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ALK+ large B-cell lymphoma
Type of cancer From Wikipedia, the free encyclopedia
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ALK+ large B-cell lymphoma is a type of lymphoma.[1][2]: 378 It was first reported in 1997.[2]: 378 [3][4] It is a rare, aggressive large B-cell process that shows ALK expression.[2]: 378 [3][5] It is distinct from anaplastic large cell lymphoma, a T-cell lymphoma.[2]: 564 [3][6]
Signs and symptoms
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Pathophysiology
Upregulation of ALK is mainly due to chromosomal translocation t(2;17), resulting in a fusion gene of CLTC with ALK,[4][7] but can rarely be due to t(2;5), fusing NPM1 with ALK;[2]: 378 the later is the usual finding in anaplastic large cell lymphoma (ALCL).[4][7] The t(2;17) translocation occurs in less than 1% of cases of ALK+ ALCL, but has been identified in inflammatory myofibroblastic tumors.[3]
There is no association with Epstein–Barr virus[2]: 378 [6] or HHV8,[6] or immunosuppression.[2]: 378 The cells are CD20 and CD30 negative,[8]: 306 showing weak focal expression in 3% and 6% respectively.[2]: 378 They are EMA and CD138 positive,[8]: 306 showing 100% expression respectively.[2]: 378
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Diagnosis
The median age of diagnosis is approximately late thirties to early forties.[2]: 378 [3][5] The estimates of childhood disease vary (8%,[9] 15%,[3] 30%[2]: 378 ) but it can be seen at any age.[5][8]: 306
The disease usually arises in lymph nodes, particularly the neck, but extranodal involvement, including in the gastrointestinal tract, nasal cavity, ovary and brain, has been described.[3][5] Morphologically, there are large immunoblast-like cells with large central nucleoli, often cellular clusters, with a predilection for the lymph node sinuses[2]: 378 [4][8]: 306 in a cohesive pattern that can suggest carcinoma cells.[2]: 378 [8]: 306
Treatment
Multiagent chemotherapy is given, and can result in long-term success, particularly in childhood[8]: 306 but prognosis is generally poor,[2]: 378 [3][5][9][7] particularly in higher stage disease.[9]
See also
References
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