Actress Rita Wilson arrives at the premiere of the documentary Fed Up in West Hollywood, Calif., in May 2014. Gus Ruelas/Reuters/Landov hide caption

itoggle caption Gus Ruelas/Reuters/Landov
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The U.S. Preventive Services Task Force recommends mammograms every other year, while the American Cancer Society endorses annual scans. Kari Lehr/Image Zoo/Corbis hide caption

itoggle caption Kari Lehr/Image Zoo/Corbis

Catharine Becker of Fullerton, Calif., was diagnosed with stage 3 breast cancer at 43 despite having a clean mammogram. The mother of three didn't know she had dense breast tissue until after she was diagnosed. Heidi de Marco/Kaiser Health News hide caption

itoggle caption Heidi de Marco/Kaiser Health News

Some researchers recommend starting mammogram screening at age 40, while others say age 50. Some doctors think screening should be based on a woman's overall risk for breast cancer, not just her age. Hero Images/Corbis hide caption

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It's a good start when experimental compounds stop the proliferation of cancer cells in the lab. But, as many researchers have learned the hard way, that's just an early step toward creating a worthwhile treatment. Science Source hide caption

itoggle caption Science Source

Mary Harris was relieved when Stella was born with a mop of thick black hair, as if she had been protected from the chemo somehow. Courtesy of Howard Harris hide caption

itoggle caption Courtesy of Howard Harris