Genitourinary toxicity after pelvic radiation: Prospective review of complex urological presentations.

Objective: Recent randomised controlled trials underestimated the incidence of genitourinary (GU) complications occurring more than 5 years following pelvic radiotherapy. This study aimed to determine the burden of treatment at a single institution from late GU complications after pelvic radiotherapy.

Methods: A prospective study of all presentations for GU complications following pelvic radiotherapy at a tertiary urology department between November 2018 and November 2019 was performed. Subgroup analyses was performed on patients with prostate cancer (PCa) with late toxicity to compare patient demographics, radiotherapy, complications, and management factors.

Results: There were 117 hospital encounters involving 46 patients with a 56.4% repeat encounter rate Patients with PCa were the predominant group (=39, 84.8%). External beam radiotherapy was the most common treatment modality (=41, 89.1%). The median time from radiotherapy to encounter was 8 (range 0-23) years. Radiation-induced haemorrhagic cystitis was the most common presentation (=70, 59.8%). Forty-four (42.7%) encounters for GU toxicity were managed operatively and 33 (32.0%) involved a non-operative procedure. Nine patients required packed red cell transfusion, with a total of 154 units transfused Patients with PCa who presented with late GU toxicity had higher median Radiotherapy Oncology Group grades (=0.020), proportion of emergency admissions (=0.047), and frequency of clot urinary retention (<0.001).

Conclusion: There is a high burden of elective and emergency urology workload attributed to late pelvic radiation toxicity. Late GU toxicity occurring ≥5 years after radiotherapy is common and often more severe.