acute leukemia treatment optionsacute lymphocyctic leukemiadefine acute leukemiaacute leukemia diagnosisacute myeloblastic leukemiaacute leukemia prognosisacute myelogenous leukemiaacute leukemia in the elderlyacute monocytic leukemia symptomsacute myeloid leukemiastages of acute leukemiaacute lymphoblastic leukemia prognosis