| [the association between helicobacter pylori and gastric neoplasia. epidemiologic evidence]. | helicobacter pylori (hp) causes chronic gastritis and, together with non-steroidal anti-inflammatory drugs, is considered the most frequent etiologic agent of peptic ulcer. since there are numerous epidemiologic and pathogenesis studies that demonstrate an association between infection by hp and gastric neoplasias, the world health organization declared, in 1994, hp infection a group 1 carcinogen (a definitive cause of human neoplasias, similar to tobacco). this article reviews the epidemiologic ... | 2000 | 11464618 |