The hallmark finding in chronic myelogenous leukemia (CML) is which of the following?

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Multiple Choice

The hallmark finding in chronic myelogenous leukemia (CML) is which of the following?

In chronic myelogenous leukemia, the defining finding is the Philadelphia chromosome, a translocation between chromosomes 9 and 22 that creates the BCR-ABL fusion gene. This fusion produces a constitutively active tyrosine kinase that drives unchecked myeloid cell proliferation, leading to the characteristic leukocytosis with mature granulocytes and basophilia. The Philadelphia chromosome is the cytogenetic hallmark and is found in the vast majority of cases, and its detection confirms the diagnosis and guides targeted therapy with tyrosine kinase inhibitors like imatinib. Other options point to different diseases or features: the t(8;14) translocation is associated with Burkitt lymphoma; the JAK2 V617F mutation appears in other myeloproliferative neoplasms such as polycythemia vera and essential thrombocythemia; basal neutropenia is not characteristic of CML.

In chronic myelogenous leukemia, the defining finding is the Philadelphia chromosome, a translocation between chromosomes 9 and 22 that creates the BCR-ABL fusion gene. This fusion produces a constitutively active tyrosine kinase that drives unchecked myeloid cell proliferation, leading to the characteristic leukocytosis with mature granulocytes and basophilia. The Philadelphia chromosome is the cytogenetic hallmark and is found in the vast majority of cases, and its detection confirms the diagnosis and guides targeted therapy with tyrosine kinase inhibitors like imatinib. Other options point to different diseases or features: the t(8;14) translocation is associated with Burkitt lymphoma; the JAK2 V617F mutation appears in other myeloproliferative neoplasms such as polycythemia vera and essential thrombocythemia; basal neutropenia is not characteristic of CML.

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