Bisphenol A (BPA), an artificial estrogenic compound widely used in plastics for food containers, may increase the adult breast cancer risk of female fetuses. This confirms earlier findings regarding a link between BPA and breast cancer.
A study exposed pregnant rats to bisphenol A at a range of doses from 2.5 to 1,000 micrograms per kg of body weight per day.
Their female children developed precancerous breast lesions during puberty at a rate three to four times higher than usual. BPA resulted in an increased level of lesions at all dose levels, which suggests that the current exposure limit set by the U.S. EPA (50 micrograms per kg per day) has put American women at risk of breast cancer.
BPA is used in the manufacture of polycarbonate plastics for many food and beverage containers, including baby bottles and canned food linings. Dental composites can also contain the chemical. Urine analysis has shown that 95 percent of people have been exposed to BPA. BPA has also been linked to prostate cancer and brain tissue damage, even at extremely low levels.