CASP9 and acute lymphoblastic leukemia: In comparison with I/R + ALL, I/R + FEB markedly decreased the Caspase-3 and -9 activities (Caspase-3: 2.1 ± 0.2 vs. 2.5 ± 0.2; Caspase-9: 2.2 ± 0.1 vs. 2.9 ± 0.2, P < 0.01, respectively).