Recognize the relation between Helicobacter pylori and neoplasms of the stomach, and select the most diagnostic test.

Explanation:

H. pylori has been implicated strongly as the antigen which initiates gastric MALT(mucosa associated lymphoid tissue) lymphomas (B-cell lineage).

Nested case control studies have implicated it as a factor in the development of Type I gastric adenocarcinoma.

It is thus important to eradicate this. Also see gastro44.htm