Jianzhong Ai1, Dan Wang2, Qiang Wei3, Hong Li4, Guangping Gao5. 1. Department of Urology, West China Hospital, Sichuan University, Chengdu, P.R. China; Horae Gene Therapy Center, University of Massachusetts Medical School, Worcester, MA, USA. 2. Horae Gene Therapy Center, University of Massachusetts Medical School, Worcester, MA, USA. 3. Department of Urology, West China Hospital, Sichuan University, Chengdu, P.R. China. 4. Department of Urology, West China Hospital, Sichuan University, Chengdu, P.R. China. Electronic address: lihong_19560707@163.com. 5. Horae Gene Therapy Center, University of Massachusetts Medical School, Worcester, MA, USA; Department of Microbiology and Physiology Systems, University of Massachusetts Medical School, Worcester, MA, USA; State Key Laboratory of Biotherapy, West China Hospital, Sichuan University, Chengdu, P.R. China. Electronic address: guangping.gao@umassmed.edu.