Abstract
Leukemia is a cancer of hematopoietic cells, being characterized by uncontrolled and abnormal proliferation of leukocytes, impairing the production of other blood cells in the bone marrow. Acute Lymphoid Leukemia (B or T cell ALL) is the most common malignancy in children and, although diagnosis and treatment guarantee the child's survival, there are still high levels of relapse. IL-7 sig…