PRKAA1 and gastric cancer: The additive interaction between the PRKAA1 rs10074991 genotype and HP infection in relation to gastric cancer risk was statistically significant (RERI, 0.53; 95% CI: 0.03–1.03; P = 0.037), while the multiplicative interaction was not statistically significant (OR, 1.36; 95% CI: 0.79–2.34; P = 0.261).