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The second type of classification is by type of white blood cell affected: 1  Lymphocytic leukemia. This type of leukemia affects the lymphoid cells (lymphocytes), which form lymphoid or lymphatic tissue. 2  Myelogenous (my-uh-LOHJ-uh-nus) leukemia. This type of leukemia affects the myeloid cells.
The treatment and prognosis for leukemia depend on the type of blood cell affected and whether the leukemia is acute or chronic. Chemotherapy is often used to treat leukemia. Leukemia is cancer of the blood cells. Most blood cells form in the bone marrow.In leukemia, cancerous blood cells form and crowd out the healthy blood cells in the bone marrow.The type of leukemia depends on the type of blood cell that has become cancerous.hemotherapy is often used to treat leukemia. Leukemia is cancer of the blood cells. Most blood cells form in the bone marrow. In leukemia, cancerous blood cells form and crowd out the healthy blood cells in the bone marrow. The type of leukemia depends on the type of blood cell that has become cancerous.