1. Leukemia -- Information from Healthwise
In leukemia, the bone marrow starts making too many white blood cells, and sometimes these cells.. In leukemia, the bone marrow starts making too many white blood cells, and sometimes these cells don't work right..
http://www.everettclinic.com/kbase/topic/major/tv7433/descrip.htm

2. Leukemia -- Information from Health A to Z
There several types of leukemia classified as acute or chronic based on how fast the disease progresses and by the white blood cell type that is affected. In the acute leukemias, blasts multiply quickly and overcrowd the bone marrow, squeezing...
http://www.healthatoz.com/healthatoz/Atoz/dc/caz/canc/leuk/leuk_gen_ovw.jsp

3. Leukemia -- The Cleveland Clinic
Treatment for acute lymphocytic leukemia and acute myelocytic leukemia focuses on curing the disease. If leukemia develops quickly, it is called acute leukemia. Acute lymphocytic leukemia (ALL) - This type is found mostly in children, but it also...
http://www.clevelandclinic.org/health/health-info/docs/0000/0024.asp?index=4365