HOXA4 is a sequence-specific transcription factor that plays critical roles in development and disease. As part of the HOX gene family, HOXA4 provides positional identity along the anterior-posterior axis during embryogenesis and exhibits region-specific expression patterns that persist into adulthood 1. The protein demonstrates spatial variation in the aorta, with higher expression in thoracic compared to abdominal regions, and its downregulation is associated with abdominal aortic aneurysms 1. In cancer biology, HOXA4 shows contrasting roles depending on tumor type. In colorectal cancer, HOXA4 is overexpressed in stem cells and promotes self-renewal, proliferation, and sphere formation, contributing to cancer stem cell overpopulation 2. Similarly, high HOXA4 expression in glioma correlates with poor prognosis and regulates cancer-related pathways including cell cycle and JAK/STAT signaling 3. Conversely, HOXA4 is downregulated in lung adenocarcinoma, where its expression negatively correlates with tumor purity and positively correlates with immune cell infiltration 4. In acute myeloid leukemia, HOXA4 expression is regulated by promoter methylation and shows differentiation-associated patterns 5. Recent studies indicate HOXA4 involvement in cardiac pathology, where its expression contributes to maladaptive remodeling following myocardial infarction 6.