There has been some limited research evidence about the potential protective effects from advanced prostatic cancer of cruciferous vegetables, particularly from the brassica family such as broccoli, cabbage and kales, although there is not, as yet, an abundance of evidence.
(See: Kirsh V. et al. Prospective Study of Fruit and Vegetable Intake and Risk of Prostate Cancer http://jnci.oxfordjournals.org/cgi/content/abstract/99/15/1200).
These vegetables include:
Broccoli
Cauliflower
Cabbage
Brussels sprouts
Bok choy
Kale