Kopp RP et al. – Multiple biopsy sessions are not associated with an increased risk of biochemical recurrence in men undergoing radical prostatectomy. Multiple biopsy sessions appear to select for a low risk cohort.Methods
- Men in the SEARCH (Shared Equal Access Regional Cancer Hospital) database who underwent radical prostatectomy between 1988 and 2010 after a known number of prior biopsies were included in the analysis.
- Number of biopsy sessions (range 1 to 8) was examined as a continuous and categorical (1, 2 and 3 to 8) variable.
- Biochemical recurrence was defined as a prostate specific antigen greater than 0.2 ng/ml, 2 values at 0.2 ng/ml or secondary treatment for an increased prostate specific antigen.
- The association between number of prior biopsy sessions and biochemical recurrence was analyzed using the Cox proportional hazards model.
- Kaplan-Meier estimates of freedom from biochemical recurrence were compared among the groups.
- Of the 2,739 men in the SEARCH database who met the inclusion criteria 2,251 (82%) had only 1 biopsy, 365(13%) had 2 biopsies and 123 (5%) had 3 or more biopsies.
- More biopsy sessions were associated with higher prostate specific antigen (p <0.001), greater prostate weight (p <0.001), lower biopsy Gleason sum (p = 0.01) and more organ confined (pT2) disease (p = 0.017).
- The Cox proportional hazards model demonstrated no association between number of biopsy sessions as a continuous or categorical variable and biochemical recurrence.
- Kaplan-Meier estimates of freedom from biochemical recurrence were similar across biopsy groups (log rank p = 0.211).