This study is being done to see if losing weight may help prevent breast cancer from coming back (recurring). Previous studies have found that women who are overweight or obese when their breast cancer is found (diagnosed) have a greater risk of their breast cancer recurring, as compared to women who were thinner when their cancer was diagnosed. At this time we do not know whether or not losing weight will reduce the risk of breast cancer returning. This study seeks to determine whether or not the higher risk for breast cancer recurrence in women who are overweight or obese when they are diagnosed with breast cancer could be reduced or eliminated if weight is lost.
There will be about 3,000 women taking part in this study.
This study has two study groups.