IRCT20180218038788N1 IRCT 2018-04-27 Urology and Nephrology Research Center Shahid Beheshti University of Medical Sciences evaluation of acid hyaluronic on radiation cystitis Evaluation of radiation cystitis treatment with intravesical instillation of hyaluronic acid (cystistat) 2018-02-20 anticipated 20 Complete https://irct.ir/trial/29729 interventional Randomization: Randomized, Blinding: Single blinded, Placebo: Used, Assignment: Parallel, Purpose: Treatment, Randomization description: Randomization was done from a computer-generated sequence(SAS software), concealed in sequentially numbered, sealed, opaque envelopes, and kept by the ward secretary, Blinding description: after explanation of study, all the participants and care providers are blind because patients divided to two groups by sealed envelops and same intervention was done for both groups but with different material. 3 Radiation cystitis. Intervention 1: Intervention group: in this group 40 mg(50 cc) cystistat +one vial of lidocaine 2% + one vial of heparin instilled into bladder and reserved one hour in bladder. this solution instilled for four weeks weekly and then monthly for two months. Intervention 2: Control group: in this group 50 cc normal saline +one vial of lidocaine 2% + one vial of heparin instilled into bladder and reserved one hour in bladder. this solution instilled for four weeks weekly and then monthly for two months. Undecided - It is not yet known if there will be a plan to make this available Justification or reason for indecision in sharing IPD is There is no further information