STAT3 and renal pelvis/ureter urothelial carcinoma: Signal transducer and activator of transcription 3 (STAT3) plays a prominent role in the growth and invasion of several types of solid tumors, it has a prognostic significance of the, upper urinary tract urothelial carcinoma (UTUC) and has role in the tumerogenesis (Matsuzaki , 2018).