types of leukemia in elderlyacute leukemia in the elderlychronic lymphocetic leukemialeukemia in elderly prognosischronic myelomonocytic leukemiachronic lymphocytic leukemiachronic lymphoma leukemiachronic myelogenous leukemiachronic eosinophilic leukemiachronic leukemia symptomchronic myeloid leukemia treatmentstreating chronic leukemia