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Secondary Primary Cancer Risk After Radiation Therapy in Rectal Cancer: A Population-Based Cohort Study With

Anne Schlesinger-Raab1, Gabriele Schubert-Fritschle1, Mia Kim2

  • 1Institute of Medical Information Processing, Biometry and Epidemiology (IBE), Faculty of Medicine, Ludwig-Maximilians-University Munich (LMU), Munich, Germany.

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This summary is machine-generated.

Radiation therapy (RT) in rectal cancer patients did not significantly increase secondary primary cancer (SC) risk overall. However, RT showed a protective effect against prostate cancer but a higher risk for bladder cancer in men.

Keywords:
Cancer epidemiologyCancer registryComparative effectiveness researchLong-term cancer survivalObservational study

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Area of Science:

  • Oncology
  • Radiation Oncology
  • Cancer Epidemiology

Background:

  • The impact of radiation therapy (RT) on secondary primary cancer (SC) development in rectal cancer (RC) patients remains unclear, particularly for cancers within the true pelvis.
  • Investigating this association is crucial for optimizing treatment strategies and patient outcomes in RC survivors.

Purpose of the Study:

  • To determine the incidence of SC in a population-based cohort of RC patients treated with or without RT.
  • To analyze the long-term risks of SC following surgical treatment for RC, stratified by RT exposure.

Main Methods:

  • A cohort of 13,919 RC patients (M0 stage) diagnosed between 1998-2019 was analyzed using cancer registry data.
  • Competing risk analyses were performed on 11,687 first malignancies, stratified by RT/NRT (no radiation therapy).
  • Propensity score matching was employed to control for confounding factors and create comparable RT and NRT groups.

Main Results:

  • The 20-year cumulative incidence of SC was similar between RT (16.5%) and NRT (17.4%) groups (P=0.2298).
  • Men receiving RT exhibited a reduced risk of developing prostate cancer (HR=0.55).
  • In the propensity score-matched cohort, RT was associated with a higher risk of bladder cancer (10-year incidence 1.1% vs. 0.6% in NRT).

Conclusions:

  • Radiation therapy (RT) for rectal cancer (RC) does not appear to increase the overall risk of secondary primary cancer (SC).
  • A protective effect of RT against prostate cancer development was observed, but a potential increased risk for bladder cancer warrants further investigation.
  • Future research should focus on sex-specific analyses and contemporary data to better understand long-term SC risks associated with RT in RC patients.