Nixon, who starred in the former hit TV show "Sex and the City," will speak out about her experience with breast cancer, attend events and help educate millions of people about the disease through TV and radio public service announcements, the group said.
"As the daughter of a breast cancer survivor, knowing my personal risk made me more aware and more empowered when I faced my own diagnosis," Nixon said in a statement. "I want to help Susan G. Komen for the Cure educate the 1.1 million women around the globe who face a diagnosis each year. Even if breast cancer doesn't run in your family -- take charge. Talk with your doctor, make healthy lifestyle choices and most importantly, know your body as that can make all the difference in the world."
Nixon discussed her 2006 cancer battle on "Good Morning America" Tuesday.
"I didn't want to make it public while I was going through it," she said. "I didn't want paparazzi at the hospital and things like that."