I am sorry that your question was unanswered for long.The causes of CMML are (as you have read);1) exposure to ionizing radiation has been suggested; increased prevalence among survivors of the atomic bombing of Hiroshima and Nagasaki. 2) benzene, a possible causes.3) acquired abnormality of chromosomes 22 and 9. Why this abnormality of chromosome occur apart from radiation and chemicals is not known. Please feel free for your follow up questions.
I would be happy to assist you further, if you need any more information.
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