What is Acute-Lymphocytic-Leukemia-ALL

Acute lymphoblastic leukemia (ALL), also known as acute lymphocytic leukemia, is a cancer of the white blood cells, characterised by the overproduction and continuous multiplicatio...

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Acute Lymphocytic Leukemia (ALL) Information

Acute lymphoblastic leukemia (ALL), also known as acute lymphocytic leukemia, is a cancer of the white blood cells, characterised by the overproduction and continuous multiplication of malignant and immature white blood cells (referred to as lymphoblasts) in the bone marrow. It is a hematological malignancy. It is fatal if left untreated as ALL spreads into the bloodstream and other vital organs quickly (hence "acute"). It mainly affects young children and adults over 50.

Diagnosing leukemia usually begins with a medical history and physical examination. If there is a suspicion of leukemia, the patient will then proceed to undergo a number of tests to establish the presence of leukemia and its type. Patients with this constellation of symptoms will generally have had blood tests, such as a full blood count.

These tests may include complete blood count (blasts on the blood film generally lead to the suspicion of ALL being raised). Nevertheless, 10% have a normal blood film, and clinical suspicion alone may be the only reason to perform a bone marrow biopsy, which is the next step in the diagnostic process.

Bone marrow is examined for blasts, cell counts and other signs of disease. Pathological examination, cytogenetics (e.g. presence of the Philadelphia chromosome) and immunophenotyping establish whether the "blast" cells began from the B lymphocytes or T lymphocytes.

If ALL has been established as a diagnosis, a lumbar puncture is generally required to determine whether the malignant cells have invaded the central nervous system (CNS).

Lab tests (mentioned above) and clinical information may also be used to determine whether other medical imaging (such as ultrasound or CT scanning) may be required to find invasion of other organs such as the lungs or liver.

The earlier acute lymphocytic leukemia is detected, the more effective the treatment. The aim is to induce a lasting remission, defined as the absence of detectable cancer cells in the body (usually less than 5% blast cells on the bone marrow).

Treatment for acute leukemia can include chemotherapy, steroids, radiation therapy, intensive combined treatments (including bone marrow or stem cell transplants), and growth factors.

Chemotherapy is the initial treatment of choice. Most ALL patients end up receiving a combination of different treatments. There are no surgical options, due to the body-wide distribution of the malignant cells.

As the chemotherapy regimens can be intensive and protracted (often about 2 years in case of the GMALL or UKALL protocols; about 3 years for males on COG protocols), many patients have an intravenous catheter inserted into a large vein (termed a central venous catheter or a Hickman line).

Radiation therapy is used on painful bony areas, in high disease burden, or as part of the preparations for a bone marrow transplant (total body irradiation). Radiation in the form of whole brain radiation is also used for central nervous system prophylaxis, to prevent recurrence of leukemia in the brain.

ALL accounts for approximately 80 per cent of all childhood leukemia cases, making it the most common type of childhood cancer. It has a peak incident rate of 2-5 years old, decreasing in incidence with increasing age before increasing again at around 50 years old. ALL is slightly more common in males than females

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