Univariate and multivariate prognostic analysis for OS and DFS. The Cox regression model was used for univariate and multivariate analyses of OS (A-B) and DFS (C-D), reporting hazard ratios and 95% CIs. For the construction of multivariate models, variables with a P value <.15 in univariate analyses were considered. The patient number in subgroups considered for multivariate analysis corresponds to the figures of similar subsets examined in univariate analysis. cyto, cytogenetics/genetics; ECOG, Eastern Cooperative Oncology Group; F, female; M, male.