Eur J Pediatr Surg
DOI: 10.1055/s-0037-1605350
Original Article
Georg Thieme Verlag KG Stuttgart · New York

Postnatal Germ Cell Development in the Cryptorchid Testis: The Key to Explain Why Early Surgery Decreases the Risk of Malignancy

Jorgen Thorup1, 2, Erik Clasen-Linde3, Ruili Li4, 5, Susanne Reinhardt1, Kolja Kvist1, Jaya Vikraman4, Bridget R. Southwell4, 5, John M. Hutson4, 5, 6, Dina Cortes2, 7
  • 1Department of Pediatric Surgery, Rigshospitalet, Copenhagen, Denmark
  • 2Institute for Clinical Medicine, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark
  • 3Department of Pathology, Rigshospitalet, Copenhagen, Denmark
  • 4Douglas Stephens Surgical Research Laboratory, Murdoch Children's Research Institute, Melbourne, Australia
  • 5Department of Paediatrics, University of Melbourne, Melbourne, Australia
  • 6Department of Paediatric Urology, Royal Children's Hospital, Melbourne, Australia
  • 7Section of Endocrinology, Department of Pediatrics, Copenhagen University Hospital Hvidovre, Hvidovre, Denmark
Further Information

Publication History

12 May 2017

04 July 2017

Publication Date:
24 August 2017 (eFirst)

Abstract

Purpose Cryptorchidism is a risk factor for testicular malignancy and surgical treatment lowers this risk. This study aimed to investigate the germ cell behavior in prepubertal cryptorchid testes using immunohistochemical markers for germ cell malignancy to understand how early orchiopexy may possibly prevent cancer developing.

Materials and Methods Histology sections from 1,521 consecutive testicular biopsies from 1,134 boys aged 1 month to 16.5 years operated for cryptorchidism were incubated with antibodies including antiplacental-like alkaline phosphatase (PLAP), anti-Oct3/4, anti-C-kit, and anti-D2–40.

Results Oct3/4 and D2–40-positive germ cells are found throughout the first 2 years of life, with declining frequency thereafter. After 2 years, they should have disappeared and may indicate neoplasia. PLAP-positive cells were seen in 57 to 82% and C-kit-positive cells in 5 to 21% of cryptorchid testes between 4 and 13 years. Not until puberty did PLAP and C-kit-positive undifferentiated spermatogonial stem cells vanish. Only 0.3% of the present material had obvious prepubertal intratubular germ cell neoplasia (ITGCN) and they all had syndromic cryptorchidism. An additional three boys (0.3%) older than 2 years had weak Oct3/4 expression in undescended testes, but all cases were D2–40 negative.

Conclusion Prepubertal ITGCN was rare and mostly seen in syndromic cryptorchidism. In nonsyndromic cryptorchidism PLAP-positive undifferentiated spermatogonial stem cells persisted in a significant proportion of nontreated undescended testes and they will be especially sensitive to long-lasting abnormally high temperature that may be the single most important cause facilitating the accumulation of mutations during cell replication and the development of ITGCN to be prevented by orchiopexy.

Note

This study was conducted according to the Helsinki II declaration, and informed consent was obtained from the parents of the patients. This study was approved by Ethics Committee of Copenhagen, original file number KF-01299830.