Acute myelogenous leukemias are caused by point mutations as well as severa
l different types of chromosomal translocations, but little is known about
how these genetic defects lead to disruptions in hematopoiesis and eventual
leukemogenesis. Two recent studies suggest that the resulting mutant gene
products can alter function of the transcription factor C/EBP alpha and tip
the balance from differentiation toward cancer (pages 444-451).