Palliative radiotherapy for bladder cancer: a systematic review and meta-analysis

Background/Purpose The optimal dose fractionation for palliative radiotherapy (RT) in patients with symptomatic advanced bladder cancer is unclear. This study aimed to determine if a higher dose of RT was associated with improved symptoms response rates. Methods We searched PubMed, Central and Embase for eligible studies published from 1990 to 2019. The primary outcomes were symptoms response rates for hematuria, dysuria and frequency. Secondary outcomes included treatment-related adverse events and quality of life. Results We found one randomized, four prospective and eight retrospective non-comparative observational studies including 1320 patients who received palliative bladder radiotherapy for symptom relief. The dose fractionation schedules varied across studies ranging from 8 Gy single fraction to 60 Gy in 2 to 8 Gy per fraction. The pooled response rates for hematuria, dyuria and frequency symptoms were 74%, 58% and 71% respectively. A higher dose of RT was not associated with improved response rates of hematuria and frequency. However, a higher dose of RT was associated with a longer duration of hematuria response and reduced response of dysuria. Grade 3 gastrointestinal and genitourinary toxicity occurred in up to 26% of patients. Health-related quality of life (HRQOL) outcomes were reported in one study. Conclusion This systematic review demonstrates that a higher dose of bladder RT was not associated with improved response rates of hematuria and frequency symptoms but was associated with reduced response of dysuria. Higher doses of bladder RT was associated with more durable hematuria response. Prospective studies to determine the effects of palliative bladder radiotherapy on HRQOL outcomes are warranted