Leukemia with an acute onset, characterized by the presence of lymphoblasts in the bone marrow and the peripheral blood. It includes the acute B lymphoblastic leukemia and acute T lymphoblastic leukemia.
Definition (MEDLINEPLUS)
Leukemia is cancer of the white blood cells. White blood cells help your body fight infection. Your blood cells form in your bone marrow. In leukemia, however, the bone marrow produces abnormal white blood cells. These cells crowd out the healthy blood cells, making it hard for blood to do its work. In acute lymphocytic leukemia (ALL), there are too many of specific types of white blood cells called lymphocytes or lymphoblasts.
Possible risk factors for ALL include being male, being white, being older than 70, previous chemotherapy treatment, or exposure to radiation.
Symptoms of ALL include:
Weakness or feeling tired
Fever
Easy bruising or bleeding
Bleeding under the skin
Shortness of breath
Weight loss or loss of appetite
Pain in the bones or stomach
Pain or a feeling of fullness below the ribs
Painless lumps in the neck, underarm, stomach, or groin
Tests that examine the blood and bone marrow diagnose ALL. Treatments include chemotherapy, radiation therapy, stem cell transplants, and targeted immune therapy. Once the leukemia is in remission, you need additional treatment to make sure that it does not come back.
NIH: National Cancer Institute
Definition (NCI)
An aggressive (fast-growing) type of leukemia (blood cancer) in which too many lymphoblasts (immature white blood cells) are found in the blood and bone marrow.
Definition (CSP)
acute leukemia in which lymphoblasts and their progenitor cells predominate; the most common childhood cancer and accounts for 20 percent of adult acute leukemia; common ALL antigen (CALLA) expressed in most cases.