Acute leukemia can be divided into two types, depending on the subtype of bone marrow cells affected. If immature cells that produce white blood cells, called lymphocytes, are affected, the leukemia is acute lymphoblastic or lymphocytic leukemia (ALL). This form of leukemia can occur at all ages but is most common in children. With modern treatment programs, a high percentage of children and adults can be cured. Continue reading →