简介：LongbeforethediscoveryofHelicobacterpylori,thereweremanyexcellentobservationalstudiesthatdocumenteddifferencesinthepatternsofgastroduodenaldisease.Itwasclearthatinthedevelopingworld,gastriculcerandgastriccancerweremorecommonthaninthedevelopedworldwhereduodenalulcerpredominated.Thiscorrelatedwiththedistributionofgastritisinduodenalulcerpatientswheretheinflammationwasantralpredominantwhileingastriculcerpatientsthegastritiswasmoreevenlydistributedthroughthestomach.Gastriculcersusuallyappearedinafairlyrestricteddistributioninthestomachneartheangulusandclosetothetransitionalzonebetweenantrumandbodymucosa.Asasocietydevelopedsothesepatternsofdiseasechanged.