early stage gastric cancer tumor on the stomach wall angle view 3d

abdominal acid advanced alcohol biopsy bloating cancer cell cells chemotherapy chronic designer detection diet dividing early endoscopy erosion esophagus gastric gastritis gastrointestinal gastroscopic helicobacter illustration immune immunotherapy infection inflammation metastatic mucosa occurrence oncologist oncology operation pain painful pepsin peptic perforation peritonitis pilori pylori radiotherapy smoking spread stomach stress surgery system tract treatment ulcer ulcera