TNFSF10 and urinary bladder cancer: IFN‐α induces TNF‐Related Apoptosis‐Inducing Ligand (TRAIL) expression in bladder cancer cells36, 47 and triggers apoptosis in cells expressing the appropriate cell death receptor, by Fas‐associated death‐domain‐ (FADD‐) dependent activation of caspase‐8.19, 34