to melanoma, there are at least 13 other cancers that seem to be positively affected by sunlight. Most notably are breast cancer, colon cancer, and ovarian cancer.
Sun Exposure Does NOT Cause Melanoma
While melanoma accounts for less than 2% of skin cancer cases, it can metastasize to other organs and become very aggressive. It is responsible for the majority of skin cancer deaths. However, researchers have found that that sunlight does not cause melanoma.
Dr. Daniel Coit, surgical oncologist at Memorial Sloan Kettering Cancer Center (MSKCC), shared his research on melanoma at a 2012 MSKCC Health Education Seminar. Dr Coit presented some startling evidence and cleared up important myths regarding melanoma.
He surprised the audience when he said that most melanomas are not related to sun exposure, and therefore sunblock or avoiding sun exposure does not prevent melanoma. Dr. Coit explained how melanoma is directly related to family history and called it a disease of gene mutations.
A British review done in 2002 also had some interesting findings. Overall the results provided no clear link between sunscreen use and the prevention of melanoma. While two studies did show a protective effect, three studies showed a negative association. Meaning there was a significant increase in malignant melanoma with sunscreen use.
Dr. David Mitchell, PhD, professor at M.D. Anderson’s department of Carcinogenesis, found via a fish study that UVA does not cause melanoma and is not responsible for the rise in the incidence of melanoma over the past 30 years.
How Sunlight Prevents Cancer
On the contrary, countless studies have shown that sun exposure actually reduces the risk of skin and other cancers.
How does sunlight reduce the risk of cancer? c
Vitamin D increases cell differentiation, suppresses growth signals, reduces cell proliferation, reduces the effect of IGF-1(insulin- like growth factors) on cancer progression, and inhibits angiogenesis (formation of new blood vessels in tumors). Therefore, it is more likely that low vitamin D levels account for the rise in skin cancer incidences. In fact, numerous studies show that low vitamin D status may actually contribute to the development of cancers of the skin, breast, colon, ovaries, and others.
Here are just a few of the studies:
According to Dr. William B. Grant, PhD, epidemiologist and founder of Sunlight, Nutrition and Health Research Center, insufficient sun exposure will likely result in the deaths of over 50,000 Americans each year. In one of Dr. Grant’s studies he showed that mortality rates of 17 types of cancer were inversely correlated with vitamin D from sun exposure. The study also showed that vitamin D reduces the risk of melanoma. Another of his studies found that UVB reduces the risk of 16 types of cancer in the United States.
A 2003 study published in the Journal of Investigative Dermatology showed that sun exposure had an inverse relationship to melanoma risk. Those who had been exposed to more sun during their lifetime had a reduced risk of melanoma.
Research performed at the University of Leeds found that melanoma patients with the lowest vitamin D levels had the poorest prognoses. Conversely, melanoma patients who had high levels of sun exposure (and thus higher D levels) were less likely to die from the disease than those who stayed out of the sun.
In a study of 3,000 individuals with non-Hodgkin’s Lymphoma, individuals who were exposed to UV rays lowered their risk of developing cancer by 30-40%.
Two 2005 studies cited by the British Broadcasting Corporation (BBC) showed that sunlight was helpful in treating malignant melanoma. Patients with the most sun exposure were less likely to die than those who avoided the sun.
Numerous other cancer experts have come to the same conclusion: Sun exposure is not to blame for the increase in skin cancer rates and is actually protective of many cancers. However, sunscreen could be part of the problem.
Is Sunscreen the Answer?
In the past 50 years, sunscreen use has increased dramatically. According to the CDC (U.S. Center for Disease Control), at least 61% of American adults protect themselves from the sun, and that this reflects a substantial increase over the years. Back in the early 1970s, sales of sunscreen were around $18 million. By some estimates, this has now grown to almost $400 million annually.
Yet, clearly studies do not inclusively support the efficacy of sunscreen to prevent cancer, including melanoma. If you consider the studies mentioned, the occurrence of melanoma (and other cancers) has actually been found to decrease with greater sun exposure, and increased by sunscreens which block the production of vitamin D. If sunscreen really did prevent skin cancer, we would have seen a rapid decline in rates. Instead, incidences of skin cancer have been rising.
This means that the dramatic endorsement for avoiding the sun and slathering on copious amounts of sunscreen may have made millions of dollars for sunscreen producers, but put millions of people at a greater risk for cancer.
How Sunscreen Causes Cancer
In addition to blocking vitamin D production, sunscreen also directly contributes to cancer. When people wear high-protection sunscreen, they tend to stay in the sun too long. By doing so they expose themselves to excessive radiation, and possibly sunburn or sun poisoning.
It is claimed that too much ultraviolet (UV) radiation from the sun or sunbeds can damage DNA in skin cells. The effects of the sun’s rays advance through the action of the free radicals produced in the skin. If enough DNA damage builds up over time, it can cause cells to start growing out of control, which can lead to skin cancer.
To further explain, sunburn is a painful immune response from UV radiation that creates inflammatory chemicals called cytokines. Through this process, damaged cells are removed and are replaced with healthy cells. While this might sound good, cytokines generate free radicals that can damage DNA, potentially causing mutations that lead to tumor initiation.
Ample evidence supports the involvement of cytokines in events leading to the initiation, promotion, invasion, and metastasis of cancer. Plus, it is not a perfect system. Damaged skin cells that aren’t removed can lead to skin cancer. So there is a clear difference between “getting some sun” and routinely “turning into a lobster.”
The Cancer Risk from Chemical Sunscreens
And don’t overlook the added cancer risk from chemical sunscreens themselves. Chemicals found in many sunscreens are toxic endocrine disruptors and damage the heart and liver.
Sunscreen soaks into the skin and enters the bloodstream. A single application can last for up to two days, and as it is absorbed through the skin it bypasses the liver for detoxification.
Chemical sunscreens function by absorbing UV light. As a result, they form DNA-damaging free radicals. In a study done by the Norwegian Radiation Protection Authority, research showed that the reaction between Octyl methoxycinnamate (OMC) and sunlight was twice as toxic as the chemical on its own. OMC is present in 90% of sunscreen brands!
Prevent Cancer by Eating Your Sun Protection
A reasonable amount of sun exposure along with a healthy lifestyle can significantly decrease your risk of cancer. It is important to know that nutrient-deficient diets, smoking, excessive alcohol consumption, and obesity are believed to account for at least 50% of cancer-related deaths, including from melanoma. Genetics is closely linked to the ability to defend against UV damage and skin cancers. While we cannot change the genes we were born with, we can make lifestyle changes that positively affect gene expression.
If you do tend to spend considerable time in the outdoors

