Medicine: In a Guinea Pig's Eye

Why does a cancer behave differently from normal tissue? At Yale University's Medical School, a lanky, greying pathologist named Harry Sylvestre Nutting Greene is looking for an answer to this basic question.

Dr. Greene's "laboratory" is a guinea pig's eye. Delicately, he plants various types of foreign tissue in the pigs' eyes. Some "take" and grow. Sometimes the transplanted tissue becomes cancerous. Sometimes it develops the characteristics of functioning organs. Cancer specialists, who used to be skeptical, have begun to take a lively interest in Dr. Greene's work. Last week the doctor talked about it before a distinguished audience at the American...

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