OTX1 (orthodenticle homeobox 1) is a transcription factor that functions as a sequence-specific DNA-binding regulator of RNA polymerase II 1. Primary to its role in development, OTX1 is required for proper brain morphogenesis and sense organ development. During embryogenesis, OTX1 is predominantly expressed in proliferative zones of the neocortex where it promotes neuronal differentiation 2, while functioning cooperatively with OTX2 in caudal forebrain development 1. OTX1-deficient mice display spontaneous epilepsy and multiple brain abnormalities including defects in the telencephalon, hippocampus, mesencephalon, and cerebellum, confirming its essential role in proper brain function 3. Beyond neural development, OTX1 is expressed postnatally in the anterior pituitary where it activates pituitary hormone transcription, and in hematopoietic cells where it promotes erythroid differentiation 4. In pathological contexts, OTX1 is aberrantly overexpressed in multiple cancers including breast, cervical, and gallbladder cancers 456. In cervical cancer, OTX1 promotes cell proliferation, migration, and invasion through activation of Wnt/β-catenin signaling 5. In medulloblastoma, OTX1 expression correlates with specific clinicopathological features and age, suggesting potential prognostic significance 7. These findings identify OTX1 as both a critical developmental regulator and an emerging oncogenic driver in multiple cancer types.