HSPD1 and biliary tract cancer: Two additional H. pylori antigens were associated with subsequent incidence of biliary tract cancer (Supplementary Table 2): GroEL (OR: 2.10, 95% CI: 1.00, 4.40) and HP0305 (OR: 2.21, 95% CI: 1.04, 4.69), but not liver cancer.