Leukemia Leukemia is a cancer that has had a significant effect on our society and with the developments of new drugs it may become treatable. Leukemia originates in the blood-forming organs which may include the lymph tissue and bone cells. In a person with leukemia the rate and the number of cells produced is altered. This altering can become fatal, or with proper treatment it can be subdued. There are two main types of leukemia which include "total" and "differential." These are mainly characterized by the appearance of white blood cells. When leukemia attacks the blood cells, the bone marrow (where blood cells are made), the spleen, and the lymph nodes are extremely weakene