This interesting study looked at cruciferous vegetables (specifically cabbage and Brussell sprouts) to see if they had any estrogenic activity. Basically they found that low doses of cruciferous vegetables can help block estrogen induced tumor activity, however, high doses actually induced tumor growth … so once again research agrees with the age old wisdom of Chinese Medicine.
J Agric Food Chem. 2000 Oct;48(10):4628-34