A new study appears to confirm the worst doubts about the value of mammograms, suggesting that more than half of cancer diagnoses that come from the widely-used screenings are mistakes.

The study, which was published in the New England Journal of Medicine on Wednesday, concluded that while the advent of mammograms had led to a sharp increase in the number of small tumors detected among women, the majority of the newly-discovered tumors were benign.

Unfortunately, many women have been subjected to aggressive interventions in response to tumors that would likely not develop into life-threatening cancers, the study found.

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