The prime objective of this article is to know about leukemia. Leukemia or leukaemia is a cancer of blood and bone marrow. When someone has leukemia, the body makes too various white blood cells. There are numerous kinds of leukemia. Leukemias are division of a bigger group of diseases, the blood cancers. Without treatment, leukemia may escort to death within weeks, months, or years. How long the person lives depends on the sort of leukemia.