Real-World Efficacy of Intravesical Gemcitabine for BCG-Unresponsive Non-muscle-Invasive Bladder Cancer. - Lee HW; Jung EH; Kim KH; Ha HK; Oh JJ; Kang SH; Jeong SH; Yuk HD; Heo JE; Ham WS; Hwang EC; Jung SI; et al. (Cancer research and treatment, 2026)