NCAM1 and acute promyelocytic leukemia: In patients with initial WBC counts of 3.0 × 109/L or more, RFS and CIR for 14 CD56+APL patients were significantly inferior to those for 67 CD56−APL patients (64.3% vs. 86.6%, p = 0.028, and 35.7% vs. 13.4%, p = 0.036, respectively; Figure 4), while in patients with initial WBC counts of less than 3.0 × 109/L, RFS and CIR were not significantly different between the two groups (p = 0.164 and p = 0.101, respectively).