" treatments aimed not just at reducing tumor bulk but at targeting what has been called the “beating heart of the tumor”:112 cancer stem cells. That’s where broccoli may come in. Sulforaphane, a dietary component of cruciferous vegetables like broccoli, has been shown to suppress the ability of breast cancer stem cells to form tumors.113 This means that if you’re currently in remission, eating lots of broccoli could theoretically help keep your cancer from returning. "

― Michael Greger , How Not to Die: Discover the Foods Scientifically Proven to Prevent and Reverse Disease