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The new diagnostic criteria for myelodysplasia-related acute myeloid leukemia is useful for predicting clinical outcome: comparison of the 4th and 5th World Health Organization classifications

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Abstract

Mutations in myelodysplasia-related (MR) genes, rather than morphological features, have been included in the diagnostic criteria of the new 5th World Health Organization (WHO) classification for myelodysplastic syndrome (MDS)-associated acute myeloid leukemia (AML). This study compares the clinical relevance of the new criteria with those of the previous version. In a cohort of 135 patients with newly diagnosed AML, the MDS-related AML patients were classified according to the 5th and 4th edition of the WHO classification (AML, myelodysplasia-related [AML-MR5th] and AML with myelodysplasia-related changes [AML-MRC4th], respectively). The median age of the patients was 70.4 years. MR gene mutations were found in 48 patients (35.6%). Sixty-one patients (46.6%) were diagnosed with AML-MRC4th, while 71 patients (53.0%) were diagnosed with AML-MR5th. Patients with AML-MR5th were significantly older with significantly lower treatment response rate, higher recurrence rate, and shorter relapse-free survival after chemotherapy, whereas AML-MRC4th patients did not show any association with the treatment outcome. Overall, the following prognostic factors for survival were identified: age over 75 years, antecedent MDS or MDS/myeloproliferative neoplasm, chromosome 5 or 7 abnormalities, and KRAS and ZSZR2 mutations. The 5th WHO classification is more useful for predicting the treatment response of patients with AML-MR than the previous version. Among the MR genes, ZSZR2 mutations were found to be independent prognostic factors affecting survival.

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Funding

This work was supported by the research grant of the Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education (grant number 2020R1G1A1004157).

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Conceptualization: HS Park and J Kwon; methodology: HS Park, BR Son, and J Kwon; investigation: HS Park, HK Kim, HS Kim, Y Yang, and J Kwon; formal analysis: HS Park and J Kwon; writing — original draft preparation: HS Park and J Kwon; writing — review and editing: HK Kim, HS Kim, Y Yang, HS Han, BR Son and KH Lee; funding acquisition: J Kwon; supervision: BR Son, HS Han, KH Lee, and J Kwon.

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Correspondence to Jihyun Kwon.

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This study was approved by the Institutional Review Board of Chungbuk National University (CBNU-2018–05-006–001). All samples and data were obtained with informed consent, following institutional review board-approved protocols, and in accordance with the Declaration of Helsinki.

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Informed consent was obtained from all individuals participating in the study.

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Park, H.S., Kim, H.K., Kim, Hs. et al. The new diagnostic criteria for myelodysplasia-related acute myeloid leukemia is useful for predicting clinical outcome: comparison of the 4th and 5th World Health Organization classifications. Ann Hematol 101, 2645–2654 (2022). https://doi.org/10.1007/s00277-022-05002-7

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