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Case Report Open Access

Acute myeloid leukemia with t(3;21)(q26.2;q22) developing following low‑dose methotrexate therapy for rheumatoid arthritis and expressing two AML1/MDS1/EVI1 fusion proteins: A case report

  • Authors:
    • Keisuke Tanaka
    • Gaku Oshikawa
    • Hiroki Akiyama
    • Shinya Ishida
    • Toshikage Nagao
    • Masahide Yamamoto
    • Osamu Miura
  • View Affiliations / Copyright

    Affiliations: Department of Hematology, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Tokyo 113‑8510, Japan
    Copyright: © Tanaka et al. This is an open access article distributed under the terms of Creative Commons Attribution License.
  • Pages: 97-102
    |
    Published online on: May 10, 2017
       https://doi.org/10.3892/ol.2017.6151
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Abstract

The t(3;21)(q26.2;q22) translocation is a rare chromosomal abnormality exhibited almost exclusively in therapy‑related myelodysplastic syndrome/acute myeloid leukemia (t‑MDS/AML) or in the blastic crisis phase of chronic myelogenous leukemia, which results in the fusion of the runt related transcription factor 1 (RUNX1, also called AML1) gene at 21q22 to the myelodysplasia syndrome 1 (MDS1)‑ecotropic virus integration site 1 (EVI1) complex locus (MECOM) at 3q26.2, generating various fusion transcripts, including AML1/MDS1/EVI1 (AME). The present study examined the case of an 84‑year‑old Japanese woman who developed t‑MDS/AML with t(3;21)(q26.2;q22) subsequent to receiving low‑dose methotrexate (MTX) treatment for rheumatoid arthritis. Following treatment with MTX for 6 years, the patient developed anemia and neutropenia, and MTX was discontinued. A total of 3 years later, the patient was diagnosed with MDS with t(3;21)(q26.2;q22) and del (5q), which progressed rapidly to AML within 3 months. The patients was subsequently treated with azacitidine and cytarabine chemotherapy, but succumbed to the disease 6 months after diagnosis. Sequencing analysis of the nested reverse transcription‑PCR products from the leukemic cells revealed the expression of two types of alternatively‑spliced AME transcripts with or without RUNX1 exon 6 sequences. Western blot analysis of the leukemic cells of the patient additionally revealed that the corresponding AME fusion protein products were expressed at high levels, and that these cells also prominently expressed CCAAT/enhancer‑binding protein α, the repression of which has been reported to be involved in leukemogenesis mediated by AME. To the best of our knowledge, the case discussed in the present study represents the first report of MDS/AML with t(3;21)(q26.2;q22) developing following low‑dose MTX therapy for rheumatoid arthritis. Nonetheless, the clinical and molecular features of the patient in the present study were representative of those patients who typically develop this disease following exposure to chemotherapy or radiotherapy for primary malignancy, which implicates MTX in the pathogenesis of t‑MDS/AML. Moreover, we confirmed the expression of two AME fusion proteins for the first time in primary leukemic cells and analyzed several cellular factors implicated in AME‑mediated leukemogenesis to gain some insight into its molecular mechanisms.
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Copy and paste a formatted citation
Spandidos Publications style
Tanaka K, Oshikawa G, Akiyama H, Ishida S, Nagao T, Yamamoto M and Miura O: Acute myeloid leukemia with t(3;21)(q26.2;q22) developing following low‑dose methotrexate therapy for rheumatoid arthritis and expressing two AML1/MDS1/EVI1 fusion proteins: A case report. Oncol Lett 14: 97-102, 2017.
APA
Tanaka, K., Oshikawa, G., Akiyama, H., Ishida, S., Nagao, T., Yamamoto, M., & Miura, O. (2017). Acute myeloid leukemia with t(3;21)(q26.2;q22) developing following low‑dose methotrexate therapy for rheumatoid arthritis and expressing two AML1/MDS1/EVI1 fusion proteins: A case report. Oncology Letters, 14, 97-102. https://doi.org/10.3892/ol.2017.6151
MLA
Tanaka, K., Oshikawa, G., Akiyama, H., Ishida, S., Nagao, T., Yamamoto, M., Miura, O."Acute myeloid leukemia with t(3;21)(q26.2;q22) developing following low‑dose methotrexate therapy for rheumatoid arthritis and expressing two AML1/MDS1/EVI1 fusion proteins: A case report". Oncology Letters 14.1 (2017): 97-102.
Chicago
Tanaka, K., Oshikawa, G., Akiyama, H., Ishida, S., Nagao, T., Yamamoto, M., Miura, O."Acute myeloid leukemia with t(3;21)(q26.2;q22) developing following low‑dose methotrexate therapy for rheumatoid arthritis and expressing two AML1/MDS1/EVI1 fusion proteins: A case report". Oncology Letters 14, no. 1 (2017): 97-102. https://doi.org/10.3892/ol.2017.6151
Copy and paste a formatted citation
x
Spandidos Publications style
Tanaka K, Oshikawa G, Akiyama H, Ishida S, Nagao T, Yamamoto M and Miura O: Acute myeloid leukemia with t(3;21)(q26.2;q22) developing following low‑dose methotrexate therapy for rheumatoid arthritis and expressing two AML1/MDS1/EVI1 fusion proteins: A case report. Oncol Lett 14: 97-102, 2017.
APA
Tanaka, K., Oshikawa, G., Akiyama, H., Ishida, S., Nagao, T., Yamamoto, M., & Miura, O. (2017). Acute myeloid leukemia with t(3;21)(q26.2;q22) developing following low‑dose methotrexate therapy for rheumatoid arthritis and expressing two AML1/MDS1/EVI1 fusion proteins: A case report. Oncology Letters, 14, 97-102. https://doi.org/10.3892/ol.2017.6151
MLA
Tanaka, K., Oshikawa, G., Akiyama, H., Ishida, S., Nagao, T., Yamamoto, M., Miura, O."Acute myeloid leukemia with t(3;21)(q26.2;q22) developing following low‑dose methotrexate therapy for rheumatoid arthritis and expressing two AML1/MDS1/EVI1 fusion proteins: A case report". Oncology Letters 14.1 (2017): 97-102.
Chicago
Tanaka, K., Oshikawa, G., Akiyama, H., Ishida, S., Nagao, T., Yamamoto, M., Miura, O."Acute myeloid leukemia with t(3;21)(q26.2;q22) developing following low‑dose methotrexate therapy for rheumatoid arthritis and expressing two AML1/MDS1/EVI1 fusion proteins: A case report". Oncology Letters 14, no. 1 (2017): 97-102. https://doi.org/10.3892/ol.2017.6151
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