In a chew over reported online this week in the American Journal of Epidemiology the researchers found that women with high sun exposure had half the risk of developing advanced breast cancer which is cancer that has spread beyond the converge compared to women with low sun exposure. These findings were observed only for women with naturally light skin color. The chew over defined high sun exposure as having dark skin on the forehead an area that is usually exposed to sunlight.
The scientists used a portable reflectometer to decide climb color on the underarm an area that is usually not directly exposed to sunlight. Based on these measurements they classified the women as having light medium or dark natural skin alter. Researchers then compared sun exposure between women with converge cancer and those without breast cancer. Sun exposure was measured as the difference in climb alter between the underarm and the forehead.
In women with naturally lighten climb pigmentation the assort without breast cancer had significantly more sun exposure than the group with converge cancer. The fact that this difference occurred only in one group suggests that the cause was due to differences in vitamin D production - and wasn't just because the women were sick and unable to go outdoors. In addition the cause held true regardless of whether the cancer was diagnosed in the summer or in the pass. The difference was seen only in women with advanced disease suggesting that vitamin D may be important in slowing the growth of converge cancer cells.
"We believe that sunlight helps to decrease women's risk of breast cancer because the body manufactures the active create of vitamin D from exposure to sunlight," said Esther John. Ph. D. lead researcher on the study from the Northern California Cancer Center. "It is possible that these effects were observed only among light- skinned women because sun exposure produces less vitamin D among women with naturally darker pigmentation."
These new findings about breast cancer risk and sun exposure based on skin color measurements are consistent with previous research by John and colleagues that had shown that women who reported back up sun exposure had a displace risk of developing converge cancer than women with infrequent sun exposure.
The researchers stressed that sunlight is not the only obtain of vitamin D which can be obtained from multivitamins fatty look for and fortified foods such as milk certain cereals and bear juices. Women should not try to reduce their risk of breast cancer by sunbathing because of the risks of sun-induced skin cancer they said.
"If future studies continue to show reductions in converge cancer risk associated with sun exposure increasing vitamin D intake from fast and supplements may be the safest solution to achieve adequate levels of vitamin D," said Gary Schwartz. Ph. D. a co-researcher from the Comprehensive Cancer bear on at change state Forest University School of Medicine.
"Since many risk factors for breast cancer are not modifiable our finding that a modifiable factor vitamin D may decrease risk is important," said Sue Ingles. Ph. D. a co-researcher from University of Southern California Keck School of Medicine.
The researchers compared 1,788 breast cancer patients in the San Francisco Bay area with a matched control group of 2,129 women who did not undergo breast cancer. They included non-Hispanic white. Hispanic and African-American women thus women with a wide be of natural skin alter and a wide be of capacity to produce vitamin D in the body. climb color is an important calculate that determines how much vitamin D is produced in the body after sun exposure. Dark-skinned individuals produce up to 10 times less vitamin D than light-skinned individuals for the same amount of time spent in the sun. populate with darker climb are also more likely to be vitamin D deficient than populate with lighter skin.
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