A 62-year-old woman presents with 3 months of epigastric pain and dyspepsia. Upper endoscopy reveals erythematous nodular mucosa in the antrum (marked **A** in the diagram) with loss of normal vascular pattern. Multiple biopsies show small centrocyte-like lymphocytes with lymphoepithelial lesions; immunohistochemistry is CD20+, CD5−, CD10−, CD23−. H. pylori is detected on urease testing. The patient is staged as Lugano stage I. Which of the following is the most appropriate first-line management for this gastric MALT lymphoma?
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