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Erschienen in: International Journal of Hematology 2/2017

29.09.2016 | Case Report

Constitutional t(8;22)(q24;q11.2) that mimics the variant Burkitt-type translocation in Philadelphia chromosome-positive chronic myeloid leukemia

verfasst von: Shinichiro Kawamoto, Katsuya Yamamoto, Masanori Toyoda, Kimikazu Yakushijin, Hiroshi Matsuoka, Hironobu Minami

Erschienen in: International Journal of Hematology | Ausgabe 2/2017

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Abstract

Constitutional translocations that coincide with t(9;22)(q34;q11.2) may lead to unnecessary treatments in chronic myeloid leukemia (CML) patients, as, under the standard criteria, a diagnosis of CML with additional chromosomal abnormalities indicates an accelerated phase (AP). In the present report, a 47-year-old male had pain in the right foot due to gout. Peripheral blood examination showed leukocytosis with left shift. Bone marrow aspiration revealed myeloid hyperplasia with megakaryocytosis. RT-PCR revealed the major BCR-ABL fusion transcript, and CML in the chronic phase was diagnosed, followed by nilotinib treatment. Although WBC counts decreased immediately, G-banding analysis showed 46,XY,t(8;22)(q24;q11.2),t(9;22)(q34;q11.2) [20]. The t(8;22)(q24;q11.2) translocation is known to be recurrent in Burkitt’s lymphoma. The diagnosis was changed to CML in AP, leading to B-lymphoid crisis. Unexpectedly, the karyotype was 46,XY,t(8;22)(q24;q11.2) [20] in hematological complete remission, even after 3 months. Fluorescence in situ hybridization on metaphase spreads revealed the MYC signal on the der(22)t(8;22), indicating that the 8q24 breakpoint was centromeric to MYC at 8q24.21. G-banding analysis of phytohemagglutinin-stimulated peripheral blood T-lymphocytes also indicated 46,XY,t(8;22)(q24.1;q11.2). We conclude that the t(8;22) is constitutional in this patient. As the tumor suppressor gene TRC8/RNF139 is disrupted by constitutional t(8;22)(q24.13;q11.21) in dysgerminoma, it may be associated with the onset of CML.
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Metadaten
Titel
Constitutional t(8;22)(q24;q11.2) that mimics the variant Burkitt-type translocation in Philadelphia chromosome-positive chronic myeloid leukemia
verfasst von
Shinichiro Kawamoto
Katsuya Yamamoto
Masanori Toyoda
Kimikazu Yakushijin
Hiroshi Matsuoka
Hironobu Minami
Publikationsdatum
29.09.2016
Verlag
Springer Japan
Erschienen in
International Journal of Hematology / Ausgabe 2/2017
Print ISSN: 0925-5710
Elektronische ISSN: 1865-3774
DOI
https://doi.org/10.1007/s12185-016-2100-5

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