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International Journal of Colorectal Disease

, Volume 34, Issue 8, pp 1467–1475 | Cite as

Role of pre-existing type 2 diabetes in colorectal cancer survival among older Americans: a SEER-Medicare population-based study 2002–2011

  • Sanae El brahimiEmail author
  • Matthew Lee Smith
  • Paulo S. Pinheiro
Original Article

Abstract

Purpose

Type 2 diabetes mellitus (diabetes) is a common comorbid condition among older adult colorectal cancer (CRC) patients, yet its effects on CRC mortality have not been adequately examined. This study aims to investigate the association between pre-existing diabetes, with and without complications, and CRC mortality.

Methods

Medicare beneficiaries 67 years and older diagnosed with CRC between 2002 and 2011 were studied using the Surveillance, Epidemiology, and End Results (SEER)-Medicare datasets. Pre-existing diabetes was ascertained using validated algorithms. Cox proportional hazards models were used to compare all-cause and CRC-cause-specific death risk differences in relation to prior diabetes diagnosis and diabetes severity (with and without complications) with adjustment for relevant patient demographics and disease characteristics.

Results

Analyses included 93,710 CRC patients. Among the study population, 22,155 (24%) had diabetes prior to CRC diagnosis and 4% had diabetes-related complications (neuropathy, nephropathy, retinopathy, or peripheral circulatory disorders). All-cause CRC mortality was significantly higher among diabetic patients compared with non-diabetic patients (hazard ratio (HR) = 1.20; 95% confidence interval (CI) = 1.17–1.23). The results were more pronounced for diabetes with complications (HR = 1.47; 95% CI = 1.34–1.54). Diabetic patients with complications were 16% more likely to die of colorectal cancer compared with patients without diabetes (HR = 1.16; 95% CI = 1.08–1.25).

Conclusion

Pre-existing diabetes contributes to poorer all-cause mortality among CRC patients and increased mortality from CRC among those with diabetes and complications. Opportunities exist to incorporate diabetes prevention and management interventions during CRC treatment phases among older adults.

Keywords

Cancer Colorectal cancer Type 2 diabetes Survival Medicare Mortality 

Notes

Acknowledgments

We thank Sani H. Kizilbash, MBBS, MPH for his counseling on data methods and statistical programs.

Funding

This work was partially supported by Exito!- the National Cancer Institute (grant no. 1R25CA134301-01A2).

Compliance with ethical standards

Human and animal rights and informed consent

The study did not involve research on human subjects and it did not require informed consent.

Conflict of interest

The authors declare that they have no conflict of interest.

Disclaimer

The funding source had no involvement in study design; in the collection, analysis, and interpretation of data; in the writing of the report; and in the decision to submit the article for publication.

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  1. 1.Department of Epidemiology and Biostatistics, School of Public HealthUniversity of Nevada, Las VegasLas VegasUSA
  2. 2.Center for Population Health and AgingTexas A&M UniversityCollege StationUSA
  3. 3.Department of Health Promotion and Behavior, College of Public HealthThe University of GeorgiaAthensUSA
  4. 4.Department of Public Health Sciences, Sylvester Comprehensive Cancer CenterUniversity of Miami Miller School of MedicineMiamiUSA

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