Acute lymphoblastic leukemia (ALL)
Acute lymphoblastic leukemia (ALL) is a progressive malignant disease, characterized by many immature white blood cells that similar to the lymphoblast. These cells can be in the blood, bone marrow, lymph nodes, spleen and other organs were found. Acute lymphoblastic leukemia in children with acute leukemia accounts for 80% of the peak incidence at 3 years old to 7 years old. ALL may also occur in adults, accounting for 20% of adult leukemia.