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New mammogram guideline balances risks: Opposing view
USA Today

Cancer screening is like searching for needles in a haystack. The needles are the women with breast cancer. The hay is the healthy population.

We don’t have a magnet to magically detect the needles. Instead, we sift through each piece of hay: The fewer the needles, the harder they are to find. That’s why we don’t screen women in their 30s. Even though cases of fatal breast cancer exist in this group, they’re very rare. Meanwhile, for women 50 and over, there’s broad consensus about recommended screening.