| [helicobacter pylori and gastric cancer]. | several unresolved issues still cast doubts on the epidemiological data which point to an association between infection from helicobacter pylori (hp) and gastric cancer. these are: a) the male/female ratio of gastric cancer ranges from 4 to 1.5 in all studies, whereas the prevalence of hp infection is the same in both sexes; b) the prevalence of hp infection is as high as 90% in several developing countries where the frequency of gastric cancer is very low; c) the acquisition of the infection at ... | 1999 | 10528435 |