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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.
Acute leukemia happens when most of the abnormal blood cells stay immature and canât carry out normal functions. It can get bad very fast. Chronic leukemia happens when there are some immature cells, but others are normal and can function normally. That means it gets bad, but more slowly.