The tablets contain a chemical called acetaminophen which has been linked to cases of cancer in a number of individuals who were taking the drug.
The findings will terrify the millions in America and worldwide who pop the pills to cure minor ailments without so much as a second thought.
Earlier work has shown that aspirin use might lower the odds of dying from colon cancer but increase the risk of bleeding ulcers. The picture has been less clear for blood, or haematologic, cancers, however.
The finding adds another twist to the complicated evidence linking cancer and painkillers, and hints acetaminophen might be different from the rest.
'Prior to this study there was very little evidence that aspirin reduces your risk of haematological cancers,' said Emily White of the Fred Hutchinson Cancer Research Center in Seattle, who worked on the new research.
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