Diabetes, use of antidiabetic drugs, and the risk of glioma

Seliger, Corinna; Ricci, Cristian; Meier, Christoph R; Bodmer, Michael; Jick, Susan S; Bogdahn, Ulrich; Hau, Peter; Leitzmann, Michael F (2015). Diabetes, use of antidiabetic drugs, and the risk of glioma. Neuro-Oncology, 18(3), pp. 340-349. Oxford University Press 10.1093/neuonc/nov100

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BACKGROUND

Prior epidemiologic studies suggest inverse relations between diabetes and glioma risk, but the underlying mechanisms, including use of antidiabetic drugs, are unknown.

METHODS

We therefore performed a matched case-control analysis using the Clinical Practice Research Datalink (CPRD). We identified incident glioma cases diagnosed between 1995 and 2012 and matched each case with 10 controls on age, gender, calendar time, general practice, and years of active history in the CPRD. We performed conditional logistic regression to estimate odds ratios (ORs) with 95% CIs, adjusted for body mass index and smoking.

RESULTS

We identified 2005 cases and 20 050 controls. Diabetes was associated with decreased risk of glioma (OR = 0.74; 95% CI = 0.60-0.93), particularly glioblastoma (OR = 0.69; 95% CI = 0.51-0.94). Glioblastoma risk reduction was markedly pronounced among diabetic men (OR = 0.60; 95% CI = 0.40-0.90), most apparently for those with diabetes of long-term duration (OR for >5 vs 0 y = 0.46; 95% CI = 0.26-0.82) or poor glycemic control (OR for HbA1c ≥8 vs <6.5% = 0.20; 95% CI = 0.06-0.70). In contrast, the effect of diabetes on glioblastoma risk was absent among women (OR = 0.85; 95% CI = 0.53-1.36). No significant associations with glioma were found for use of metformin (OR for ≥30 vs 0 prescriptions = 0.72; 95% CI = 0.38-1.39), sulfonylureas (OR = 0.71; 95% CI = 0.39-1.30), or insulin (OR = 0.79; 95% CI = 0.37-1.69).

CONCLUSIONS

Antidiabetic treatment appears to be unrelated to glioma, but long-term diabetes duration and increased HbA1c both show decreased glioma risk. Stronger findings in men than women suggest low androgen levels concurrent with diabetes as a biologic mechanism.

Item Type:	Journal Article (Original Article)
Division/Institute:	04 Faculty of Medicine > Department of General Internal Medicine (DAIM) > Clinic of General Internal Medicine > Centre of Competence for General Internal Medicine
UniBE Contributor:	Bodmer, Michael
ISSN:	1523-5866
Publisher:	Oxford University Press
Language:	English
Submitter:	Jacques Donzé
Date Deposited:	23 Mar 2016 12:01
Last Modified:	05 Dec 2022 14:52
Publisher DOI:	10.1093/neuonc/nov100
PubMed ID:	26093337
Uncontrolled Keywords:	diabetes; epidemiology; glioma; metformin; testosterone
URI:	https://boris.unibe.ch/id/eprint/77313