A historical cohort study on glycemic-control and cancer-risk among patients with diabetes

R. Dankner, L. Keinan Boker, P. Boffetta, R. D. Balicer, H. Murad, A. Berlin, L. Olmer, N. Agai, L. S. Freedman

Research output: Contribution to journalArticlepeer-review

22 Scopus citations

Abstract

Aims: This population-based historical cohort study examined whether poor glycemic-control (i.e., high glucose and HbA1c blood levels) in patients with diabetes is associated with cancer-risk. Methods: From a large healthcare database, patients aged 21–89 years, diagnosed with diabetes before January 2002 (prevalent) or during 2002–2010 (incident), were followed for cancer during 2004–2012 (excluding cancers diagnosed within the first 2 years since diabetes diagnosis). Risks of selected cancers (all-sites, colon, breast, lung, prostate, pancreas and liver) were estimated according to glycemic-control in a Cox regression model with time-dependent covariates, adjusted for age, sex, ethnic origin, socioeconomic status, smoking and parity. Missing glucose or HbA1c values were imputed. Results: Among 440,000 patients included in our analysis, cancer was detected more than 2 years after diabetes diagnosis in 26,887 patients (6%) during the follow-up period. Associations of poor glycemic-control with all-sites cancer and most specific cancers were either null or only weak (hazard ratios (HRs) for a 1% HbA1c or a 30 mg/dl glucose increase between 0.94 and 1.09). Exceptions were pancreatic cancer, for which there was a strong positive association (HRs: 1.26–1.51), and prostate cancer, for which there was a moderate negative association (HRs: 0.85–0.96). Conclusion: Overall, poor glycemic-control appears to be only weakly associated with cancer-risk, if at all. A substantial part of the positive association with pancreatic cancer is attributable to reverse causation, with the cancer causing poorer glycemic-control prior to its diagnosis. The negative association with prostate cancer may be related to lower PSA levels in those with poor control.

Original languageEnglish
Pages (from-to)104-109
Number of pages6
JournalCancer Epidemiology
Volume57
DOIs
StatePublished - 1 Dec 2018

Keywords

  • Blood glucose control
  • Cancer
  • Cohort
  • Glycemic-control
  • HbA1c
  • Missing data
  • Multiple imputation
  • Risk

ASJC Scopus subject areas

  • Epidemiology
  • Oncology
  • Cancer Research

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