Precancerous Breast Lesions Cause Unnecessary Worry

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"There is this ironic finding that women with this early precursor lesion may be treated more aggressively than women with invasive breast cancer," he said. "They may have mastectomies instead of just a lumpectomy. At some level we have to say, 'Does this really make sense?'"

Another study in the same issue of JNCI suggests that medical science is winning the war on breast cancer. The research, which involved nearly 5,000 breast cancer patients, was led by the National Cancer Institute of Canada's Clinical Trials Group. A total of 256 of the participants died during the four-year study.

The researchers found that older women who had survived for at least five years after a diagnosis of early stage breast cancer were most likely to die of causes unrelated to their breast malignancy. In fact, 60 percent of these deaths were not caused by breast cancer, the Canadian team found.

More information

For more on DCIS, head to the U.S. National Cancer Institute.