Microbiota in Gastric Cancer by Gastric Mucosal Brushing

Gastric mucosal brushing will be performed at body of stomach in control group and non-tumorous area of body in gastric cancer group. If gastric body area could not feasible (eg. tumor involvement), then gastric antrum and more proximal part of body will be sampling.

Gastric mucosal biopsy will be performed at the area within 2 cm. from brushing site.