Information from the Leukemia & Lymphoma Society® (LLS)—A Global Leader in the Fight Against Cancer
Acute Lymphoblastic Leukemia (ALL) is a type of blood cancer. About 5,430 people in the United States are diagnosed each year. It is the most common type of leukemia in children under age 15. However, people can get ALL at any age. Most children with ALL are cured of their disease after treatment.
Causes and risk factors
ALL starts with a change to a single cell in the bone marrow. Scientists are studying the exact genetic changes that cause a normal cell to become an ALL cell. ALL is not contagious (catching).
Signs and symptoms
Some signs or symptoms of ALL are similar to other more common and less severe illnesses. Specific blood tests and bone marrow tests are needed to make a diagnosis. A person with ALL may have:
Diagnosis
Blood and bone marrow tests are done to look for leukemia cells. A CBC (complete blood count) is used to help diagnose ALL. A bone marrow aspirate and a bone marrow biopsy are two of the tests that are done. There are two main cell types of ALL, B-Cell and T-Cell. Most people with ALL have the B-cell type. Most cases of the B-cell type are called precursor B-cell type. To decide the best treatment for the patient, the doctor will consider the patient's age, the number of ALL cells in the blood, if the ALL has spread to the covering of the brain or spinal cord, and if there are certain chromosomal changes.
Treatment
Patients with ALL need to start chemotherapy right away. It is important to get medical care in a center where doctors are experienced in treating patients with ALL.
Patients with ALL often have leukemic cells in the lining of the spinal cord and brain. The procedure used to check the spinal fluid for leukemic cells is called a spinal tap. The cells cannot always be found in an exam of the spinal fluid.
To prevent leukemia in the central nervous system (CNS) leukemia, all patients have the lining of the spinal cord and brain treated.
More treatment is needed even after a patient with ALL is in remission. This is called long term maintenance therapy. It is given in cycles for two to three years. Long term maintenance therapy is given because some ALL cells remain that are not found by common blood or marrow tests.
Side effects of treatment
Possible side effects of treatment for ALL include:
To lower the risk of infection:
Chemotherapy affects the parts of the body where new cells form quickly. This includes the inside of mouth and bowel, and the skin and hair. Some other chemotherapy side effects are:
Follow-up Visits
Patients who have finished all of their therapy still need to go to their doctors regularly for exams and tests. The doctor may recommend longer periods of time between follow-up visits if a patient continues to be disease free.
Treatment for ALL can cause long-term or late effects. Children should be checked for treatment effects on growth or learning that may not take place right away. It is important to identify problems early. Talk to the doctor about when your child's learning skills should be assessed. Some children will need special help with schoolwork during and after treatment.
Relapsed or Refractory ALL
Some patients have a remission after treatment but then ALL cells return later—this is called a relapse. Other patients with ALL may still have ALL cells in the marrow even after treatment (refractory leukemia).