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Chronic leukemia mostly occurs in older people but can occur in any age group. Additionally, the diseases are subdivided according to which kind of blood cell is affected. This divides leukemias into lymphoblastic or lymphocytic leukemias and myeloid or myelogenous leukemias : [15]
CLL is primarily a disease of older adults, with 9 out of 10 cases occurring after the age of 50 years. The median age of diagnosis is 70 years. In young people, new cases of CLL are twice as likely to be diagnosed in men than in women.
CML is more common in males than in females (male to female ratio of 1.4:1) and appears more commonly in the elderly with a median age at diagnosis of 65 years. Exposure to ionising radiation appears to be a risk factor, based on a 50 fold higher incidence of CML in Hiroshima and Nagasaki nuclear bombing survivors. [5]
A myelodysplastic syndrome ( MDS) is one of a group of cancers in which immature blood cells in the bone marrow do not mature, and as a result, do not develop into healthy blood cells. [3] Early on, no symptoms typically are seen. [3] Later, symptoms may include fatigue, shortness of breath, bleeding disorders, anemia, or frequent infections. [3]
Examples of aging-associated diseases are atherosclerosis and cardiovascular disease, cancer, arthritis, cataracts, osteoporosis, type 2 diabetes, hypertension and Alzheimer's disease. The incidence of all of these diseases increases exponentially with age. [1]
Chronic myelomonocytic leukemia ( CMML) is a type of leukemia, which are cancers of the blood-forming cells of the bone marrow. In adults, blood cells are formed in the bone marrow, by a process that is known as haematopoiesis. In CMML, there are increased numbers of monocytes and immature blood cells ( blasts) in the peripheral blood and bone ...
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