GFI1B expression was increased at least threefold in patients with erythroleukaemia (P < 0.01 compared with controls) and megakaryocytic leukaemia (P < 0.05) as well as in their corresponding leukaemic cell lines HEL, K562, CMK and M-07e.
This allowed the identification of an activating mutation (A572V) in the JAK3 pseudokinase domain in the acute megakaryoblastic leukemia (AMKL) cell line CMK.
Both smg p21A mRNA and smg p21B mRNA were detected in CMK, a human megakaryocytic leukemia cell line, and their levels were markedly elevated by treatment with 12-O-tetradecanoyl-phorbol-13-acetate (TPA), which caused the differentiation of this cell line into more mature megakaryocytes.