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The risk of mortality from multiple primary cancers in colorectal cancer survivors: analysis of data from the South Australian Cancer Registry

  • 0Flinders Health and Medical Research Institute, College of Medicine and Public Health, Flinders University, Adelaide, SA, 5042, Australia. gobe0011@flinders.edu.au.
Journal of Cancer Research and Clinical Oncology +

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July 27, 2025

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July 27, 2025

View abstract on PubMed

Summary

This summary is machine-generated.

Colorectal cancer (CRC) survivors with multiple primary cancers (MPCs) face a significantly higher risk of death. Early detection and management of these secondary cancers are crucial for improving survival outcomes in CRC patients.

Area Of Science

  • Oncology
  • Cancer Epidemiology
  • Public Health

Background

  • Colorectal cancer (CRC) survivors have an elevated risk of developing multiple primary cancers (MPCs).
  • Limited evidence exists regarding the mortality impact of MPCs in CRC survivors.

Purpose Of The Study

  • To investigate the mortality risk associated with multiple primary cancers (MPCs) in colorectal cancer (CRC) survivors.
  • To compare the survival of CRC survivors with MPCs to the general population and CRC survivors without MPCs.

Main Methods

  • Retrospective analysis of 26,093 CRC survivors from the South Australian Cancer Registry (1982-2017).
  • Defined MPCs as distinct primary cancers diagnosed ≥2 months after the initial CRC diagnosis.
  • Used Poisson regression and propensity score weighting to analyze cancer-specific and all-cause mortality, comparing CRC survivors with and without MPCs to the general population.

Main Results

  • CRC survivors had a 45% higher risk of dying from MPCs compared to the general population (SMR=1.45).
  • Gastrointestinal, lung, hematological, and urinary tract cancers were the most frequent causes of MPC-related death.
  • CRC survivors with MPCs experienced a 58% increase in all-cause mortality (HR=1.58).

Conclusions

  • Colorectal cancer survivors diagnosed with multiple primary cancers face significantly worse survival outcomes.
  • Prompt identification and effective management of secondary cancers are vital for enhancing the long-term survival of CRC patients.

Keywords:

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