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Objectives: There is no recommended observation time for patients who have undergone radical prostatectomy for prostate cancer. This study was undertaken to determine the postoperative observation time by investigating the hazard rate for prostate‐specific antigen failure and other‐cause death using Weibull analysis. Methods: We included 612 patients who underwent laparoscopic radical prostatectomy for localized prostate cancer between June 2002 and December 2017. Risk classification was categorized by the D'Amico risk classification, and the patients were divided into three age groups: <60, 60–69 and ≥70 years. The hazard rates at each point were derived using Weibull analysis. The optimal observation time after laparoscopic radical prostatectomy was determined as the intersection point at which the hazard rate of other‐cause death overtakes the hazard rate of prostate‐specific antigen failure. Results: In all groups classified by age, the hazard rate of other‐cause deaths increased over time. In contrast, the hazard rate of prostate‐specific antigen failure decreased gradually. The ≥70 years age group showed the highest hazard rate. The hazard rate of prostate‐specific antigen failure was highest in the high‐risk group. The patients aged ≥70 and 60–69 years in the low‐risk group were recommended 6 years 6 months and 14 years 8 months, respectively, for observation. The remaining patients were recommended >25 years of postsurgical observation. Conclusions: The observation time after laparoscopic radical prostatectomy could be estimated by comparing the estimated hazard rates of prostate‐specific antigen failure and other‐cause death based on Weibull analysis. Urologists should pay attention to age and risk classifications for optimal postoperative observation. [ABSTRACT FROM AUTHOR]

Background: Sarcopenia, a syndrome characterized by the loss of skeletal muscle mass, has attracted attention in the field of oncology, as it reflects poor nutritional status. The present study aimed to determine the risk factors for postoperative inguinal hernia (PIH) development after robot-assisted laparoscopic radical prostatectomy (RARP) for prostate cancer, and discuss whether sarcopenia could be used as a sensitive predictor of PIH. Methods: We reviewed the medical records of 147 patients who underwent RARP at our institution. The psoas muscle volume (PMV), as an indicator of sarcopenia, was quantified from computed tomography images using a 3-dimensional image analysis system. Multivariate cox regression analyses were performed to identify independent predictors of PIH, including pre- and peri-operative factors. Results: The mean PMV was 393 cm3, and the correlation coefficient between PMV and body mass index was 0.37 (p < 0.01). The PIH-free rate at 2 years postoperatively was 78.2% among all patients. The multivariate analysis revealed that a PMV < 350 cm3 was a significant risk factor for PIH (p = 0.03; hazard ratio 2.19). Body mass index, age, prostate volume, lymph node dissection, nerve sparing, rectus muscle thickness, and console time were not related to PIH development. The PIH-free rate at 2 years postoperatively was 83.4% and 68.9% in patients with a PMV ≥ 350 cm3 and < 350 cm3, respectively (p < 0.05). Conclusions: PIH occurred significantly more frequently in patients with a PMV < 350 cm3 than in patients with a PMV ≥ 350 cm3, and a low PMV was an independent risk factor for PIH. Thus, urologists should pay attention to the cumulative incidence of IH after RARP, especially in patients with a PMV < 350 cm3. [ABSTRACT FROM AUTHOR]