S100A8 and gastritis: No significant difference was observed between the group of gastritis patients and blood donors regarding to the STAT3 genotype distribution (p = 0.75; OR = 1.05; 95 % CI = 0.76-1.45) and CagA status (p = 0.22; OR = 1.19; 95 % CI = 0.76-1.45).