Blood Res 2018; 53(4): 268  https://doi.org/10.5045/br.2018.53.4.268
Methotrexate-induced myelodysplasia mimicking myelodysplastic syndrome
Yuuki Kawase1, Masashi Ohe1*, Haruki Shida1, Tetsuya Horita1, Ken Furuya1, and Satoshi Hashino2

1Department of Internal Medicine, JCHO Hokkaido Hospital, Sapporo, Japan.

2Health Care Center, Hokkaido University, Sapporo, Japan.

Correspondence to: Correspondence to Masashi Ohe, M.D., Ph.D., Department of Internal Medicine, JCHO Hokkaido Hospital, 1-8-3-18 Nakanoshima, Toyohira-ku, Sapporo 062-8618, Japan, masshi@isis.ocn.ne.jp
Received: February 2, 2018; Accepted: May 10, 2018; Published online: December 17, 2018.
© The Korean Journal of Hematology. All rights reserved.

cc This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/4.0)which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
 

figure

An 81-year-old man with rheumatoid arthritis, who had been receiving methotrexate (MTX) (4 mg/wk) and prednisolone (5 mg/day) for five years, was diagnosed with pancytopenia during a routine examination. His white blood cell count, hemoglobin level, and platelet count were 3,630/µL, 7.9 g/dL, and 59.0×103/µL, respectively. Bone marrow aspiration demonstrated normocellular bone marrow. The aspiration smear showed a neutrophil with hypersegmentation (A), erythroblasts with abnormal nuclei (B), and a micromegakaryocyte (C) (×1,000, Wright-Giemsa stain). No chromosomal aberrations were observed. Based on the myelodysplastic morphology of bone marrow cells, he was initially diagnosed with MTX-related myelodysplastic syndrome (MDS). MTX administration was discontinued, and concentrated red blood cells were transfused. As a result, his pancytopenia alleviated over a 2-month period. MTX is known to suppress DNA synthesis by inhibiting dihydrofolate reductase; its chromosome-breaking effect damages both bone marrow and inflammatory cells. Therefore, it appeared that MTX cessation alleviated the patient's pancytopenia. Subsequently, he was diagnosed with MTX-induced myelodysplasia. Although bone marrow aspiration was not performed again, this myelodysplasia was thought to be transient. Thus, clinicians should consider MTX-induced myelodysplasia mimicking MDS because it can be safely treated with drug withdrawal.



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