Older age and being male increase the risk of chronic myelomonocytic leukemia. Anything that increases your chance of getting a disease is called a risk factor. Possible risk factors for CMML include the following: - Older age. - Being male. - Being exposed to certain substances at work or in the environment. - Being exposed to radiation. - Past treatment with certain anticancer drugs. 
Who is at risk for Chronic Myelomonocytic Leukemia? ?