title: ABO blood group, Helicobacter pylori seropositivity, and risk of pancreatic cancer: a case-control study.
abstract: Carriage of a non-O ABO blood group and colonization by Helicobacter pylori are thought to be risk factors for pancreatic cancer. We examined these associations in a population-based case-control study of 373 case patients and 690 control subjects frequency matched on sex and age. Control subjects were selected by random-digit dialing. Seropositivity for H pylori and its virulence protein CagA was determined by enzyme-linked immunosorbent assay (ELISA). Increased risk of pancreatic cancer was associated with non-O blood group (adjusted odds ratio [OR] = 1.37, 95% confidence interval [CI] = 1.02 to 1.83, P = .034) and CagA-negative H pylori seropositivity (OR = 1.68, 95% CI = 1.07 to 2.66, P = .025), but no association was observed for CagA seropositivity (OR = 0.77, 95% CI = 0.52 to 1.16). An association between pancreatic cancer risk and CagA-negative H pylori seropositivity was found among individuals with non-O blood type but not among those with O blood type (OR = 2.78, 95% CI = 1.49 to 5.20, P = .0014; OR = 1.28, 95% CI = 0.62 to 2.64, P = .51, respectively). This study demonstrates an association between pancreatic cancer and H pylori colonization, particularly for individuals with non-O blood types.
authors.affiliation: Department of Epidemiology and Public Health, Yale University School of Medicine, 60 College St, PO Box 208034, New Haven, CT 06520-8034, USA. harvey.risch@yale.edu
authors.forename: Harvey A
authors.initials: HA
authors.lastname: Risch
authors.forename: Herbert
authors.initials: H
authors.lastname: Yu
authors.forename: Lingeng
authors.initials: L
authors.lastname: Lu
authors.forename: Mark S
authors.initials: MS
authors.lastname: Kidd
mesh_terms: D000017:ABO Blood-Group System / Q000009:adverse effects*; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D000907:Antibodies, Bacterial / Q000097:blood*; D000942:Antigens, Bacterial / Q000097:blood*; D001426:Bacterial Proteins / Q000097:blood*; D016022:Case-Control Studies; D015986:Confounding Factors, Epidemiologic; D003237:Connecticut / Q000453:epidemiology; D004797:Enzyme-Linked Immunosorbent Assay; D005260:Female; D016481:Helicobacter Infections / Q000150:complications* / Q000175:diagnosis; D016480:Helicobacter pylori / Q000276:immunology / Q000302:isolation & purification*; D006801:Humans; D015994:Incidence; D008297:Male; D008875:Middle Aged; D016017:Odds Ratio; D010190:Pancreatic Neoplasms / Q000453:epidemiology* / Q000209:etiology* / Q000382:microbiology
chemical_list: D000017:ABO Blood-Group System; D000907:Antibodies, Bacterial; D000942:Antigens, Bacterial; D001426:Bacterial Proteins; C080866:cagA protein, Helicobacter pylori