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  • Original Article
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Clinical Research

Prediction of prostate cancer to urethra distance by a pretreatment nomogram: urethral thermoprotection implication in cryoablation

Abstract

Introduction:

Cryoablation is a treatment option for prostate cancer (PCa) patients. A urethral warming catheter is placed to protect the prostatic urethra from cryo-injury. Thus tissue within certain depth beneath the urethral mucosa, including PCa in that zone, is not cryoablated. Preoperative predictors of PCa-to-urethra distance are important for urologists and patients to decide if undergoing cryoablation.

Methods:

A total of 267 consecutive radical prostatectomy specimens were reviewed by a pathologist and the shortest PCa-to-urethra distance was recorded as 0 (PCa at urethra), 0.1–1 mm, 1.1–2 mm, 2.1–3 mm, 3.1–4 mm, 4.1–5 mm and >5 mm. Preoperative serum PSA (iPSA) and prostate biopsy (Bx) parameters such as highest Bx Gleason score (BxGS), number of positive cores, highest percentage of PCa/cores, bilateral disease, perineural invasion (PNI) and PCa location were also recorded. The PCa-to-urethra distance subdivided into two (3 and >3 mm) and all seven categories was correlated with iPSA and Bx parameters. Logistic and linear regression were used to analyze the data.

Results:

Patients’ median age and iPSA were 59 years and 5.28 ng ml−1, respectively. PCa-to-urethra distance was <5 mm in 163 (61%) patients, 3 mm in 48% of patients. Significant univariate associations were found between shorter PCa-to-urethra distance and increasing iPSA (P<0.0001), BxGS (P=0.0016), number of positive cores (P< 0.0001), highest percentage of PCa/cores (P< 0.0001), bilateral disease (P=0.0003), PNI (P=0.01) and PCa detected in biopsies from apex (P< 0.0001), base (P=0.001) and base/medial base (P= 0.0006). In multivariate analysis, the iPSA (log), highest percentage of PCa/cores and PCa detected in the apex were significantly associated (P<0.0001) with both versions of PCa-to-urethra distance.

Conclusions:

Increasing iPSA, highest percentage of PCa/cores and PCa detected in the apex were associated with a shorter PCa-to-urethra distance. Inclusion of these preoperative parameters in a nomogram will help estimating the PCa-to-urethra distance and identifying better candidates for cryoablation.

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Acknowledgements

The authors thank Brian Wells, MD, PhD, from the Quantitative Health Sciences Department at the Cleveland Clinic for his help in the development of the nomogram.

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Correspondence to C Magi-Galluzzi.

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Competing interests

J. Stephen Jones is a consultant and advisory board member for Health Tronics. Mariana M. Padilha, Karen Streator Smith, Ming Zhou, Esteban Walker and Cristina Magi-Galluzzi declare no conflicts of interest.

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Padilha, M., Stephen Jones, J., Streator Smith, K. et al. Prediction of prostate cancer to urethra distance by a pretreatment nomogram: urethral thermoprotection implication in cryoablation. Prostate Cancer Prostatic Dis 16, 372–375 (2013). https://doi.org/10.1038/pcan.2013.32

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