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Fujishima, Naohito; Kohmaru, Junki; Koyota, Souichi; Kuba, Keiji; Saga, Tomoo; Omokawa, Ayumi; Moritoki, Yuki; Ueki, Shigeharu; Ishida, Fumihiro; Nakao, Shinji; Matsuda, Akira; Ohta, Akiko; Tohyama, Kaoru; Yamasaki, Hiroshi; Usuki, Kensuke; Nakashima, Yasuhiro; Sato, Shinya; Miyazaki, Yasushi; Nannya, Yasuhito; Ogawa, Seishi; Sawada, Kenichi; Mitani, Kinuko; Hirokawa, Makoto
Scientific reports, 01/2021, Volume: 11, Issue: 1Journal Article
Idiopathic pure red cell aplasia (PRCA) and secondary PRCA associated with thymoma and large granular lymphocyte leukemia are generally considered to be immune-mediated. The PRCA2004/2006 study showed that poor responses to immunosuppression and anemia relapse were associated with death. PRCA may represent the prodrome to MDS. Thus, clonal hematopoiesis may be responsible for treatment failure. We investigated gene mutations in myeloid neoplasm-associated genes in acquired PRCA. We identified 21 mutations affecting amino acid sequences in 11 of the 38 adult PRCA patients (28.9%) using stringent filtering of the error-prone sequences and SNPs. Four PRCA patients showed 7 driver mutations in TET2, DNMT3A and KDM6A, and 2 PRCA patients carried multiple mutations in TET2. Five PRCA patients had mutations with high VAFs exceeding 0.3. These results suggest that clonal hematopoiesis by stem/progenitor cells might be related to the pathophysiology of chronic PRCA in certain adult patients.
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