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Moles, beauty marks and birthmarks are, for most people, just another thing on their skin. And with the exception of these few health conscious teenagers, many of us do not learn about the real moles that pose to us when it comes to skin cancer . But now, two new studies suggest that the number of moles on a person's body can also determine their risk of developing bad cancer.
Moles are relatively common, grow on the skin of most children and become lighter. . According to the American Academy of Dermatology, almost all adults have some moles, 10 to 40 at various places in the body being quite common and normal. People who have more than 50 are more likely to develop melanoma, the most dangerous form of skin cancer.
One of two studies, conducted by American scientists, found that women over 15 moles of névés, on their arm are 35 percent more at risk of developing bad cancer. The other study, conducted by French scientists, showed that women who reported having "very" many moles at the beginning of the study were 13% more likely to develop bad cancer – an "badociation". modest between the number of naevi and the overall risk of bad cancer. " they wrote, according to NBC.
US researchers speculated that the risk could come from excess estrogen, which has been linked to both the growth and spread of bad cancer tumors, and the growth of naevi. "They could be a marker of lifetime exposure to estrogen," said Barbara Fuhrman, badistant professor at the University of Arkansas for Medical Sciences, according to Health Day ].
However, this link can only apply to the general population and not to an individual patient. Dr. Deanna Attai, a California bad surgeon, told NBC that risk factors like obesity and family history are even more crucial to a person's overall risk.
The US study used data from the Nurses' Study Health Study, which involved more than 74,500 women over a 24-year period. The researchers found that 8.48% of women had not developed bad cancer, while 11.4% of women aged 15 or older had developed it. A subgroup of women found that postmenopausal women with six or more naevi had higher levels of estrogen and testosterone, and those without naevi. After eliminating estrogen levels, the badociation between nevi and bad cancer has "disappeared," according to a press release
The French study conducted by researchers of the 39. INSERM, a biomedical research and public health institution, has focused on E3Ns. & # 39; Study Cohort. It involved nearly 90,000 women and followed them for 18 years. Although the presence of "very many" moles was badociated with bad cancer risk, the researchers found that the badociation was not significant after adjustment for known risk factors for bad cancer, such as benign bad disease and family history.
Studies have pointed out these limitations and have called for new research. With an estimated 232,670 new cases and 40,000 deaths this year, bad cancer is the most common type of cancer among women. Until these results can be confirmed, the researchers said that the number of nevi on a woman's body can not be used as a marker, or index, at the risk of a woman – how it could improve the risk estimate is another issue, however.
Source: Zhang M, Zhang X, A Qureshi, H Elibaden, Hankinson S, Han J. Association between the Nevi dermal and bad cancer in the study on the health of nurses: a prospective cohort study . PLoS Medicine . 2014.
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