Leukemia is cancer of the blood cells, usually affecting the white blood cells, which causes these cells to not work properly. There are four main types of leukemia. Leukemia can occur in either the lymphoid or myeloid white blood cells. Cancer that develops in the lymphoid cells is called lymphocytic leukemia. Cancer that develops in the myeloid cells is called myelogenous leukemia. The disease can be either acute (begins abruptly and is usually short lived) or chronic (persists for a long period of time). Acute leukemia involves new or immature cells, called blasts, which remain very immature and cannot perform their functions. The blasts increase in number rapidly, and the disease progresses quickly. In chronic leukemia, there are some blasts present, but they are more mature and can perform some of their functions. The cells grow more slowly so the disease progresses gradually.it includes mainly four types of classification as 1.acute myelogenous leukemia (AML), 2.chronic myelogenous leukemia. (CML), 3. Acute lymphocytic leukemia (ALL), or 4.chronic lymphocytic leukemia (CLL).
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Last date updated on September, 2014