s / Urological Science 26 (2015) 294e300 300 female subjects. The hazard ratio (HR) of hysterectomy in non-IC/BPS cohort compare with IC/BPS cohort is 2.932 (95% CI1⁄4 2.018-4.261, p1⁄4 .000) after controlling the age and five comorbidities by Cox regression analysis Conclusions: Our results imply us that the incidence of hysterectomy was lower, instead of higher, in PBS/IC female patient after PBS/IC diagnosed in these matched subjects. That is, PBS/IC is a protective factor of hysterectomy for Taiwan female. The incidence of hysterectomy of PBS/IC female patient before PBS/IC diagnosed should be further investigated to clarify the relationship between PBS/IC and hysterectomy. MP4-5: OUTCOMES OF LOW-RISK PROSTATE CANCER WITH ROBOTIC-ASSISTED LAPAROSCOPIC RADICAL PROSTATECTOMY IN OUR CENTER Keng-Kok Tan, Kun-Hung Shen, Chien Liang Liu, Steven K. Huan. Division of Urology, Department of Surgery, Chi Mei Medical Center, Taiwan Purpose: In prostate cancer, very low-risk tumors are often managed well with active surveillance, low to intermediate-risk tumors generally respond well to localized treatment (surgery or radiation alone, brachytherapywith or without external-beam therapy). Intermediate to high-risk tumors often require multimodal therapy (surgery with radiation, or radiation therapy with hormonal therapy). All available treatments for prostate cancer carry a risk of complications, side effects, and other impacts to the patient's long-term quality of life. Therefore, some practice suggested active surveillance in low-risk patient to avoid over treatment and complication. However, new surgical technique and instrument development, there can decrease surgical complication and improve patient outcome. We present the outcome of low-risk prostate cancer with robotic-assisted laparoscopic radical prostatectomy (RALRP) in our institution. Materials and Methods: From April 2012 to August 2015, 128 male patients with prostate cancer underwent RALRP in Chi Mei Medical Center. We follow the NCCN prostate cancer treatment guideline in our clinical practice. Patient characteristics, DRE, PSA, Gleason score, preoperative clinical staging, postoperative data and outcomes including final pathological staging, continence, potency, biochemical recurrence, postoperative complications and surgical margins were analyzed. Results: Only 7 patients are low risk group, the rest of 121 patients are intermediate, high and very high risk group. The average age of the low risk patients was 65.3 years (47~73). Pre-op mean PSA was 4.65 ng/ml (1.8~5.59), only 2 patients had palpable hard nodule while DRE, Gleason score were (3+3) in 6 patients and (2+2) in 1 patient. Post operation pathology showed margin free in all 7 cases, but 4 patients up-staging to T2c, 5 patients had total Gleason score 7 points and 6 patients shift to intermediate risk group compare to pre-op evaluation. After 6 weeks of surgery, PSA decrease to <0.01 ng/ml in all patient and during mean f/u times 19 months (9~33), no biochemical recurrence was noted. Conclusion: Although pre-op are low-risk group, but we found that more than half of the patient showed up-staging and up-grading after operation. Due to the robotic assisted system development, less complication and better outcome can be expected. May by operation can provided better oncology outcome in low-risk prostate cancer patient. MP4-6: ESWL POTENTIALLY IMPROVE RENAL FUNCTION IN UROLITHIASIS INTERVENTION. AN EXPERIENCE FROM SHOW CHWAN MEMORIAL HOSPITAL Wong Jin-Kiong , Lin Mao-Sheng , Lin Ta-Chong , Wang ChienHsiang , Chou chih-yuan , Wu Chyi-Hsiang , Hsih Hui-Lung , Chen Chao-Chih . Department of Urology, Chang Hua Show Chwan Memorial Hospital, Taiwan; Department of Urology, Chang Bin Show Chwan Memorial Hospital, Taiwan; Department of Urology, Chu Shang Show Chwan Memorial Hospital, Taiwan; 4 Sun Mei Urology Clinic, Taichung,