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An unleashed immune system can attack cancer, organs

Caught in the middle are patients such as Mr Peal, whose stories show the delicacy of tinkering with the immune system.

New York

AS Chuck Peal lay in a Waterbury, Connecticut, emergency room one Sunday in early September, doctors furiously tried to make sense of his symptoms. Mr Peal, 61, appeared to be dying and they were not sure why.

He slipped in and out of consciousness, his blood pressure...

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