Panel A shows Kaplan–Meier estimates of modified progression-free survival, by treatment group, according to the independent review committee. The hazard ratio for treatment with A+AVD versus ABVD and the 95% confidence intervals (CIs) were based on a stratified Cox proportional-hazards regression model, with treatment as the explanatory variable. Stratification factors included region and International Prognostic Score risk group at baseline. Panel B shows Kaplan–Meier estimates of modified progression-free survival, by treatment group, according to investigators. In Panels A and B, circles indicate censored data. A+AVD denotes brentuximab vedotin plus doxorubicin, vinblastine, and dacarbazine, and ABVD doxorubicin, bleomycin, vinblastine, and dacarbazine.