Scientists know that being overweight increases the risk of breast cancers fed by estrogen, but being too fat may also increase the risk of triple-negative breast cancers, a less common and far more deadly type, U.S. researchers said on Tuesday.

They said women who are overweight had a 35 percent higher risk of developing triple-negative breast cancers, an aggressive form of cancer that affects 10 to 20 percent of cases.

http://www.reuters.com/article/2011/03/01/cancer-breast-idUSN01169284201...