Liquid nitrogen latest in cancer war

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Doctors have tried cooking it with chemicals, radiation and heat. Now they?re freezing it.

At the University of Maryland Medical Center, doctors are using a new cryotherapy technique to treat cancerous and precancerous conditions of the esophagus by freezing the tissue in place. The center is one of a handful of facilities in the world offering the CryoSpray ablation procedure and one of three conducting clinical research to determine its effectiveness.

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