Established from the peripheral blood of a 6-month-old girl with acute megakaryoblastic leukemia (AML M7) at diagnosis in 1987; subline of the growth factor-independent cell line M-07; M-07e cells respond proliferatively to GM-CSF, IFN-alpha, IFN-beta, IFN-gamma, IL-2, IL-3, IL-4, IL-6, IL-15, NGF, SCF, TNF-alpha, TPO; we have noted that the cell line can become very quickly cytokine-independent (within 3-4 weeks), presumably due to outgrowth of independent cells