A charge nurse is reinforcing teaching with a newly licensed nurse about risk factors for chronic myelogenous leukemia (CML). Which of the following information should the nurse include?

Rationale: A. Having another type of cancer is not a recognized risk factor for developing chronic myelogenous leukemia (CML). While some treatments for other cancers (like chemotherapy or radiation) may slightly increase leukemia risk, simply having another cancer is not a direct risk factor. B. Exposure to high levels of ionizing radiation is a known risk factor for CML. Historical data from atomic bomb survivors and certain radiation accidents demonstrate increased incidence of CML in those exposed to significant radiation. This is considered one of the primary environmental risk factors for the disease. C. While CML is associated with the Philadelphia chromosome (a genetic abnormality), this is a somatic mutation acquired during life in hematopoietic stem cells, not an inherited genetic mutation. Therefore, inherited genetic mutations are not a recognized predisposing factor. D. CML is generally not considered hereditary, and having a family history of CML does not significantly increase risk. Most cases occur sporadically due to acquired mutations in the bone marrow.