Abstract

Aplastic anemia (AA) is a non-neoplastic bone marrow failure syndrome caused by the destruction of hematopoietic stem and progenitor cells by the immune system. However, in some cases of AA, a small number of specific clones with gene mutations are observed without clinical manifestations. Cases with mutated PIG-A, BCOR/BCORL1, or HLA class I allele clones respond better to immunosuppressive therapies (ISTs). Cases with MDS-related clones, such as DNMT3A or ASXL1 mutations, are at a higher risk for secondary MDS. In this review, I will focus on the clonal hematopoiesis (CH) in AA and discuss its clinical significance, including its impact on disease boundaries and transition. I will also discuss the pathophysiology and diagnosis of hypoplastic MDS, a type of MDS that responds to ISTs.

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