Study: BPA, methylparaben block breast cancer drugs.

San Francisco Chronicle

Victoria Colliver

September 13, 2011

San Francisco researchers have discovered that two chemicals commonly used in consumer products – bisphenol A and methylparaben – can interfere with the effectiveness of drugs used to fight breast cancer.

The research by doctors from California Pacific Medical Center in San Francisco is part of a growing body of evidence looking at the negative health effects of BPA, a plastic hardening chemical found in food containers, cans and even sales receipts, as well as methylparaben, a lesser-known preservative found in cosmetics and personal care products.