Is soy OK for breast cancer patients?

Eating soy-based foods does not appear to be harmful and may even benefit some women with breast cancer, new research shows.
The study may help clear up confusion over whether soy products such as tofu, soy milk, edamame, tempeh and miso – foods rich in estrogen-like chemicals – are OK to consume if you have breast cancer.
Higher estrogen levels have been linked to the growth and spread of breast cancer in the most common form of the disease.
Dr. Fang Fang Zhang, a cancer epidemiolog