A meta-analysis by Liu et al, published in the journal The Breast, indicated that high intake of cruciferous vegetable was significantly associated with reduced breast cancer risk.
From the study: “The protective effect of cruciferous vegetables on breast cancer is biologically plausible. Glucosinolates, the precursors of isothiocyanates (ITCs) and indole-3-carbinol believed to have anticancer properties, are especially rich in cruciferous vegetables.31 “