Frequency of Positive Surgical Margin at Prostatectomy and Its Effect on Patient Outcome

Table 2

Comparison of PSM rates by duration of surgical experience.

First author, yr	Number of cases	Cohort years	PSM rate
			Open	Laparoscopic	Robotic
Rodriguez 2010 [21]	400, by intervals of 100	2004–2006	—	For pT2: 28.4%–31.9% to 11.6%–11.5%*	—
Yee 2009 [22]	50, then 250	2005–2008	—	—	Cases  1–50: 36%,; 51–250: 17.6%,; 251–450: 7.5%
Liss 2008 [23]	216	2003–2007	—	—	14.8%, decr. over time 𝑃=.03, nerve-sparing increased risk 𝑃=.03
Eastham 2007 [24]	2442	1983–1990 and 1991–2004	18% versus 10%,; 𝑃=.001	—	—
Touijer 2007 [19]	1177	2003–2005	No decrease over time	Decreased over time, 𝑃=.0002	—

*First 200 cases versus last 200 cases.