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Tumor volume as a predictor of adverse pathologic features and biochemical recurrence (BCR) in radical prostatectomy specimens: A tale of two methods

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Abstract

Purpose

The prognostic value of tumor volume in predicting biochemical recurrence after prostatectomy has been debated. Our aim in this study was to (a) evaluate tumor volume as an independent predictor of adverse pathologic outcomes and BCR and (b) determine the effect of two different methods of tumor volume estimation.

Methods

We reviewed the charts of 3,087 patients who underwent radical prostatectomy at Vanderbilt University Medical Center between 2000 and 2008; of which 1,747 patients had data sufficient for analysis. Prostate specimens were processed as whole mount between 2000 and 2003 and then via systematic sampling from 2003 to 2008, with tumor volume measured by planimetry in the whole-mount group and tumor volume estimated by percent tumor involvement in the systematic sampling group.

Results

Tumor volume estimates were higher with SS than with WM. There were significant associations between larger tumor volume and adverse pathological outcomes, regardless of pathologic method (all with P < 0.001). Controlling for other pathologic parameters, tumor volume was an independent predictor of PGS, EPE, and SM in logistic regression models (P < 0.001 for TV in all models). Tumor volume was demonstrated to be an independent predictor of BCR in the WM group (1.06, 95% CI 1.01–1.11, P = 0.013), though tumor volume was not a significant predictor of BCR in the SS group.

Conclusions

Though the prognostic value of tumor volume is debated, our data demonstrate that tumor volume, when calculated via planimetry on whole-mount pathologic sectioning, is a significant predictor of biochemical recurrence after prostatectomy.

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Abbreviations

TV:

Tumor volume

SS:

Systematic sampling

WM:

Whole mount

PGS:

Pathologic gleason score

EPE:

Extraprostatic extension

SM:

Positive surgical margin

LNI:

Lymph node involvement

SVI:

Seminal vesicle invasion

PTI:

Percent tumor involvement

BCR:

Biochemical recurrence

RALP:

Robotic assisted laparoscopic prostatectomy

RRP:

Retropubic radical prostatecomy

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No author or contributor to this paper has any conflict of interest to disclose related to this research project or the sponsorship thereof.

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Correspondence to Daniel A. Barocas.

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Thompson, I.M., Salem, S., Chang, S.S. et al. Tumor volume as a predictor of adverse pathologic features and biochemical recurrence (BCR) in radical prostatectomy specimens: A tale of two methods. World J Urol 29, 15–20 (2011). https://doi.org/10.1007/s00345-010-0611-x

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  • DOI: https://doi.org/10.1007/s00345-010-0611-x

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