SIX1 is a transcription factor that plays critical dual roles in development and cancer progression. During embryonic development, SIX1 regulates organ formation including kidney, muscle, and inner ear development, often functioning through interactions with EYA family proteins 1. Mutations in SIX1 cause branchio-oto-renal syndrome, characterized by hearing loss, auricular malformations, and renal anomalies 1. In cancer contexts, SIX1 exhibits complex, context-dependent functions. It promotes tumorigenesis in breast cancer by enhancing stemness, regulating cancer stem cell markers, and controlling metabolic reprogramming through direct transcriptional activation of glycolytic genes via the Warburg effect 23. SIX1 also coordinates with HIF1A to promote triple-negative breast cancer progression 4. However, in Ewing sarcoma, SIX1 unexpectedly functions as an anti-metastatic factor by co-regulating target genes with EWS/FLI1, including integrins that control cell migration and invasion 5. Additionally, SIX1 participates in inflammatory regulation through a NIK-SIX signaling axis that provides negative feedback control of non-canonical NF-κB signaling 6. These diverse functions highlight SIX1's importance as both a developmental regulator and potential therapeutic target in cancer.