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Helicobacter pylori colonizes the stomach for decades in most people, and induces chronic gastritis, a long-lasting inflammation of the stomach. In most cases symptoms are never experienced but about 10–20% of those infected will ultimately develop gastric and duodenal ulcers, and have a possible 1–2% lifetime risk of gastric cancer.
Colorectal cancer [3] Helicobacter bilis: Biliary cancers (such as gallbladder and biliary tract cancers). [2] Helicobacter bizzozeronii: Gastric MALT lymphoma. [2] Helicobacter felis: Gastric MALT lymphoma. [2] Helicobacter heilmannii: Marginal zone B-cell lymphoma of the stomach. [2] [4] Helicobacter hepaticus: Biliary cancer. [2 ...
Helicobacter pylori colonizes the human stomach and duodenum. It is described as a Class 1 carcinogen. [2] In some cases it can cause stomach cancer [3] [4] and MALT lymphoma. [5] Animal models have demonstrated Koch's third and fourth postulates for the role of Helicobacter pylori in the causation of stomach cancer. [6]
Helicobacter heilmannii s.s. (H. heilmannii s.s.) is a species within the Helicobacter genus of Gram negative bacteria. [1] Helicobacter pylori (H. pylori) is by far the best known Helicobacter species primarily because humans infected with it may develop gastrointestinal tract diseases such as stomach inflammation, stomach ulcers, duodenal ulcers, stomach cancers of the non-lymphoma type, and ...
Bacterial infection may also increase the risk of cancer, as seen in Helicobacter pylori-induced stomach cancer. [4] Parasitic infections strongly associated with cancer include Schistosoma haematobium (squamous cell carcinoma of the bladder) and the liver flukes, Opisthorchis viverrini and Clonorchis sinensis (cholangiocarcinoma). [5]
Gastritis caused by H. pylori infection is termed Helicobacter pylori induced gastritis, and listed as a disease in ICD11. [6] [7] More than 80% of individuals infected with the bacterium are asymptomatic and it has been postulated that it may play an important role in the natural stomach ecology. [17]
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