Bone Marrow and Leukemia Rates

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Leukemia* is a malignant disease (cancer) of the bone marrow and blood. It is characterized by the uncontrolled accumulation of blood cells. Leukemia is divided into four categories: myelogenous or lymphocytic, each of which can be acute or chronic. The terms myelogenous or lymphocytic denote the cell type involved. Thus, the four major types of leukemia are: •Acute Lymphocytic Leukemia

•Chronic Lymphocytic Leukemia
•Acute Myelogenous Leukemia
•Chronic Myelogenous Leukemia
Acute leukemia is a rapidly progressing disease that results in the accumulation of immature, functionless cells in the marrow and blood. The marrow often can no longer produce enough normal red blood cells, white blood cells and platelets. Anemia, a deficiency of red cells, develops in virtually all leukemia patients. The lack of normal white cells impairs the body's ability to fight infections. A shortage of platelets results in bruising and easy bleeding. Chronic leukemia progresses more slowly and allows greater numbers of more mature, functional cells to be made. New Cases

An estimated 34,810 new cases of leukemia will be diagnosed in the United States in 2005. Acute leukemias account for nearly 11 percent more of the cases than chronic leukemias. Most cases occur in older adults; more than half of all cases occur after age 67. Leukemia is expected to strike 9 times as many adults as children in 2004. (About 31,289 adults compared with 3,521 children, ages 0-19). About 30 percent of cancers in children ages 0-14 years are leukemia. The most common form of leukemia among children under 19 years of age is Acute Lymphocytic Leukemia (ALL). The most common types of leukemia in adults are acute myelogenous leukemia (AML), with an estimated 11,960 new cases this year, and chronic lymphocytic leukemia (CLL), with some 9,730 new cases this year. Chronic myelogenous leukemia (CML) is estimated to affect about 4,600 persons this year. Acute lymphocytic leukemia (ALL) will account for...
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