title: Risk factors of positive surgical margin and biochemical recurrence of patients treated with radical prostatectomy: a single-center 10-year report.
abstract: BACKGROUND
  Many studies have shown that positive surgical margin and biochemical recurrence could impact the life of patients with prostate cancer treated with radical prostatectomy. With more and more patients with prostate cancer appeared in recent 20 years in China, it is necessary to investigate the risk of positive surgical margin and biochemical recurrence, and their possible impact on the prognosis of patients treated with radical prostatectomy. In this study, we analyzed the characteristics of patients with prostate cancer who had undergone radical prostatectomy in Macau area and tried to find any risk factor of positive surgical margin and biochemical recurrence and their relationship with the prognosis of these patients.
  
  
  METHODS
  From 2000 to 2009, 149 patients with prostate cancer received radical prostatectomy and were followed up. Among these patients, 111 received retropubic radical prostatectomies, 38 received laparoscopic radical prostatectomies. All patients were followed-up on in the 3rd month, 6th month and from that point on every 6 months after operation. At each follow-up a detailed record of any complaint, serum prostate-specific antigen (PSA), full biochemical test and uroflowmetry was acquired.
  
  
  RESULTS
  The average age was (69.0 ± 6.1) years, preoperative average serum PSA was (10.1 ± 12.1) ng/ml and average Gleason score was 6.4 ± 1.3. The incidence of total complications was about 47.7%, the incidence of the most common complication, bladder outlet obstruction, was about 26.8%, and that of the second most common complication, urinary stress incontinence, was about 16.1% (mild 9.4% and severe 6.7%). The incidence of positive surgical margin was about 38.3%. The preoperative serum PSA ((13.4 ± 17.6) ng/ml), average Gleason score (7.1 ± 1.3) and pathological T stage score (7.0 ± 1.4) were higher in patients with positive surgical margins than those with negative margins ((8.0 ± 5.8) ng/ml, 6.0 ± 1.2 and 5.4 ± 1.4, respectively) (P = 0.004, P = 0.001 and P = 0.001, respectively). A univariate analysis showed that positive surgical margin had a positive statistical association with serum PSA (P = 0.007), Gleason score (P < 0.001), pathological T stage score (P < 0.001) and biochemical recurrence (BCR) (P = 0.035). The most common location of a positive surgical margin was in the apex of the prostate, which was about 63% (36/57). Sixty-four percent (23/36) of patients with positive surgical margin in apex were also involved in prostate lobe; other locations were prostate lobe (23%, 13/57), seminal vesicle (9%, 5/57). The multivariate analysis showed that positive surgical margin had a positive statistical association with Gleason score (P = 0.03) and pathological T stage score (P = 0.02). Neither univariate analysis or multivariate analysis showed any statistical relationship between BCR and any other risk factors covered in this study.
  
  
  CONCLUSIONS
  Positive surgical margin is associated with pre-operative PSA, Gleason score, pathological T stage and biochemical recurrence. Earlier diagnosis and improved techniques of dissection of prostate apex could decrease the incidence of positive surgical margins.
authors.affiliation: Department of Urology, West China Hospital, Sichuan University, Chengdu, Sichuan 610041, China.
authors.forename: Kin
authors.initials: K
authors.lastname: Li
authors.forename: Hong
authors.initials: H
authors.lastname: Li
authors.forename: Yong
authors.initials: Y
authors.lastname: Yang
authors.forename: Lap-Hong
authors.initials: LH
authors.lastname: Ian
authors.forename: Wai-Hong
authors.initials: WH
authors.lastname: Pun
authors.forename: Son-Fat
authors.initials: SF
authors.lastname: Ho
mesh_terms: D000368:Aged; D006801:Humans; D008297:Male; D008875:Middle Aged; D017430:Prostate-Specific Antigen / Q000097:blood*; D011468:Prostatectomy / Q000379:methods*; D011471:Prostatic Neoplasms / Q000097:blood / Q000473:pathology / Q000601:surgery; D012307:Risk Factors
chemical_list: D017430:Prostate-Specific Antigen