NR0B2 (small heterodimer partner, SHP) is an orphan nuclear receptor that functions as a transcriptional repressor in bile acid homeostasis and metabolic regulation 1. As a key component of the FXR-mediated enterohepatic signaling pathway, NR0B2 is induced by bile acids and represses CYP7A1, the rate-limiting enzyme in bile acid synthesis, helping maintain bile acid homeostasis 12. The protein acts as a negative regulator of various nuclear receptors and transcription factors, specifically inhibiting transactivation through interference with coactivator function 3. NR0B2 exhibits tumor suppressor properties, with significantly reduced expression observed in liver cancer tissues associated with poor prognosis 45. Its expression correlates with favorable relapse-free and progression-free survival in liver cancer patients, particularly Asian males with viral infection history 5. The gene is regulated by opposing cellular signaling pathways, with MAPK inhibition reducing expression while PI3K inhibition enhances it 5. Beyond liver function, NR0B2 shows broader cancer relevance, with altered expression patterns across multiple malignancies and associations with patient survival outcomes 56. Recent studies suggest NR0B2 plays important roles in gastric diseases and may serve as a therapeutic target 6.