Chronic myelomonocytic leukemia is a disease in which too many myelocytes and monocytes (immature white blood cells) are made in the bone marrow.
In chronic myelomonocytic leukemia (CMML), the body tells too many blood stem cells to become two types of white blood cells called myelocytes and monocytes. Some of these blood stem cells never become mature white blood cells. These immature white blood cells are called blasts. Over time, the myelocytes, monocytes, and blasts crowd out the red blood cells and platelets in the bone marrow. When this happens, infection, anemia, or easy bleeding may occur.
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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:
Being exposed to certain substances at work or in the environment.
Being exposed to radiation.
Past treatment with certain anticancer drugs.
Possible signs of chronic myelomonocytic leukemia include fever, feeling very tired, and weight loss.
These and other symptoms may be caused by CMML. Other conditions may cause the same symptoms. Check with your doctor if you have any of the following problems:
Fever for no known reason.
Feeling very tired.
Weight loss for no known reason.
Easy bruising or bleeding.
Pain or a feeling of fullness below the ribs.
Certain factors affect prognosis (chance of recovery) and treatment options.
The prognosis (chance of recovery) and treatment options for CMML depend on the following:
The number of white blood cells or platelets in the blood or bone marrow.
Whether the patient is anemic.
The amount of blasts in the blood or bone marrow.
The amount of hemoglobin in red blood cells.
Whether there are certain changes in the chromosomes.
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This information is produced and provided by the National
Institute (NCI). The information in this topic may have changed since it was written. For the most current information, contact the National
Institute via the Internet web site at http://
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WebMD Public Information from the National Cancer Institute
September 04, 2014
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