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Is Inflammatory Bowel Disease an Important Risk Factor Among Older Persons with Colorectal Cancer in the United States? A Population-Based Case–Control Study

  • Aasma ShaukatEmail author
  • Daniel J. Virnig
  • Nadim I. Salfiti
  • David H. Howard
  • Shanthi V. Sitaraman
  • Jonathan M. Liff
Original Article

Abstract

Background

While ulcerative colitis (UC) and Crohn’s disease (CD) are thought to predispose to colorectal cancer (CRC), the association has not been well studied in an older population.

Aims

The objective of our study was to evaluate the association of ulcerative colitis and Crohn’s disease and colorectal cancer in a population-based, case–control study. We also wished to estimate the incidence rates of colorectal cancer among older individuals with UC/CD.

Methods

All cases of colorectal cancer in persons 67 and older in the SEER catchment area and in the Medicare claims database were compared with cancer-free controls residing in the same geographic area. We used multivariable logistic regression models adjusted for demographic and other factors.

Results

We identified 47,543 cases of CRC and 142,273 controls. We found a modest association between UC and CRC (OR 1.93; 95% CI 1.54–2.49; P-value < 0.001) and a significant, albeit modest, association between CD and CRC (OR 1.45; 95% CI 1.08–1.91; P-value 0.01). We found the incidence of CRC to be 8.2 per 10,000 person-years (95% CI 6.5–10.1/10,000 person-years) among those with UC/CD, and 6.1 per 10,000 person-years (95% CI 4.6–7.8/10,000 person-years) among those without UC/CD, resulting in an incidence rate ratio of 1.34.

Conclusions

Among older persons ulcerative colitis and Crohn’s disease are modest risk factors for CRC, and the incidence rate ratio for CRC is modest, suggesting that risk of CRC in patients with IBD may be lower than previously thought.

Keywords

Ulcerative colitis Colorectal cancer 

Notes

Conflict of interest

No conflicts of interest exist for any of the authors.

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Copyright information

© Springer Science+Business Media, LLC 2011

Authors and Affiliations

  • Aasma Shaukat
    • 1
    Email author
  • Daniel J. Virnig
    • 1
  • Nadim I. Salfiti
    • 1
  • David H. Howard
    • 2
  • Shanthi V. Sitaraman
    • 3
  • Jonathan M. Liff
    • 4
  1. 1.Section of Gastroenterology, Department of MedicineVA Medical Center and University of MinnesotaMinneapolisUSA
  2. 2.Department of Health, Policy & ManagementRollins School of Public Health, Emory UniversityAtlantaUSA
  3. 3.Division of Digestive Diseases, Department of MedicineEmory UniversityAtlantaUSA
  4. 4.Department of EpidemiologyRollins School of Public Health, Emory UniversityAtlantaUSA

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