Abstract
The World Health Organization's (WHO) International Agency for Research on Cancer (IARC) released the fifth edition of the Classification of Tumors of the Hematopoietic and Lymphoid Tissues, renaming myelodysplastic syndrome (MDS) to myelodysplastic neoplasm (still abbreviated as MDS). This new classification integrates next-generation sequencing data to standardize the disease's nature. The name change reflects a deeper understanding of the disease, transitioning from the vague "syndrome" to a clearly defined neoplastic disease. The new classification divides MDS into two major categories: cytogenetic abnormalities and morphological abnormalities. Cytogenetic abnormalities include MDS with low blasts and isolated 5q deletion, MDS with low blasts and SF3B1 mutation, and MDS with biallelic TP53 alterations. Morphological abnormalities include MDS with low blasts, MDS with increased blasts and hypoplastic MDS. This revision provides a foundation for precise diagnosis and treatment of MDS, further restricting the application of immunosuppressive therapy and advancing genetic research in diagnostics and therapeutics.
Published Version
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