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Published on: March 6, 2018
Competing-risks mortality after radiotherapy vs. observation for localized prostate cancer: a population-based study
Firas Abdollah1, Maxine Sun, Jan Schmitges
1Cancer Prognostics and Health Outcomes Unit, University of Montreal Health Centre, Montreal, Canada. firas.abdollah@gmail.com
International Journal of Radiation Oncology, Biology, Physics
|February 15, 2012
Summary
Radiotherapy significantly improves cancer-specific survival for high-risk prostate cancer patients. For low-to-intermediate risk prostate cancer, radiotherapy offers minimal to no survival benefit compared to observation.
Area of Science:
- Oncology
- Urology
- Radiotherapy
Background:
- Localized prostate cancer (PCa) management increasingly involves radiotherapy.
- Limited data exist on radiotherapy's impact on cancer-specific mortality (CSM) in PCa.
Purpose of the Study:
- To evaluate the association between radiotherapy and survival in localized PCa patients.
- To compare radiotherapy outcomes with observation in localized PCa.
Main Methods:
- A population-based cohort of 68,797 men with cT1-T2 PCa treated between 1992-2005 was analyzed.
- Propensity-score matching was employed to mitigate treatment assignment bias.
- Competing-risks analyses assessed the effect of radiotherapy versus observation on CSM, adjusting for other-cause mortality.
Main Results:
- Radiotherapy showed improved 10-year CSM rates in high-risk PCa (8.8% vs. 14.4%).
- No significant benefit in CSM was observed for low-intermediate risk PCa patients treated with radiotherapy (3.7% vs. 4.1%).
- Radiotherapy demonstrated benefits across various comorbidity statuses and in elderly patients.
Conclusions:
- Radiotherapy substantially improves CSM in high-risk localized prostate cancer.
- The benefit of radiotherapy for low- to intermediate-risk PCa is minimal or absent compared to observation.
- Findings should be considered within the limitations of observational study data.
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