Risk Factors

Leukemia

Acute myelogenous leukemia

Cigarette smoking

Chronic lymphocytic leukemia

Age: more prevalent in middle age and older patients

Polycythemia Vera

None known

Myelofibrosis

None known; triggered by a disturbance of the immune system

Myelodysplastic Syndromes

Waldenstrom Macroglobulinemia

None known

Essential Thrombocythemia

None known