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The myeloproliferative disorders. Current clinical and laboratory considerations.

The various hemopoietic and supportive cells of the marrow may proliferate beyond physiologic boundaries in response to a number of stimuli. In certain instances, the stimuli are known, and upon their removal the myeloproliferation returns to normal boundaries. These, the reactive myeloproliferations, are best represented by the leukemoid states and the secondary polycythemias. In other cases, the stimuli responsible for the myeloproliferation remain unknown and the clinical disease ends fatally. These, the neoplastic myeloproliferations, include the granulocytic, monocytic and red cell leukem