The American Cancer Society (ACS) commends today’s updated recommendations for breast cancer screening from the United States Preventive Services Task Force (USPSTF) for lowering the age to begin mammography screening to age 40, which is more consistent with ACS guidelines. Breast cancer is the second most common cancer and the second most common cause of cancer death for women in the United States. Mammography continues to be the best screening tool to detect breast cancer and save lives.