FOXL1 is a forkhead box transcription factor that plays critical roles in tissue development and tumor suppression across multiple organ systems. In the gastrointestinal tract, FOXL1 marks subepithelial telocytes that form the intestinal stem cell niche, providing essential Wnt signals for epithelial proliferation and differentiation 1. During kidney development, sustained FOXL1 expression is associated with podocyte commitment in nephron progenitor differentiation 2. FOXL1 also regulates lung fibroblast function by controlling genes involved in cell growth and collagen contraction, with increased expression observed in idiopathic pulmonary fibrosis 3. As a tumor suppressor, FOXL1 expression is downregulated in multiple cancers including clear cell renal cell carcinoma and pancreatic ductal adenocarcinoma, where low expression correlates with poor prognosis, advanced tumor stage, and metastasis 45. Mechanistically, FOXL1 overexpression inhibits tumor cell proliferation, migration, and invasion while promoting apoptosis through TRAIL induction and ZEB1 suppression 5. In stromal contexts, FOXL1 is regulated by transforming growth factor β and helps modulate BMP signaling balance in cancer-associated fibroblasts 6. FOXL1 also serves as a downstream target in vascular disease gene regulatory networks 7.