email article Active surveillance for men diagnosed with low-risk prostate cancer has recently become more popular, but remained underused with great variability across various regions in the U.S., data through 2015 indicated. About one-third (32.5%) of men with localized, low-risk prostate cancer were followed with active surveillance in 2015, up from only 13.1% in 2010, reported Matthew R. Cooperberg, MD, MPH, of the University of California San Francisco, and colleagues in In the entire cohort of 79,825 men included in the SEER Prostate with Watchful Waiting database, a "below optimal" 22.1% had undergone active surveillance. By linking these data with the County Area Health Resource File, Cooperberg and colleagues also found great variation in the use of active surveillance strategies by U.S. region.