Some Cancers Found By Mammograms Would Have Naturally Regressed, Study Suggests

Breast cancer rates increased significantly in four Norwegian counties after women there began undergoing mammography every two years, according to a new report. Rates among regularly screened women remained higher than rates among women of the same age who were screened only once after six years, suggesting that some of the cancers detected by mammography may have spontaneously regressed had they not been discovered and treated.

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