http://74.125.95.104/search?q=cache:ovEY6GRS9ukJ:www.theglobeandmail.com/servlet/story/RTGAM.20080418.wlcancer18/BNStory/specialScienceandHealth/home+%22bisphenol+a%22+breast&hl=en&ct=clnk&cd=9&gl=us&client=firefox-aBisphenol A can alter genes, study finds
Bisphenol A, the widely used compound in polycarbonate plastic, has the ability to alter the activity of genes in normal breast cells in ways that resemble what is found in extremely dangerous breast cancers, according to a new study.
The study, conducted by researchers in California and published this month in the journal Cancer Research, found that many genes in non-cancerous breast cells exposed to trace amounts of bisphenol A began acting in a way that closely resembled the gene activity in highly aggressive breast tumours that led to an increased likelihood that women would die of the disease.
snip
Animal experiments have found that fetal or early life exposures to BPA cause lesions that may lead to increased susceptibility to mammary gland tumours later in life, but the scientific evidence hasn't been deemed strong enough to conclude that the chemical is also a human carcinogen. Other researchers have exposed already cancerous breast cells to BPA and found the chemical causes them to proliferate.
snip
The researchers then compared the response they found in normal tissue with publicly available gene expression profiles from about 525 breast tumours taken from cancer patients in the United States, Britain, Norway, the Netherlands and Sweden. They noted that the tissue they had exposed to BPA had a "striking association with tumour aggressiveness," according to the study.
----------
Two words: Bad plastic
Scientists now fear a chemical used in baby bottles and CDs, food cans and dental sealants, can disrupt fetal development and even lead to obesity.
http://www.salon.com/news/feature/2007/08/02/bisphenol/print.htmlIn January of this year, Hunt and colleagues published a study showing that exposure to small levels of bisphenol A disrupts normal egg cell growth in a developing female mouse embryo, setting the stage for potential miscarriage. Bisphenol A, explains Hunt, affects three generations: mother, developing female baby, and the daughter's potential children. Meanwhile, Taylor and his colleges have seen lifelong changes caused by prenatal exposure to bisphenol A.
In a recently published paper, they show that exposure to bisphenol A during pregnancy can cause "lasting changes in development of the uterus that could pose problems in pregnancy," including potential miscarriage. Hunt and Taylor both explain that many factors contribute to miscarriage and fertility problems. But, says Hunt of bisphenol A, "We know enough to know that we should be concerned." Exposure to bisphenol A is "an important and modifiable environmental risk that we should at least inform people about," says Taylor, who is also an attending physician in the Department of Obstetrics and Gynecology at Yale-New Haven Hospital.
Scientists have also recently discovered that prenatal exposure to bisphenol A can lead to a predisposition to obesity. Bisphenol A, explains vom Saal, interacts with the nuclear hormone receptors that prompt fat cell development. Bisphenol A apparently accelerates this process, known scientifically as adipogenesis, causing exposed animals to develop more fat cells -- as well as fat cells that store more fat -- leading to a lifetime tendency to obesity. It also affects the feedback loops to which hormones respond, prompting exposed fat cells to send more signals, asking, essentially, to be fed, causing excess fat accumulation.
snip
To date, a direct link between bisphenol A and human reproductive problems and obesity has yet to be proven. It's hard to make that connection, says Taylor, because "people don't know they have had an exposure and it may not manifest itself for 20 to 30 years." But, says Hunt, "If we wait for comparable human data and it comes out like animal data, we aren't going to be breeding as a species."
-------------------
Bisphenol A May Trigger Human Breast Cancer
Study in rats provides strongest case yet against common environmental chemical
http://pubs.acs.org/cen/news/84/i50/8450bisphenol.htmlSoto and her colleagues exposed pregnant rats to bisphenol A at doses ranging from 2.5 to 1,000 µg per kg of body weight per day. By the time the pups exposed at the lowest dose reached the equivalent of puberty (50 days old), about 25% of their mammary ducts had precancerous lesions, a proportion three to four times higher than among the nonexposed controls. Mammary ducts from all other exposure groups showed elevated levels of lesions. Cancerous lesions were found in the mammary glands of one-third of the rats exposed to 250 µg/kg/day.
Bisphenol A, a known estrogenic compound, is ubiquitous in the environment. Many people receive exposures of about 2.5 µg/kg/day, and mammary gland development in rats and humans is very similar. Therefore, Soto says, "bisphenol A could be one factor causing the increase in breast cancer incidence over the past 50 years."
snip
"What is important to note is that Soto's research is not a one-shot finding," says Frederick vom Saal, professor of biology at the University of Missouri. "It follows five years of research demonstrating precancerous changes in the mammary glands of mice with prenatal bisphenol A exposure. Now, Soto has switched to the rat, which is considered a much better animal model for studying human carcinogenesis."
The Environmental Protection Agency has set a safe human intake dose of 50 µg/kg/day for bisphenol A. "On the basis of the effects observed in recent studies, this seems to be an unsafe level," Soto says.
--------
Bottle Maker to Stop Using Plastic Linked to Health Concerns
http://www.nytimes.com/2008/04/18/business/18plastic.htmlThe National Toxicology Program in the United States released a draft report on Tuesday reporting that some rats that were fed or injected with low doses of the chemical developed precancerous tumors and urinary tract problems and reached puberty early. While the report said the animal tests provided “limited evidence,” it also noted that the “possibility that bisphenol-a may alter human development cannot be dismissed.”
----------
A good government would follow the precautionary principle and require substances to be proven safe before letting the loose. Just because everyone doesn't instantly drop dead does not mean it is safe especially for pregnant women and children. I don't want to play human guinea pig so some chemical corp can make a few more $ before this crap is banned.