IKZF1 and acute lymphoblastic leukemia: In Ph-B-ALL, no significant differences were observed in OS and RFS between patients with IKZF1 deletion and those without IKZF1 deletion (2-year OS: 52.8 ± 10% vs. 60.1 ± 5%, P=0.402; 2-year RFS: 51.2 ± 10.6% vs. 54.6 ± 5.1%, P=0.48) (Figures 3A, B).