From the story here:
Research last year showed tomatoes can slow the growth of stomach cancer, and the World Health Organization recommended in May that other countries follow a diet high in olive oil, fruits and vegetables. ... This is not the first time pizza has been said to help prevent cancer. Research in 2003 discovered people who eat pizza at least twice a week are 59 per cent less likely to develop cancer of the oesophagus, have a 34 per cent lower risk of throat cancer and are 26 per cent less likely to get bowel cancer. Dr Silvano Gallus, of the Mario Negri Institute for Pharmaceutical Research in Milan, said at the time: 'We knew that the tomatoes used in the sauce are considered to be a food that prevents certain tumours. 'However, we did not expect that pizza as a whole offered such high prevention against cancer.'
