The presence of isothiocyanates in broccoli has also been identified as the most probable reason for its cancer fighting properties by a review published in the Asian Pacific Journal of Cancer Prevention in 2013. (fitnessandpower.com)
Cauliflower and cabbage are in the cruciferous vegetable family which is known for it's high levels of vitamin C and compounds called isothiocyanates, which prevent cancer cells from growing. (ashleyneese.com)
The conversion of glucosinolates into isothiocyanates in kale is shown to possess chemoprotective properties. (cancertutor.com)