Broccoli and other cruciferous vegetables have long been known to have anti-cancer benefits, and researchers have now found out why. One well-known anti-cancer chemical in broccoli, indole-3-carbinol, was found to inhibit the enzyme elastase, which is found at high levels in late-stage breast and prostate cancers. The discovery of this target will help to design better anti-cancer drugs and to target treatment to specific types of cancer, including late-stage breast and prostate cancers.