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The most common form childhood leukemia is acute lymphocytic (or lymphoblastic) leukemia (ALL), which makes up 75-80% of childhood leukemia diagnoses. [7] [2] ALL is a form of leukemia that affects lymphocytes, a type of white blood cells which fights infection. When a patient has ALL, the bone marrow makes too many immature white blood cells ...
Juvenile myelomonocytic leukemia (JMML) is a rare form of chronic leukemia (cancer of the blood) that affects children, commonly those aged four and younger. [2] The name JMML now encompasses all diagnoses formerly referred to as juvenile chronic myeloid leukemia (JCML), chronic myelomonocytic leukemia of infancy, and infantile monosomy 7 syndrome.
In childhood, T-cell acute lymphoblastic leukemia (T-ALL) patients can expect a 5-year event-free survival (EFS) rate of 70% and an overall survival (OS) rate of 80%. [1] Among the approximately 25% of children who relapse, survival rates drop to 30-50%, with patients generally showing a much poorer prognosis. [ 1 ]
Large granular lymphocytic leukemia may involve either T-cells or NK cells; like hairy cell leukemia, which involves solely B cells, it is a rare and indolent (not aggressive) leukemia. [26] Adult T-cell leukemia is caused by human T-lymphotropic virus (HTLV), a virus similar to HIV. Like HIV, HTLV infects CD4+ T-cells and replicates within ...
Acute lymphoblastic leukemia represents approximately 20% of adults and 80% of childhood leukemias, making it the most common childhood cancer. [5] Although 80 to 90% of children will have a long term complete response with treatment, [ 45 ] : 1527 it remains the leading cause of cancer-related deaths among children.
T-cell leukemia describes several different types of lymphoid leukemias which affect T cells. [citation needed] The most common T-cell leukemia is precursor T-cell lymphoblastic leukemia. [1] It causes 15% of acute leukemias in childhood, and also 40% of lymphomas in childhood. [1] It is most common in adolescent males. [1]
In adults, absolute lymphocytosis is present when the lymphocyte count is greater than 5000 per microliter (5.0 x 10 9 /L), in older children greater than 7000 per microliter and in infants greater than 9000 per microliter. [1] Lymphocytes normally represent 20% to 40% of circulating white blood cells. When the percentage of lymphocytes exceeds ...
Acute megakaryoblastic leukemia (AMKL) is life-threatening leukemia in which malignant megakaryoblasts proliferate abnormally and injure various tissues. Megakaryoblasts are the most immature precursor cells in a platelet-forming lineage; they mature to promegakaryocytes and, ultimately, megakaryocytes which cells shed membrane-enclosed particles, i.e. platelets, into the circulation.