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Cancer survival analysis focuses on quantifying and interpreting the time from a key starting point, such as diagnosis or the initiation of treatment, to a specific endpoint, such as remission or death. This analysis provides critical insights into treatment effectiveness and factors that influence patient outcomes, helping to shape clinical decisions and guide prognostic evaluations. A cornerstone of oncology research, survival analysis tackles the challenges of skewed, non-normally...
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Long-term Overall Survival after External Beam Radiotherapy for Localised Prostate Cancer.

M-C Jahreiβ1, L Incrocci1, M Dirkx1

  • 1Department of Radiotherapy, Erasmus MC Cancer Institute, University Medical Center Rotterdam, Rotterdam, The Netherlands.

Clinical Oncology (Royal College of Radiologists (Great Britain))
|October 18, 2023
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Summary

Prostate cancer (PCa) patients receiving external beam radiotherapy had lower survival with higher age, comorbidity, smoking, and Gleason score ≥8. Androgen deprivation therapy (ADT) improved survival in high-risk PCa patients.

Keywords:
External beam radiotherapyoverall survivalprognostic factorsprostate cancer

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Area of Science:

  • Oncology
  • Radiation Oncology
  • Prostate Cancer Research

Background:

  • Optimal treatment strategies for prostate cancer (PCa) depend on understanding survival probabilities.
  • External beam radiotherapy is a common treatment for localised PCa.

Purpose of the Study:

  • To investigate overall survival and prognostic factors in Dutch patients with localised PCa treated with external beam radiotherapy.
  • To identify factors influencing long-term outcomes in this patient cohort.

Main Methods:

  • Retrospective cohort study of 1536 PCa patients (T1-T3, aged 55-80) treated between 2006-2013.
  • Kaplan-Meier method for survival estimation; Cox regression for prognostic factor analysis.
  • Analysis included risk groups (low, intermediate, high) and treatment variables like androgen deprivation therapy (ADT).

Main Results:

  • Ten-year survival rates were 79.0% (low-risk), 59.9% (intermediate-risk), and 56.8% (high-risk).
  • Negative prognostic factors included higher age, comorbidity score, active smoking, and Gleason score ≥8.
  • ADT was associated with superior overall survival in the high-risk group.

Conclusions:

  • Comorbidity score and smoking habits are dominant predictors of overall survival in PCa patients undergoing radiotherapy.
  • ADT prescription improved survival in the high-risk group, making outcomes similar to the intermediate-risk group.
  • Gleason score ≥8 was associated with worse overall survival.