"The researchers found that, as expected, the introduction of mammogram screening led to an increase in the number of breast cancers detected at an early stage.
But importantly, the number of cancers diagnosed at the advanced stagewas essentially unchanged. If mammograms were really finding deadly cancers sooner (as suggested by the rise in early detection), then cases of advanced cancer should have been reduced in kind. But that didn’t happen. In other words, the researchers concluded, mammograms didn’t work."
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