THURSDAY, May 17 (HealthDay News) — A preliminary study links
chemicals found in certain sunscreens to a higher risk of endometriosis,
but it’s too soon to say whether there’s any reason for women to change
their habits.
“This is way too early for prime time,” said Warren Foster, a professor
in the department of obstetrics and gynecology at McMaster University, in
Hamilton, Ontario, who studies how chemicals affect people.
In endometriosis, tissue that lines the uterus grows outside the womb,
leading to pain and infertility in some cases. Foster said the causes of
this common condition are fuzzy, and “nothing is proven as far as
chemicals are concerned.”
Even if the chemicals do boost the risk of endometriosis, the findings
don’t specify how many more women might get the disease. Dermatologists
consider sunscreen crucial in the prevention of skin cancer.
Still, the study authors write that their findings should inspire more
research into a possible link. Research is especially important because
the chemicals in question are found in other products such as moisturizers
and lotions, said study co-author Kurunthachalam Kannan, a research
scientist with the New York State Department of Health.
“This is something everybody should be concerned about,” Kannan said.
“We are going to do more studies and look at many of the cosmetics and
personal-care products containing these compounds to see what level people
are exposed to every day.”
The chemicals, known as benzophenone-type UV filters, protect the skin
from the ultraviolet rays of the sun and also mimic the effects of the
female hormone estrogen. Previous research has shown that benzophenone-3,
or BP-3, is absorbed into the bloodstream faster than other sunscreen
agents, the authors noted.
In the new study, researchers examined urine from 625 women from
California and Utah. Those diagnosed with endometriosis were more likely
to have the highest levels of the chemical filters in their urine.
The study doesn’t confirm that the chemicals have anything to do with
endometriosis, and its design didn’t allow the researchers to determine
how much exposure might boost a women’s overall risk of developing
endometriosis.
“There is a concern, definitely,” Kannan said. “But at what level of
usage we should be worried? We don’t know.”
It’s also not clear if the chemicals could have any negative effects on
men.
If the chemicals do have a link to endometriosis, it may relate to
their ability to alter estrogen, Kannan said.
Foster, the professor who studies chemical exposure, said endometriosis
occurs when there’s too much growth in the cells that line the uterus.
Many women have no symptoms, but others develop severe pelvic pain and
other problems.
The condition may affect 7 percent to 15 percent of women of
reproductive age, Foster said. The cause is unclear, although it may have
something to do with genes. He said researchers have explored whether
chemicals may play a role in endometriosis by causing it or making it get
worse, but “nothing that convincing has really come out.”
If you’re concerned about the chemicals, look for sunscreens and other
products that don’t include BP-3.
The study appeared online recently in the journal Environmental
Science Technology.
More information
For more about sunscreen, visit the U.S. National Library of
Medicine.
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