HES2 is a basic helix-loop-helix (bHLH) transcriptional repressor that functions as a key regulator of cell fate determination and differentiation. As a member of the Hairy and Enhancer of split (HES) family, HES2 acts downstream of Notch signaling, where activation of Notch leads to transcriptional upregulation of HES2 through interaction between the Notch intracellular domain and CSL proteins 1. HES2 contains characteristic bHLH, Orange, and proline-rich domains, and functions to suppress tissue-specific transcriptional activators, thereby controlling stem and progenitor cell proliferation and differentiation 12. HES2 expression is detected across diverse tissues including placenta, pancreatic cancer, colon cancer, cervical cancer, and head and neck tumors 1. In normal development, HES2 is crucial for proper hair cell polarization and differentiation in sensory organs 2. Clinically, HES2 emerges as a significant player in cancer biology and reproductive physiology. In colorectal cancer, HES2 functions as a Notch target gene downstream of the tetraspanin-29/ADAM10 axis, with elevated HES2 expression correlating with enhanced oncogenic signaling 3. Additionally, HES2 is identified as a differentially expressed transcription factor regulating estrus and ovulation pathways 4, and is implicated in intestinal enterocyte differentiation and restitution following gastric bypass surgery 5. HES2 also plays roles in polydactyly development, suggesting involvement in developmental patterning 6.