Wasif N, et al. - Researchers investigated how improvements in postoperative mortality overall during the last decade have influenced the volume-outcome association. From the National Cancer Database, patients undergoing colon, esophageal, liver, and pancreatic surgery from 2003 to 2011 were identified. Hospitals were divided into low-volume (< 33rd %tile), medium-volume (34–66th %tile), and high-volume (> 67th %tile) groups. Observations revealed that for major cancer surgery, the volume-outcome association is dynamic and has weakened over time. Improvements in postoperative mortality at low- and medium-volume hospitals may primarily explain this weakening.