association between preoperative urethral parameters on MRI and continence; (2) To estimate the risk of incontinence using different cut off values; (3) To assess interobserver variability in measuring urethral parameters. METHODS: We conducted a retrospective review of patients who underwent robot-assisted robotic Prostatectomy (RARP) by a high volume single surgeon. Patients who received previous treatment, adjuvant therapy (ie. Radiotherapy or hormonal therapy) or were lost to follow up were excluded from the study. Baseline patient characteristics were obtained: age, BMI, ASA, prostate volume, IPSS, PSA, estimated blood loss, Gleason score, pelvic lymph node dissection, staging, nerve sparing, surgical margin status, and complications. Continence was defined as no pad or a safety pad. MRI variables such as MUL, IUL, and MUT were measured by consultant uro-radiologist, uro-oncology fellow, and consultant urologist. Multivariate logistic regression analyses were performed to identify predictors of incontinence. Interclass correlation was used to evaluate interobserver variability. RESULTS: 190 patients met the study inclusion criteria. The mean age was 62 years. The mean MUL was 14.6cm (6-24). Age and MUL were significantly associated with incontinence outcome at im- mediate, 3, 6 and 12 months postoperatively. After age adjustment, MUL remained to be a significant predictor. The area under the ROC curve for continence based on MUL was 0.79 at 12 months. The risk of incontinence in patients with MUL of <10mm was 32.4% (19.5%, and 44.7% for patients <65 years of age, and ¼65, respectively). Conversely, the risk of incontinence with MUL > 15mm was 1.3% (0.8%, and 2.2% for patients <65 years, and ¼65, respectively). The concordance rate between different observers was 89% for coronal MUL but 77%, 74% and 62% for sagittal MUL, MUT and for IUL, respectively. CONCLUSIONS: Our study confirmed the significance of MUL on the continence outcome following RARP. There was also excellent consistency in measuring MUL between different observers. This could mean that urologists can reliably measure and predict urinary inconti- nence. Although a larger, prospective study would be required to verify our findings, we support the significance of MUL in predicting the risk of incontinence and need to incorporate it as part of preoperative assessment and counselling. Source of Funding: Nil MP05-14 EXTERNAL VALIDATION AND EVALUATION OF THE NEW FIVE- TIERED PROSTATE CANCER GRADING SYSTEM FOR THE RADICAL PROSTATECTOMY POPULATION IN KOREA Min Hyun Cho, Sangjun Yoo*, Juhyun Park, Soonho Kang, Gwan Jang, Dongyoung Seon, Inyoung Sun, Seung-Ee Kim, Hyukdal Jung, Youngcheol Hwang, Sung Yong Cho, Min Chul Cho, Hwancheol Son, Chang Wook Jeong, Ja Hyeon Ku, Cheol Kwak, Hyeon Hoe Kim, Hyeon Jeong, Seoul, Korea, Republic of INTRODUCTION AND OBJECTIVES: In 2014, a new grading system for prostate cancer has been introduced by the International Society of Urological Pathology (ISUP), which divided Gleason score into 5 groups We evaluated the prognostic value of the five-tiered grade group in Korean patients who underwent radical prostatectomy for prostate cancer. METHODS: Between 1996 and 2016, a total number of 2,883 consecutive patients who underwent radical prostatectomy were included for the analysis. The impacts of Gleason grade group on predicting biochemical recurrence were assessed using multivariable analysis. Median follow-up duration was 49.0 months. RESULTS: The median age of patients was 66.5 years and the median PSA level was 11.8 ng/ml. Pathologic Gleason grade group was 1 in 902 (31.3%), 2 in 1,094 (37.9%), 3 in 583 (20.2%), 4 in 136 (4.7%) and 5 in 168 patients (5.8%). The 5-year BCR-free survival was as follows: 89.0% in group 1, 78.6% in group 2, 63.0% in group 3, 54.8% in group 4, and 47.8% in group 5. In multivariable analysis pathologic Gleason grade group (group 1, reference, group 2, HR; 1.882, p<0.001, group 3, HR; 3.352, p<0.001, group 4, HR: 3.890, p<0.001, group 5, HR: 3.118, p<0.001) was significantly associated with BCR-free sur- vival in addition to pathologic T stage (T2 or less: reference, T3a, HR: 1.590, p<0.001, T3b, HR: 1.830, p¼0.001) and positive surgical margin (HR: 1.736, p<0.001). CONCLUSIONS: Although new five-tiered Gleason grading system showed promising results for predicting oncological outcomes, its role in patients with Gleason grade 3-5 thought to be limited. Before wide application of this grade system in Korea, further studies with large number of patients though to be needed. Source of Funding: None MP05-15 THE EORTC QLQ-C30 QUESTIONNAIRES PREDICTS EARLY AND LONG-TERM INCONTINENCE IN PATIENTS TREATED WITH ROBOTIC RADICAL PROSTATECTOMY: ANALYSIS OF A LARGE SINGLE CENTER COHORT Cosimo De Nunzio*, Rome, Italy; Antonio Luigi Pastore, Latina, Italy; Riccardo Lombardo, Fabiana Cancrini, Rome, Italy; Antonio Carbone, Andrea Fuschi, Latina, Italy; Lorenzo Dutti, John H. Witt, Gronau, Germany; Andrea Tubaro, Rome, Italy INTRODUCTION AND OBJECTIVES: Several risk factors including age, sexual function, surgical technique, patients’ character- istics including health status and quality of life have been associated with post radical retropubic prostatectomy incontinence. The aim of our study was to evaluate possible risk factors of post radical prostatectomy urinary incontinence. METHODS: Between 2012 and 2017, all patients undergoing robotic radical prostatectomy (RRP) for prostate cancer were enrolled. Demographic, clinical and histological characteristics of the patients were recorded. Erectile dysfunction, urinary incontinence and quality of life were evaluated at baseline and at 3, 6 and 12 months post- operatively. Incontinence was evaluated with the ICIQ questionnaire, erectile dysfunction with the IIEF questionnaire and quality of life with the EORTC QLQ-C30. Incontinence was defined as ICIQ-UI short form question 3 (Q3) ¼4. Moderate/severe incontinence was defined as ICIQ-UI short form question 4 (Q4) ¼4. Multivariate logistic regression analysis were used to evaluate the risk of postoperative incontinence and of moderate/severe incontinence. e48 THE JOURNAL OF UROLOGY â Vol. 199, No. 4S, Supplement, Friday, May 18, 2018