The trial, comprising 3,000 participants, has just got under way. "They were recruited for a three-year trial, but
since it's staggered, the last ones won't be finished until six years after the trial starts," Seufferlein said.
Selected from 30 large medical practices and clinics throughout Germany, the participants have all had colon
polyps removed and are seen as having a heightened risk of colon cancer. Researchers also want to learn
whether green tea can help prevent a recurrence of the polyps.