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LOS ANGELES — Zapping away abnormal, precancerous cells in the throat may lower the risk of later developing esophageal cancer, the first major study to test this technique finds.

In a study of 127 people suffering from a heartburn-related problem known as Barrett’s esophagus, only about 1 percent who had a procedure that uses heat to burn off precancerous spots went on to develop cancer over the next year.