The chronic myelogenous leukemias (CMLs) include BCR rearrangement-positive CML, atypical CML, chronic myelomonocytic leukemia, juvenile myelomonocytic leukemia, chronic neutrophilic leukemia, chronic eosinophilic leukemia, and chronic basophilic leukemia (152). The gene discussed is BCR; the disease is chronic myelogenous leukemia, BCR-ABL1 positive.