Translations:Types/leukemia/patient/child-aml-treatment-pdq/35/en

JMML is a rare childhood cancer that is most common in children around the age of 2 years and is more common in boys. In JMML, too many myeloid blood stem cells become myelocytes and monocytes (two types of white blood cells). Some of these myeloid blood stem cells never become mature white blood cells. These immature cells, called blasts, are unable to do their usual work. 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.