S100A8 and gastric cancer: In univariate analyses, age (β = 1.04, p < 2.00 × 10–16), sex (OR = 2.51, p = 2.53 × 10–16), wood stove use (OR = 2.57, p = 5.52 × 10–8), and bacterial CagA serostatus (OR = 3.51, p = 4.20 × 10–13) all associated with an increased risk of gastric cancer (Table 2).