The fifth edition of the WHO Classification has updated the name of atypical chronic myeloid leukemia, BCR::ABL1-negative (aCML), and replaced it with myelodysplastic syndrome/myeloproliferative neoplasms with neutrophilia (MDS/MPN with neutrophilia) [3], while the ICC has kept the original name [4]. The gene discussed is ABL1; the disease is myelodysplastic syndrome.