Dicentric chromosome in the bone marrow of a child with megakaryoblastic leukaemia and Down''s syndrome. |
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Authors: | A O Wilkie C Kitchen A Oakhill R T Howell P J Berry |
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Affiliation: | Department of Paediatric Oncology, Bristol Children's Hospital. |
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Abstract: | A two year old girl with Down's syndrome (constitutional karyotype: 47 + 21), presenting with pancytopenia, developed acute megakaryoblastic leukaemia (AMKL). Her bone marrow contained an abnormal clone with a novel dicentric chromosome derived from chromosomes 5 and 7 (karyotype 46, XX, -5, -7, +dic (5;7) (p 13; p 11.2), +21. This case provides further evidence for a connection between chromosome 21 and this unusual form of childhood leukaemia, and raises questions about the loss of short arm material from chromosomes 5 and 7 compared with the more usual monosomy or long arm loss. |
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