Acute lymphocytic leukemia

Acute lymphoblastic leukemia (ALL) is a progressive malignant disease characterized by a large number of immature leukocytes similar to lymphoblasts. These cells can be found in blood, bone marrow, lymph nodes, spleen and other organs. Acute lymphoblastic leukemia is the most common type in childhood. The peak age of onset is 3 to 4 years. The incidence rate is slightly higher in boys than in girls. The ratio of the two is about 1.1 to 1.6: 1. Acute lymphocytic leukemia is a malignant hematological disease caused by the unlimited increase of undifferentiated or poorly differentiated lymphocytes in hematopoietic tissue (especially bone marrow, spleen and lymph nodes).