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      Health Warning On Widely Used Drug

      There's a word of caution about a drug that's widely used for breast cancer.

      New research says its side effects could be worse than first thought.

      The drug is called Herceptin.

      Researchers found it's effective at treating some breast cancers.

      But it can also cause heart muscle damage in older women.

      The study appears in the Journal of the American College of Cardiology.

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