Stomach cancer is a major cause of cancer deaths, especially in developing countries; it claims roughly 600,000 lives worldwide every year. About 15 years ago, researchers linked stomach cancer to infection with the ulcer-causing bacterium Helicobacter pylori. Now, a surprising twist in the Helicobacter story raises questions about the origin of the cells that give rise to gastric tumors.
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Jean L. Marx (2004) studied this question.
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