Testicular receptor 4 (TR4), also called TAK1 or NR2C2, is an orphan receptor in a distinct subclass of the steroid hormone nuclear receptor superfamily along with TR2 . TR4 forms heterodimers with TR2 and binds to DNA elements containing direct repeats (DRs) . TR4 plays a role in various processes, including neurogenesis, spermatogenesis, RNA metabolism, and protein translation . TR4 can interact with other hormone receptors such as AR and ER to influence protein-protein binding and target gene inactivation . High expression of TR4 correlates with prostate cancer metastasis and invasion through downstream targets such as CCL2 and Ezh2 . Expression of TR4 in other cancers such as NSCLC and testicular germ cell tumors has also been associated with poor prognosis .