title: Randomized comparison between laparoscopic and robot-assisted nerve-sparing radical prostatectomy.
abstract: BACKGROUND
  Lack of randomized controlled trials (RCTs) that compare pure laparoscopic radical prostatectomy (LRP) with robot-assisted laparoscopic radical prostatectomy (RALRP) is an important gap of the literature related to the surgical treatment of the clinically localized prostate cancer (PCa).
  
  
  OBJECTIVE
  To provide the first prospective randomized comparison on the functional and oncological outcomes of LRP and RALRP for the treatment of the clinically localized PCa.
  
  
  METHODS
  Between 2007 and 2008, 128 consecutive male patients were randomized in two groups and treated by a single experienced surgeon with traditional LRP (Group I-64 patients) or RALRP (Group II-64 patients) in all cases with intent of bilateral intrafascial nerve sparing.
  
  
  METHODS
  Primary end point was to compare the 12 months erectile function (EF) outcomes. Complication rates, continence outcomes, and oncological results were also compared. The sample size of our study was able, with an adequate power (1-beta > 0.90), to recognize as significant large differences (above 0.30) between incidence proportions of considered outcomes.
  
  
  RESULTS
  No statistically significant differences were observed for operating time, estimated blood loss, transfusion rate, complications, rates of positive surgical margins, rates of biochemical recurrence, continence, and time to continence. However, the 12-month evaluation of capability for intercourse (with or without phosphodiesterase type 5 inhibitors) showed a clear and significant advantage of RALRP (32% vs. 77%, P < 0.0001). Time to capability for intercourse was significantly shorter for RALRP. Rates of return to baseline International Index of Erectile Function (IIEF-6) EF domain score questionnaires (questions 1-5 and 15) (25% vs. 58%) and to IIEF-6 > 17 (38% vs. 63%) were also significantly higher for RALRP (P = 0.0002 and P = 0.008, respectively).
  
  
  CONCLUSIONS
  Our study offers the first high-level evidence that RALRP provides significantly better EF recovery than LRP without hindering the oncologic radicality of the procedure. Larger RCTs are needed to confirm if a new gold-standard treatment in the field of RP has risen.
authors.affiliation: Department of Surgery, University of Tor Vergata, Policlinico Tor Vergata, Rome, Italy. tasospao2003@yahoo.com
authors.forename: Anastasios D
authors.initials: AD
authors.lastname: Asimakopoulos
authors.forename: Clovis T
authors.initials: CT
authors.lastname: Pereira Fraga
authors.forename: Filippo
authors.initials: F
authors.lastname: Annino
authors.forename: Patrizio
authors.initials: P
authors.lastname: Pasqualetti
authors.forename: Adriano A
authors.initials: AA
authors.lastname: Calado
authors.forename: Camille
authors.initials: C
authors.lastname: Mugnier
mesh_terms: D006801:Humans; D010535:Laparoscopy / Q000379:methods*; D008297:Male; D008875:Middle Aged; D011468:Prostatectomy / Q000009:adverse effects / Q000379:methods*; D011471:Prostatic Neoplasms / Q000601:surgery; D012371:Robotics / Q000379:methods*; D016896:Treatment Outcome