This study protocol is for the second part of SpaceOAR real world study in which long term follow-up visits will be performed (up to 1 year) outside Boao Medical Tourism Pilot Zone. The SpaceOAR real world study is a retrospective and prospective, single arm, observational study (Ptotocol of SpaceOAR RWS Windchill#: 92743236). Subjects with localized T1-T2 prostate cancer who have already been injected with the SpaceOAR and have received radiotherapy or will receive radiotherapy will be enrolled, and clinical data related to radiotherapy will be collected. For subjects who have already completed radiotherapy before study kick-off, clinical data will be collected retrospectively, such as data related to radiotherapy, AE (if any) and MRI (if any). Follow up vist will be completed if applicable. For subjects who receive therapy after study kick-off, follow up visits at 2 weeks, 6weeks, 3 months and 10 months after radiotherapy will be scheduled to assess bowel, urinary and sexual function and quality of life.
