Broccoli chemical's cancer check

A chemical in vegetables such as broccoli, cauliflower and cabbage can boost DNA repair in cells and may stop them becoming cancerous, a study says.

Another chemical in soy also performs the same role, the Georgetown University team said.

Although a link has already been found between eating these foods and a reduced cancer risk, this research shows how that might happen.

The research is published in the British Journal of Cancer.