Freedom from progression (FFP) according to European prognostic criteria. (A) German Hodgkin Study Group (GHSG): FFP 100% for favorable patients (solid line, n = 45) and 88% for unfavorable (dotted line, n = 42) (95% confidence interval 78.5% to 94.8%), P = 0.018. (B) European Organisation for Research and Treatment of Cancer (EORTC): FFP 97.8% for favorable patients (solid line, n = 54) and 88% (95% confidence interval 94.1% to 100%), for unfavorable (dotted line, n = 33) (95% confidence interval 77.4% to 99.8%), P = 0.04.