Leukimia or blood cancer is a diverse group of neoplastic diseases, are not characterized by normal or malignant transformation of blood-forming cells in bone marrow and lymphoid tissues.Normal cells in the bone marrow was replaced by normal or abnormal cells. These abnormal cells out of the marrow and can be found in the peripheral blood or peripheral blood. Hematopoiesis or leukemia cells affect the formation of normal blood cells and immune patients.
The word leukemia means white blood, because the people found a lot of white blood cells before therapy was given. White blood cells are cells that look much younger, for example promielosit. This raised the amount that can disrupt the normal function of other cells.
Leukemia can be classified on the basis of:
Natural history of disease: acute and chronic
Acute leukemia is characterized by a very rapid course of the disease, lethal, and worse. If not treated promptly, the patient may die in a matter of weeks to days. While the course of the disease have chronic leukemia is not so fast that it has a longer life expectancy, up to more than 1 year even reached 5 years.