Probability curves based on Cox regression analysis models. A backward-stepping procedure (B) yielded a model with the combination of low ELA2 and high CD7 as predictive of poor survival (P < .001). A forward-stepping procedure (A) yielded a model with the combination of low PR-3 and high CD7 as predictive of poor survival (P < .001). Values of genes represent the Q-RT/PCR expression as a ratio of the gene of interest to the ABL control gene.