Abstract
Background
Patients following solid organ transplantation have an increased risk of developing de novo bladder tumors, but their biology is poorly characterized.
Methods
We studied 1743 patients who underwent a transurethral resection of a newly diagnosed bladder tumor at a single institution. The histopathology, treatment, recurrence-free survival and overall survival were evaluated and compared between transplant and non-transplant patients.
Results
We identified 74 transplant patients who developed a de novo bladder tumor after a median post-transplantation interval of 62 months. The tumor was malignant in 29 patients (39 %). The most common benign lesion was nephrogenic adenoma (84 %), which neither coexisted with nor developed into malignant tumors during follow-up. Compared with non-transplant patients (n = 1669), transplant patients were significantly younger (median 55 vs 69 years, P < 0.001) and had a 9.0-fold higher odds of benign tumors (P < 0.001), while there were no differences in pathology among patients with urothelial carcinoma of the bladder (UCB). In a multivariable analysis for non-muscle-invasive UCB that was adjusted for the risk group, patients with a transplant had a 1.8-fold increased risk of recurrence (P = 0.048). Four of five transplant patients did not respond to Bacillus Calmette–Guérin instillations. There were no differences in overall survival after radical cystectomy (P = 0.87).
Conclusions
The majority of bladder tumors in transplant patients are benign, and they neither coexist with nor develop into malignant tumors. Transplant patients with non-muscle-invasive UCB show an increased risk of disease recurrence, while those treated with radical cystectomy have similar outcomes to patients without a transplant.
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Acknowledgments
IL was supported by the development fund of the CHUV University Hospital and the European Urological Scholarship Program. TK was supported by the Oesterreichische Nationalbank Anniversary Fund (Project number: 15363/2013) and the Medical Scientific Fund of the Mayor of the City of Vienna (Project number: 14069/2014).
Conflict of interest
The authors declare no conflict of interest.
Ethical standard
This study was approved by the ethical committee of the Medical University of Vienna (Protocol registration number: 1334/2014).
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Ines A. Ederer and Ilaria Lucca have contributed equally as co-first authors and are in alphabetical order.
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Ederer, I.A., Lucca, I., Hofbauer, S.L. et al. Histopathology and prognosis of de novo bladder tumors following solid organ transplantation. World J Urol 33, 2087–2093 (2015). https://doi.org/10.1007/s00345-015-1554-z
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DOI: https://doi.org/10.1007/s00345-015-1554-z