In Science Times today, Denise Grady explores the usefulness of breast cancer screening.

Ms. Grady writes:

Mammograms are no fun, to put it mildly. Like many women, I have been putting up with them in hopes that, if I get cancer, they might find it early enough to save my life and maybe help me avoid extensive surgery and chemotherapy. Have I been kidding myself?

Hoping to make sense of it all, I consulted several experts. All said mammograms were still important — after all, breast cancer kills 40,000 women a year in this country — but they differed about who really needed them and how often.

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