The fifth iteration of the WHO has really completely revamped the classification of acute myeloid leukemia with really heavy emphasis and focus on genomic classification of AML rather than using a blast numerical cutoff. So the genetically defined categories of AML have expanded. There are now, you know, like NPM1 mutated AML used to be a provisional category. It is now considered a bona fide category of AML...
The fifth iteration of the WHO has really completely revamped the classification of acute myeloid leukemia with really heavy emphasis and focus on genomic classification of AML rather than using a blast numerical cutoff. So the genetically defined categories of AML have expanded. There are now, you know, like NPM1 mutated AML used to be a provisional category. It is now considered a bona fide category of AML. There are other subtypes, like NUP98-rearranged AML, that has been added to the classification. There are other subtypes where the blast count requirement has been removed, such as AML with KMT2A rearrangement or AML with MECOM rearrangement. You know, the list goes on and on. We have about 20 something genetically defined categories of AML. Really the only ones that still require a blast count of 20% in the WHO category are AML with CEBPA mutation and AML with BCR-ABL translocation, obviously because of the overlap with CML because we don’t want to be over calling myeloid blast phase of CML as AML.
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