Detecting cancer early is half the battle, and for a generation medical researchers have sought a simple blood test to distinguish definitely between people who are free of cancer and those who have it, or at least may have it. So far their hopes have been raised only to be rudely dashed.* But this week members of the American Association for Cancer Research meeting in Atlantic City listened intently as Dr. Andrew H. Dowdy described the most promising blood test to date.
The new test got its start ten years ago when Dr. Harry S. Penn of the University of California at...
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