Prevalence of contralateral testicular intraepithelial neoplasia in patients with testicular germ cell neoplasms

Journal of Clinical Oncology : Official Journal of the American Society of Clinical Oncology
K P Dieckmann, Volker Loy

Abstract

Testicular intraepithelial neoplasia ([TIN], so-called carcinoma in situ of the testis) is hypothesized to be the precursor of testicular germ cell neoplasms. According to previous studies, it can be detected by testicular biopsy. Since patients with a unilateral testicular tumor are at high risk of a second testicular tumor, it seemed feasible to examine the prevalence of contralateral TIN in patients with testicular germ cell cancer and correlate it with the known prevalence of bilateral testicular tumors. The aim was to provide more evidence for the role of TIN as the preinvasive stage of testicular cancer. Nineteen hundred fifty-four consecutive patients with a unilateral testicular germ cell tumor underwent contralateral biopsy. All specimens were examined immunohistologically. TIN was observed in 4.9% (95% confidence interval [CI], 3.95% to 5.91%). Testicular atrophy and a history of undescended testis were more frequently observed in patients with contralateral TIN, but only atrophy was shown to be independently associated by multivariate analysis. Patients with testicular atrophy have a 4.3-fold increased risk of having contralateral TIN. Sixty-four percent of TIN cases were found in normal testes. Patients with TIN wer...Continue Reading

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