<prompt> H. pylori have been implicated in all, exceptGastric ulcerGastric lymphomaGastric leiomyomaGastric carcinoma  <response>: H. pylori infection is almost always present in the setting of active chronic gastritis and is present in most patients with duodenal 80 to 95 and gastric 60 to 90 ulcers.H. pylori infection was associated with a twofold increased risk of developing gastric cancer. There is also a strong association between mucosa-associated lymphoid tissue MALT lymphoma and H. pylori infection.Sabiston 20th edition pg: 1198 