CBFA2T3 functions as a master transcriptional corepressor that plays critical roles in hematopoiesis and leukemogenesis 1. The protein regulates cell-fate genes and establishes gene expression signatures associated with leukemia stem cell transformation and relapse in acute myeloid leukemia (AML) 1. Mechanistically, CBFA2T3 inhibits retinoic acid receptor target gene expression by regulating histone acetyltransferase recruitment, histone acetylation, and chr16 accessibility at RARα target sites, thereby blocking myeloid differentiation 2. The gene is particularly significant in pediatric malignancies through oncogenic fusion proteins. CBFA2T3-GLIS2 fusions result from cryptic chromosome 16 inversions and represent the most frequent chimeric oncogene in pediatric non-Down syndrome acute megakaryoblastic leukemia, characterizing an extremely aggressive subtype with 15-30% overall survival rates 34. This fusion is pediatric-specific and drives leukemogenesis through GLIS2-mediated oncogenic properties 4. Additionally, CBFA2T3 alterations occur in group 4 medulloblastoma, where mutations affecting CBFA2T2, CBFA2T3, and related genes converge on the CBFA complex, causing differentiation blockade in cerebellar progenitor cells 5. The protein's role in maintaining stem cell signatures makes it a potential therapeutic target for enhancing differentiation therapies.