Do gastric ulcer & stomach cancer look similar or different in endoscopy?

Can look similar. most gastric lesions arise along lesser curvature or cardio esophageal junctions as ulcers derived from helicobacter p. The lesion begins as a non healing lesion and if biopsied can show a portion of the ulcer wall with Ca. If allowed to progress, the ulcerating lesion will become a larger nodular or fungating lesion that presents with performation and or hemorrhage.