Cancer develops when cells in the body multiply out of control. Blood contains three kinds of cells: red cells, white cells and platelets. Any of these kinds of cells can develop into cancer cells. So instead of a tumor (a clump of cancer cells) developing, such as in
lung cancer, the tumor cells are spread throughout the blood system of the body.
Multiple myeloma is a blood cell (plasma cell) cancer and b-cell neoplasm most often diagnosed in people older than age 65. In the United States, the risk of multiple myeloma is highest among African-Americans and lowest among Asian-Americans. It is estimated that this cancer affects five to six individuals per 100,000 each year.
In Waldenstrom’s macroglobulinemia, white blood cells called "B lymphocytes" multiply out of control, invading the bone marrow, liver and spleen. People older than age 50 have the highest risk for this type of cancer. It is estimated that about 1,000 to 1,500 people are diagnosed in the United States each year with Waldenstrom’s macroglobulinemia.
Leukemia is a cancer of white blood cells. The white blood cells divide and multiply out of control, forming cancerous blast cells. Leukemia can progress quickly (acute) or slowly (chronic). Check out the
About.com Guide to Leukemia site to learn more.
The body's lymph system carries white blood cells that help fight off infections. Lymphocytes (a type of white blood cell) in the lymph system, however, can grow and multiply to create a type of cancer called "lymphoma." The
About.com Guide to Lymphoma tells you what you need to know about lymphoma.
Specialized Medical Treatment
Blood cell cancers require special types of medical treatment depending on the type of cancer, how advanced it is and whether it has spread to other parts of the body. A hematologist-oncologist is a doctor with special training in the diagnosis and treatment of blood cell cancers. A primary care doctor would refer you to this type of specialist to confirm the diagnosis and develop the best course of treatment for you or your loved one.
