Cumulative incidence and predictive factors of radiation cystitis in patients with localized prostate cancer

To determine the cumulative incidence of overall and severe radiation cystitis in a high volume cohort of patients and to investigate its potential predictive factors.

We have performed a retrospective analysis of clinical data from patients diagnosed with localized prostate cancer and treated with radiotherapy at our institution (June 2005-January 2013), and quantified the cumulative incidence of radiation cystitis. Cox regression analysis and Kaplan-Meier curves were computed to evaluate the determinants of radiation cystitis.

Data from 783 patients was retrieved (557 treated with primary radiotherapy, 188 with adjuvant and 38 with salvage). Median follow-up time was 49 months (P25-P75: 31.8-69.3). At 5 years of follow-up, cumulative incidence of overall and severe radiation cystitis was 9.1 and 1.6%, respectively. No association was found between the incidence of radiation cystitis and age, tumor T stage, baseline PSA level, Gleason score, D'Amico risk classification, radiotherapy setting (primary versus adjuvant versus salvage) or radiation dose applied.

Within our cohort, radiation cystitis is an uncommon complication of prostatic radiotherapy treatment, and severe cases requiring hospitalization are even more infrequent. We found no association between tumor characteristics, radiotherapy setting or radiation dose and the cumulative incidence of radiation cystitis.

Actas urologicas espanolas. 2017 Nov 20 [Epub ahead of print]

D Afonso-João, L Pacheco-Figueiredo, T Antunes-Lopes, L A Morgado, V Azevedo, L Vendeira, J Silva, C Martins-Silva

Faculty of Medicine of Porto University, Centro Hospitalar São João, Porto, Portugal. Electronic address: ., Life and Health Sciences Research Institute, School of Health Sciences, University of Minho, Braga, Portugal; Department of Urology, Centro Hospitalar São João, Porto, Portugal., Faculty of Medicine of Porto University, Centro Hospitalar São João, Porto, Portugal; Department of Urology, Centro Hospitalar São João, Porto, Portugal., Faculty of Medicine of Porto University, Centro Hospitalar São João, Porto, Portugal; Department of Radiation Oncology, Centro Hospitalar São João, Porto, Portugal., Faculty of Medicine of Porto University, Centro Hospitalar São João, Porto, Portugal; Department of Urology, Centro Hospitalar São João, Porto, Portugal; i3S, Instituto de Investigação e Inovação em Saúde, Porto University, Porto, Portugal.

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