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cancer bacteria
Cancer bacteria are bacteria infectious organisms that are known or suspected to cause cancer. While cancer-associated bacteria have long been considered to be opportunistic (i.e., infecting healthy tissues after cancer has already established itself), there is some evidence that bacteria may be directly carcinogenic. The strongest evidence to date involves the bacterium ''H. pylori'' and its role in gastric cancer.
Oncoviruses are viral agents that are similarly suspected of causing cancer.
==Known to cause cancer==
''Helicobacter pylori'' colonizes the human stomach and duodenum. In some cases it can cause stomach cancer and MALT lymphoma. Animal models have demonstrated Koch's third and fourth postulates for the role of ''Helicobacter pylori'' in the causation of stomach cancer. The mechanism by which ''H. pylori'' causes cancer may involve chronic inflammation, or the direct action of some of its virulence factors, for example, CagA has been implicated in carcinogenesis.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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