Sep 152026 The Viral Side of Bladder Cancer: BK Polyomavirus, HPV, and Urothelial Carcinoma APOBEC BK polyomavirus. BKPyV Bladder cancer risk factors. Epstein-Barr Virus. Genomic instability. GU Oncology. HPV16 HPV18 Human papillomavirus. Immuno-oncology. Immunosuppression.