In most cases, no obvious cause for<unk>  can be isolated. Risk factors<unk>  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<unk>  in Hiroshima and Nagasaki nuclear bombing survivors. The rate of<unk>  in these individuals seems to peak about 10 years after the exposure.
Chronic myelogenous leukemia
Acute myeloid leukemia
Chronic neutrophilic leukemia
Myeloid leukemia
Chronic lymphocytic leukemia
Acute monocytic leukemia
Prolymphocytic leukemia
Lymphoid leukemia