Myeloid/lymphoid neoplasms with eosinophilia and tyrosine kinase gene fusions: reevaluation of the defining characteristics in a registry-based cohort

In a registry-based analysis of 135 patients with “myeloid/lymphoid neoplasms with eosinophilia and tyrosine kinase gene fusions” (MLN-TK; FIP1L1::PDGFRA, n = 78; PDGFRB, diverse fusions, n = 26; FGFR1, diverse, n = 9; JAK2, diverse, n = 11; ETV6::ABL1, n = 11), we sought to evaluate the disease-def...

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Hauptverfasser: Metzgeroth, Georgia (VerfasserIn) , Steiner, Laurenz (VerfasserIn) , Naumann, Nicole (VerfasserIn) , Lübke, Johannes (VerfasserIn) , Kreil, Sebastian (VerfasserIn) , Fabarius, Alice (VerfasserIn) , Haferlach, Claudia (VerfasserIn) , Haferlach, Torsten (VerfasserIn) , Hofmann, Wolf-Karsten (VerfasserIn) , Cross, Nicholas C. P. (VerfasserIn) , Schwaab, Juliana (VerfasserIn) , Reiter, Andreas (VerfasserIn)
Dokumenttyp: Article (Journal)
Sprache:Englisch
Veröffentlicht: September 2023
In: Leukemia
Year: 2023, Jahrgang: 37, Heft: 9, Pages: 1860-1867
ISSN:1476-5551
DOI:10.1038/s41375-023-01958-1
Online-Zugang:Verlag, kostenfrei, Volltext: https://doi.org/10.1038/s41375-023-01958-1
Verlag, kostenfrei, Volltext: https://www.nature.com/articles/s41375-023-01958-1
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Verfasserangaben:Georgia Metzgeroth, Laurenz Steiner, Nicole Naumann, Johannes Lübke, Sebastian Kreil, Alice Fabarius, Claudia Haferlach, Torsten Haferlach, Wolf-Karsten Hofmann, Nicholas C. P. Cross, Juliana Schwaab and Andreas Reiter

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245 1 0 |a Myeloid/lymphoid neoplasms with eosinophilia and tyrosine kinase gene fusions  |b reevaluation of the defining characteristics in a registry-based cohort  |c Georgia Metzgeroth, Laurenz Steiner, Nicole Naumann, Johannes Lübke, Sebastian Kreil, Alice Fabarius, Claudia Haferlach, Torsten Haferlach, Wolf-Karsten Hofmann, Nicholas C. P. Cross, Juliana Schwaab and Andreas Reiter 
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520 |a In a registry-based analysis of 135 patients with “myeloid/lymphoid neoplasms with eosinophilia and tyrosine kinase gene fusions” (MLN-TK; FIP1L1::PDGFRA, n = 78; PDGFRB, diverse fusions, n = 26; FGFR1, diverse, n = 9; JAK2, diverse, n = 11; ETV6::ABL1, n = 11), we sought to evaluate the disease-defining characteristics. In 81/135 (60%) evaluable patients, hypereosinophilia (>1.5 × 109/l) was observed in 40/44 (91%) FIP1L1::PDGFRA and 7/7 (100%) ETV6::ABL1 positive patients but only in 13/30 (43%) patients with PDGFRB, FGFR1, and JAK2 fusion genes while 9/30 (30%) patients had no eosinophilia. Monocytosis >1 × 109/l was identified in 27/81 (33%) patients, most frequently in association with hypereosinophilia (23/27, 85%). Overall, a blast phase (BP) was diagnosed in 38/135 (28%) patients (myeloid, 61%; lymphoid, 39%), which was at extramedullary sites in 18 (47%) patients. The comparison between patients with PDGFRA/PDGFRB vs. FGFR1, JAK2, and ETV6::ABL1 fusion genes revealed a similar occurrence of primary BP (17/104, 16% vs. 8/31 26%, p = 0.32), a lower frequency (5/87, 6% vs. 8/23, 35%, p = 0.003) of and a later progression (median 87 vs. 19 months, p = 0.053) into secondary BP, and a better overall survival from diagnosis of BP (17.1 vs. 1.7 years, p < 0.0008). We conclude that hypereosinophilia with or without monocytosis and various phenotypes of BP occur at variable frequencies in MLN-TK. 
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