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Prognostic value of perineural invasion in prostate needle biopsies: a population-based study of patients treated by radical prostatectomy
  1. Peter Ström1,
  2. Tobias Nordström1,2,
  3. Brett Delahunt3,
  4. Hema Samaratunga4,
  5. Henrik Grönberg1,5,
  6. Lars Egevad6,
  7. Martin Eklund1
  1. 1 Medical Epidemiology and Biostatistics, Karolinska Institutet, Stockholm, Sweden
  2. 2 Department of Clinical Sciences, Danderyd University Hospital, Stockholm, Sweden
  3. 3 Pathology and Molecular Medicine, Wellington School of Medicine, Wellington, New Zealand
  4. 4 Aquesta Pathology, Brisbane, Queensland, Australia
  5. 5 Department of Oncology, S:t Göran Hospital, Stockholm, Sweden
  6. 6 Department of Oncology-Pathology, Karolinska Institutet, Stockholm, Sweden
  1. Correspondence to Dr Martin Eklund, Medical Epidemiology and Biostatistics, Karolinska Institutet, Stockholm 171 77, Sweden; martin.eklund{at}ki.se

Abstract

Aims Despite being one of the major pathways for the spread of malignant tumours, perineural invasion (PNI) has not conclusively been shown to have an independent prognostic value for prostate cancer. Prostatic biopsy constitutes the major pathology workload in prostate cancer and is the foundation for primary treatment decisions and for this reason we aimed to estimate the prognostic value of PNI in biopsies.

Methods We followed 918 men who underwent radical prostatectomy (RP) from the prospective and population based STHLM3 study until biochemical recurrence with a median follow-up of 4.1 years. To strengthen the evidence, we combined the estimates from the largest studies targeting the prognostic value of PNI in the biopsy. We also estimated the OR of advanced stage as radical prostatectomy for PNI positive and negative men.

Results The estimated prognostic value based on our data suggested an approximately 50% increased risk of biochemical recurrence if PNI was present in the biopsy (p=0.06). Even though not statistically significant on the 5% level, this estimate is consistent with similar studies, and by combining the estimates there is in fact strong evidence in support of an independent prognostic value of PNI in the biopsy (p<0.0001). There was also an independent increased risk of advanced stage at RP for positive men (OR 1.85, p=0.005).

Conclusions The evidence supporting a clinically relevant and independent prognostic value of PNI is strong enough to be considered for pathology reporting guidelines.

  • prostate
  • cancer
  • surgery
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This is an open access article distributed in accordance with the Creative Commons Attribution 4.0 Unported (CC BY 4.0) license, which permits others to copy, redistribute, remix, transform and build upon this work for any purpose, provided the original work is properly cited, a link to the licence is given, and indication of whether changes were made. See: https://creativecommons.org/licenses/by/4.0/.

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Footnotes

  • Handling editor Runjan Chetty.

  • Twitter @petstrsthlm

  • Contributors PS designed the study, performed the statistical analysis and drafted the manuscript. ME and HG collected data. ME supervised the study. LE assessed the biopsies, participated in the study design and participated in the drafting of the manuscript. BD and HS provided pathology expertise. TN provided urological expertise. All authors contributed in the interpretation of the study and critically reviewed the manuscript.

  • Funding The study was financed by Swedish Research Council, Swedish Cancer Society and Swedish Research Council for Health Working Life and Welfare (FORTE).

  • Competing interests None declared.

  • Patient consent for publication Not required.

  • Provenance and peer review Not commissioned; externally peer reviewed.

  • Data availability statement Data are available upon reasonable request. The complete code for this project is freely available at https://github.com/PeterStrom/PNI_clinical and data for reproducing the analyses are available upon request.

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