WHAT IS LEUKEMIA?
Leukemia develops when blood stem cells in the bone marrow change and no longer grow or behave normally. These abnormal cells are called leukemia cells. Over time, the leukemia cells crowd out normal blood cells so that they can’t do their jobs.
There are many different types of leukemia. They are grouped based on the type of blood stem cell they developed from. Lymphocytic leukemias (also known as lymphoblastic leukemias) develop from abnormal lymphoid stem cells. Myelogenous leukemias develop from abnormal myeloid stem cells.
The types of leukemiaare further grouped based on how quickly the leukemia develops and grows. Acute leukemias start suddenly, developing within days or weeks. Chronic leukemias develop slowly over months or years.
The 4 main types of leukemia are acute lymphocytic leukemia (ALL), acute myelogenous leukemia (AML), chronic lymphocytic leukemia (CLL) and chronic myelogenous leukemia (CML).
In adults, CLL and AML are the most common leukemias. There are many different subtypes of leukemia.
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