[Dmitri]

I freakin' KNEW it.

BTW you didn't quote the entire article -- here's the source:
https://thetruthaboutcancer.com/sun-exposure-cancer/

[Steve James]

Can't argue about the cancer, but people who've stayed in the sun for long periods often have skin problems. Though, it could also be genetic.

[Serena]

`

[Taste of Death]

gOOD TO KNOW BASED ON THE AMOUNT OF TIME i SPEND TRAINING OUTSIDE.

oops.

If you are going to spend all your time in the pub you won't have to worry about the sun much.

[yeniseri]

I worked in clinical research with sunscreen studies (they were rather boring ) but on eproblem was that too many people actually burn themselves trying to brown' when it goes against their genetic' makeup. The continents are that way (geography) based on climate distribution and people are a certain way based on adaption. Anything beyond that is asking for problems as we have seen.

We have heard the horror stories of individulas trying to tan themselves and either getting locked in the tanning both or forgot to turn something off..........

[Bao]

Can't argue about the cancer, but people who've stayed in the sun for long periods often have skin problems. Though, it could also be genetic.

If you read the whole article, it says that excessive exposure of sun can indeed be one thing that help to cause cancer. But the point is that sun block can't help to prevent it. And also, because of that people believe in Sun block it make them stay in the sun too long.

[Steve James]

My point was that over-exposure does not seem like it's good for some peoples' skins. UV radiation is not good for the skin whether or not one gets skin cancer. However, the results might be genetic, and some people would develop skin problems whether they stayed in the sun or not. This may also have to do with the production of vitamin D and melanin.

I never suggested that people do anything different or that sunscreen helped. http://www.mayoclinic.org/healthy-lifes ... s-20076973

[Michael]

We have heard the horror stories of individulas trying to tan themselves and either getting locked in the tanning both or forgot to turn something off..........

Hostel 6: The Tannening - ten young travelers on their way to Bali stop in a hostel for a quick UV session. It writes itself.

[Dmitri]

yeah "over-anything" is not a good thing... Bottom line to me is that sunlight is a good thing for humans, -- and sure, "too much of a good thing" applies to it like it does to everything else. Except for money maybe.

I also liked the way she put it, the idea that you can "eat your sun protection"

And yes, of course genes play a huge role -- as with everything else.

I was just glad to have confirmed my long-carried suspicion that people in general over-indulge with sun screens, and that the intensely-anti-sunlight propaganda on most seemingly respectable cancer-related resources on the web (like American Cancer Society) has gone WAY too far for way too long.

[Ron Panunto]

I got skin cancer on my nose a few years ago and had to have it surgically cut out. I presume it was from the sun.

[chud]

Good article Ken, I agree completely.
So much time was spent in the past warning about the dangers of the sun most of us are now vitamin D deficient!

My wife and I are both office workers and our doctor has us on prescription Vitamin D.
Several of my co-workers are too.
I have been making it a point to stand out in the sun every day now.
I have to do it before the heat of the day though, it is very hot here (we'll hit 100F/38C this weekend).

[Bao]

Reviving this topic. Lately my wife has been doing research on skin creams, sunscreen and how UV radiation affects different substances. There has also been a PHD work published recently on this. So to make the long story short, like the research in the article says, UV does create radicals that damage the DNA. But there is more to it. There are substances form that can actively cause skin cancer. There are many substances that can do this, some of the most common stuff does it. So now there's scientific proofs that it's probably more likely that sunscreen is the cause of skin cancer, than that it prevents it. Also, not only perfumes cause contact allergy, but also the sunblock itself can do it as well.

Don't use sunscreen, it does more harm than good. And never use any kind of skincream, perfumes or similar in strong sunlight.

[Steve James]

I don't use sunscreen. I didn't read the study, but did it compare skin cancer rates between those who do use sunscreen and those who don't? The simple solution is simply not to use it and see what happens. People are encouraged to use it, but aren't forced to.
Or, is there a differing rate among people with more and less melanin? People with lighter skin can obtain their vitamin d more easily from sunlight.

[Peacedog]

Having lived in many of the world's deserts I think there is some truth to this article.

Sunscreen definitely preserves skin quality from what I've seen. While very effective at preserving skin quality, I haven't seen it make a difference in terms of who got cancer or not. Granted, the work environment and other issues associated with what I was doing may have been major influencers.

As for cancer, the dangerous melanomas appear more often on parts of the body that are normally covered or that previously had hair in those that lost theirs from what I've seen. An dermatologist could provide more clarity on this observation.

That said, all of the other problems arising from Vitamin D deficiency appear much worse in general.

So, I think it is all a balancing act. Too much or too little yields problems.

But hey according to a Boston State Hospital study direct sunlight exposure to your scrotum raises testosterone levels 200% in men.