S100A8 and colorectal carcinoma: pylori IgG seropositivity was not causally associated with CRC [odds ratio (OR): 1.12; 95% confidence interval (CI): 0.98–1.27, P = 0.08] and neither were H. pylori VacA antibody levels (OR = 0.96, 95% CI: 0.90–1.02, P = 0.25) or H. pylori CagA antibody levels (OR = 1.00, 95% CI: 0.93–1.07, P = 0.92).