Abstract
Background
The purpose of this article was to determine the impact of time to undetectable prostate-specific antigen (PSA) for predicting biochemical recurrence (BCR) in patients with a positive surgical margin (PSM) following radical prostatectomy (RP). A PSM is an independent predictor of BCR; however, not all patients develop BCR later on.
Methods
A retrospective analysis was conducted on 1,117 consecutive prostate cancer patients who underwent RP without neoadjuvant or adjuvant therapy from July 2005 to December 2009. Of these, 516 (46.2 %) patients without PSMs, and 214 (19.2 %) patients with PSMs who later achieved undetectable PSA, defined as <0.01 ng/ml, were identified. Patients with PSMs were stratified according to time to undetectable PSA dichotomized at 6 weeks and compared with patients without PSMs. Patients with PSMs who did not achieve undetectable PSA were excluded. BCR was defined as two consecutive increases of post-undetectable PSA ≥0.2 ng/ml.
Results
During the median follow-up of 58.2 months, patients with PSMs who achieved undetectable PSA in <6 weeks had comparable 5-year BCR-free survival rates to those without PSMs; however, patients with PSMs who achieved undetectable PSA in ≥6 weeks showed significantly lower rates compared with both patients without PSMs (59.2 vs 74.3 %; p < 0.001) and patients with PSMs who achieved undetectable PSA in <6 weeks (59.2 vs 78.8 %; p = 0.004). Among patients with PSMs, multivariate analysis revealed time to undetectable PSA at ≥6 weeks and seminal vesicle invasion to be independent predictors of BCR. No perioperative factors were associated with undetectable PSA at ≥6 weeks.
Conclusions
Patients with PSMs who achieve undetectable PSA in <6 weeks show comparable risks of BCR to patients with negative surgical margins.
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Disclosures
This work was supported by the National Research Foundation of Korea(NRF) grant funded by the Korea government (MEST) (2011-0029348).
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Koo, K.C., Tuliao, P., Komninos, C. et al. Prognostic Impact of Time to Undetectable Prostate-Specific Antigen in Patients with Positive Surgical Margins Following Radical Prostatectomy. Ann Surg Oncol 22, 693–700 (2015). https://doi.org/10.1245/s10434-014-4057-z
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DOI: https://doi.org/10.1245/s10434-014-4057-z