Forrest plots of prognostic factors for event-free and overall survival in univariate and multivariable analyses. Event-free/univariate (A), overall/univariate (B), event-free/multivariable (C), and overall survival/multivariable (D). High-risk WBC is >10 (10³/μL) at diagnosis. ACA indicates additional chromosomal abnormalities; CK was defined as 2 or more chromosomal abnormalities in addition to t(15;17).