Study tries to prove hormone therapy causes breast cancer

ABC7's media partners, The Marin Independent Journal, have posted results from the "Marin Women's Study." It showed a sharp reduction in the use of combined estrogen and progesterone therapy was followed by a significant drop in breast cancer rates. Researchers found use of hormone therapy in Marin County declined from 21 percent in 1998, to just under 7 percent in 2007. Breast cancer rates fell more than 33 percent between 2001 and 2004, but since that time have shot back up again.