Chronic Myelogenous Leukemia (CML)

Definition

Chronic myelogenous leukemia is cancer that starts inside bone marrow, the soft tissue inside bones that helps form blood cells. The cancer grows from cells that produce white blood cells.

See also:

• Acute myeloid leukemia (CML)
• Chronic lymphocytic leukemia (CLL)
• Leukemia

Symptoms

CML causes rapid growth of the blood-forming cells (myeloid precursors) in the bone marrow, blood, and body tissues.

Chronic myelogenous leukemia is grouped into several phases:

• Chronic
• Accelerated
• Blast crisis

The chronic phase can last for months or years. The disease may have few or no symptoms during this time. Most people are diagnosed during this stage, when they are having blood drawn for other reasons.

The accelerated phase is a more dangerous phase, during which the leukemia cells grow more quickly. This phase may be associated with fever (without infection), bone pain, and a swollen spleen.

If untreated, CML progresses to the blast crisis phase. Bleeding and infection may occur due to bone marrow failure. Other possible symptoms include:

• Bleeding and bruising
• Excessive sweating (night sweats)
• Fatigue
• Low-grade fever
• Pressure under the left ribs from a swollen spleen
• Sudden appearance of small red marks on the skin (petechiae)
• Weakness

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