From Yahoo News:
Taking menopause hormones for five years doubles the risk for breast cancer, according to a new analysis of a big federal study that reveals the most dramatic evidence yet of the dangers of these still-popular pills.
Even women who took estrogen and progestin pills for as little as a couple of years had a greater chance of getting cancer. And when they stopped taking them, their odds quickly improved, returning to a normal risk level roughly two years after quitting.
Collectively, these new findings are likely to end any doubt that the risks outweigh the benefits for most women.
You can read more about a recent Prempro verdict here. The article discusses a four-week trial in which a jury said Premarin, an estrogen replacement, and Prempro, a combination of estrogen and progestin, were defective products and found Wyeth was negligent in producing, marketing and selling the drugs.