Is soy milk safe for breast cancer patients?

Unknown: It is unknown for estrogen receptor positive (er+) breast cancers. Soy has estrogen-like properties. In lab studies, some soy products have caused breast cancer cells to die, while other products have caused the same cells to grow. I tell my patients not to take soy supplements in the form of extracts, pills, or powders, but if they enjoy drinking soy milk they may do so, in moderation.

Yes: Similar calories, good for lactose intolerance, and people with lactose intolorence.

Probably: The evidence is unclear, but is most likely safe.