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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.
What can be expected as leukemia progresses? Leukemia is different from many cancers, as there is no tumor. Rather, the cancerous cells are found throughout the body, in the blood or in bone marrow. Leukemia interferes with the normal production of red cells, white cells, and platelets in the bone marrow.