Cancer Causes & Control

, Volume 22, Issue 2, pp 189–197 | Cite as

Diabetes and risk of pancreatic cancer: a pooled analysis of three large case–control studies

  • Donghui Li
  • Hongwei Tang
  • Manal M. Hassan
  • Elizabeth A. Holly
  • Paige M. Bracci
  • Debra T. Silverman
Original paper

Abstract

Racial differences in diabetes-associated pancreatic cancer (PC) and the interaction of diabetes with other risk factors are not well established. We determined the association between diabetes and risk of PC in 2,192 cases and 5,113 controls in three large case–control studies conducted at the National Cancer Institute, the University of California San Francisco, and the M.D. Anderson Cancer Center. In multivariable analyses, diabetes was associated with a 1.8-fold risk of PC [95% confidence interval (CI) = 1.5–2.1]. Risk estimates decreased with increasing years with diabetes (≤2 years OR = 2.9, 95% CI = 2.1–3.9; 3–5 years OR = 1.9, 95% CI = 1.3–2.6; 6–10 years OR = 1.6, 95% CI = 1.2–2.3; 11–15 years OR = 1.3, 95% CI = 0.9–2.0; > 15 years OR = 1.4, 95% CI = 1.0–2.0 (p for trend < 0.0001). Among diabetics, risk was higher in insulin ever users compared with nonusers (OR = 2.2, 95% CI = 1.6–3.7) and was restricted to insulin use of ≤3 years (OR = 2.4). Insulin use of >10 years was associated with a reduced risk of pancreatic cancer (OR = 0.5, 95% CI = 0.3–0.9; p for trend < 0.0001). Hispanic men and Asians had a higher risk of diabetes-associated PC than did whites and blacks, but the differences were not statistically significant. No significant interaction between diabetes and cigarette smoking, alcohol consumption and body mass index was observed. Although reverse causation may explain the association between diabetes diagnosed in close temporal proximity to PC, our results show that long-term diabetes, even though risk diminishes over time, remains a risk factor for PC independent of obesity and smoking.

Keywords

Diabetes Pancreatic cancer Case–control study Epidemiology 

Abbreviations

AOR

Adjusted odds ratio

BMI

Body mass index

CI

Confidence interval

HCFA

Health Care Finance Administration

MDACC

The University of Texas M.D. Anderson Cancer Center

NCI

National Cancer Institute

OR

Odds ratio

PC

Pancreatic cancer

SFBA

The University of California San Francisco Bay Area

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Copyright information

© Springer Science+Business Media B.V. 2010

Authors and Affiliations

  • Donghui Li
    • 1
  • Hongwei Tang
    • 1
  • Manal M. Hassan
    • 1
  • Elizabeth A. Holly
    • 2
  • Paige M. Bracci
    • 2
  • Debra T. Silverman
    • 3
  1. 1.Department of Gastrointestinal Medical OncologyThe University of Texas M. D. Anderson Cancer CenterHoustonUSA
  2. 2.Department of Epidemiology and Biostatistics, School of MedicineUniversity of California San FranciscoSan FranciscoUSA
  3. 3.Division of Cancer Epidemiology and GeneticsNational Cancer InstituteBethesdaUSA

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