Kaplan-Meier curves. OS (A) and EFS (B) according to morphologic subtype. All other centrally reviewed leukemias were compared with the AEL of the pure erythroid subtype and the AEL of the erythroid/myeloid subtype. As shown, cases with PEL subtype had a significantly worse OS and EFS than those of the erythroid/myeloid subtype. OS (C) and EFS (D) of AEL cases according to the presence or absence of NUP98 fusion.