Interactive effects of caspase 2 and 3 levels on AML patient survival. The figure shows a matrix of Kaplan-Meier survival plots for the 3 × 3 = 9 patient subgroups, determined by caspase 2 level (low, intermediate, or high) and caspase 3 level (low, intermediate, or high). In each plot the abscissa depicts survival in weeks, and the ordinate depicts survival probability. The dotted lines in each plot represent 95% confidence bands.