Changes in pathologic outcomes and operative trends with robot-assisted laparoscopic radical prostatectomy

Abstract

Introduction:

We hypothesized that there is a reverse stage migration, or a shift toward operating on higher-risk prostate cancer, in patients undergoing robot-assisted laparoscopic prostatectomy (RALP). We therefore evaluated the stage of disease at the time of surgery for patients with prostate cancer at a large tertiary academic medical center.

Materials and Methods:

After institutional review board approval, we reviewed all patients that had undergone robotic prostatectomy. These patients were separated into three categories: An early era of 2005-2008, intermediate era of 2009-2010, and a current era of 2011-2012.

Results:

A total of 3451 patients underwent robotic prostatectomy from 2005 to 2012. The proportion men with clinical T1 tumors declined from 88.3% in the early era to 72.2% in the current era ( P < 0.0001). Men with preoperative biopsy Gleason 6 disease decreased from the early to the current era ( P < 0.0001), while men with preoperative biopsy Gleason ≥ 8 showed the opposite trend, increasing from the early to the current era ( P = 0.0002). From the early to the current era, the proportion of patients with National Comprehensive Cancer Network (NCCN) low risk prostate cancer decreased, while those with NCCN intermediate and high-risk disease increased. The proportion of pathologic T3 disease increased from 15.5% in the early to 30.6% in the current era ( P < 0.0001). On the other hand, the proportion of pathologic T2/+ SMS (surgical margin status) decreased from 6.6% in the early era to 3.1% in the current era ( P = 0.0002).

Conclusions:

We have demonstrated a reverse stage migration in men undergoing robotic prostatectomy. Despite the increasing proportion of men with extra-capsular disease undergoing RALP, the surgical margin status has remained similar. This could reflect both the changing dynamics of the population opting for surgery as well as the learning curve of the surgeons.