WWTR1 (also known as TAZ) is a transcriptional coactivator functioning as a key downstream effector of the Hippo signaling pathway 12. Within this pathway, LATS1/2 kinases phosphorylate and inactivate WWTR1, thereby restricting proliferation and promoting apoptosis to control organ size and suppress tumorigenesis 2. WWTR1 acts as a mechanotransducer, relaying extracellular matrix stiffness and physical cues through Rho GTPase signaling and actomyosin cytoskeleton tension to regulate cell behavior independently of the canonical Hippo cascade 3. Mechanistically, WWTR1 integrates these signals with metabolic pathways and soluble signals to control proliferation, cell plasticity, and stem cell maintenance 45. In disease contexts, aberrant WWTR1 activation drives cancer initiation, cancer stem cell properties, chemoresistance, and metastasis across most solid tumors 67. Additionally, WWTR1 dysregulation promotes pathological fibroblast activation and extracellular matrix accumulation in pulmonary fibrosis 8. WWTR1 also mediates tumor-stromal interactions, as demonstrated by periostin-induced YAP/TAZ activation driving colorectal tumorigenesis 9. These findings identify WWTR1 as a central node coordinating environmental sensing with transcriptional programs and suggest it represents a therapeutic vulnerability in multiple diseases.