CSF3R and atypical chronic myeloid leukemia, BCR-ABL1 negative: In addition to CNL, CSF3R alterations are frequently seen in atypical chronic myeloid leukemia (aCML), also known as myelodysplastic/myeloproliferative neoplasm with neutrophilia (MDS/MPN-N), and severe congenital neutropenia (SCN) [10,11].