A myelodysplastic/myeloproliferative disorder characterized by myelodysplasia associated with bone marrow and peripheral blood patterns similar to CHRONIC MYELOID LEUKEMIA, but cytogenetically lacking a PHILADELPHIA CHROMOSOME or bcr/abl fusion gene (GENES, ABL).

Synonyms: Myeloid Leukemias, Philadelphia-Negative Leukemia, Ph1-Negative Myelogenous Ph1-Negative Myeloid Leukemia Leukemia, Myeloid, Philadelphia-Negative Myeloid Leukemia, Philadelphia-Negative Philadelphia-Negative Myeloid Leukemia Leukemia, Ph1-Negative Myeloid Myelogenous Leukemia, Ph1-Negative Leukemia, Myeloid, Ph1-Negative Leukemias, Philadelphia-Negative Myeloid Leukemia, Myelogenous, Ph1 Negative Leukemias, Ph1-Negative Myeloid Leukemias, Ph1-Negative Myelogenous Ph1-Negative Myelogenous Leukemias Philadelphia-Negative Myeloid Leukemias Leukemia, Philadelphia-Negative Myeloid Leukemia, Myelogenous, Ph1-Negative Myelogenous Leukemia, Ph1 Negative Leukemia, Myeloid, Ph1 Negative Myeloid Leukemias, Ph1-Negative Leukemia, Myeloid, Philadelphia Negative Leukemia, Myeloid, Chronic, Atypical Leukemia, Myeloid, Chronic, Atypical, BCR-ABL Negative Ph1-Negative Myeloid Leukemias Ph1-Negative Myelogenous Leukemia Myelogenous Leukemias, Ph1-Negative Myeloid Leukemia, Ph1-Negative Chronic Myeloid Leukemia, Atypical Myeloid Leukemia, Philadelphia Negative Atypical Chronic Myeloid Leukemia Myeloid Leukemia, Ph1 Negative