Could cancer be an infectious disease? In some cases the answer is at least partly yes. Viruses are thought to play a role in liver and uterine cancer and some forms of lymphoma. Now comes the news that bacteria may actually be a major culprit in the world's second most common malignancy: stomach cancer, which afflicts an estimated 700,000 a year worldwide.
In separate studies of 130,000 and 6,000 people, reported in the New England Journal of Medicine, researchers from Stanford and Kuakini Medical Center in Honolulu found that people infected with the bacterium Helicobacter pylori were three to six times...
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