Comparison of EFS and OS. (A) Comparison of EFS among CALGB (gray line) and CCG (black line) patients. The 7-year RHR for CALGB patients was 2.2 (CI, 1.6-3.0; P < .001). (B) Comparison of OS among CALGB (gray line) and CCG (black line) patients. The 7-year relative hazard ratio (RHR) for death in CALGB patients was 1.9 (CI, 1.3-2.7; P < .001).