This article discussed a study that shows that tumeric (also known as curcumin) can help prevent prostate cancer. I have read previously about the benefits of tumeric, which is found in most curries (curry is not a spice, but rather a blend of different spices). They also tested phenethyl isothiocyanate (PEITC), commonly found in vegetables such as broccoli and cauliflower:
"The bottom line is that PEITC and curcumin, alone or in combination, demonstrate significant cancer-preventive qualities in laboratory mice, and the combination of PEITC and curcumin could be effective in treating established prostate cancers," said Ah-Ng Tony Kong, a professor of pharmaceutics at Rutgers, The State University of New Jersey.