Secular trends of salted fish consumption and nasopharyngeal carcinoma: A multi-jurisdiction ecological study in 8 regions from 3 continents

Despite salted fish being a classical risk factor of Nasopharyngeal Carcinoma (NPC), whether secular trends in salted fish consumption worldwide accounted for changes in NPC rates were unknown. The relationship between vegetable and cigarette consumption to NPC risk worldwide were also largely uncertain.