LEF1 and acute myeloblastic leukemia with maturation: LEF1 expression in the mid-secretory endometrium of patients with AM revealed a decrease in both LEF1 mRNA and protein levels, as indicated by RT-qPCR (Fig. 2A, p = 0.002), western blotting (Fig. 2B, p = 0.002), and IHC (Fig. 2C).