Mammograms are a key screening tool for breast cancer. But critics say they're not good enough. Salih Dastan/iStockphoto hide caption toggle caption Salih Dastan/iStockphoto Shots - Health News Latest Evidence Against Mammograms Adds To Women's Uncertainty February 12, 2014 A Canadian study finds no reduction in deaths over the long haul for women who got mammograms to detect breast cancer beginning in the 1980s. It's the latest study to raise questions about the value of regular mammograms. But radiologists faulted the study as flawed and rejected its conclusions.