Abstract:
OBJECTIVE:Several meta-analyses of observational studies suggested that metformin use reduces cancer risk in type 2 diabetes. However, this result was not confirmed by the few available randomized controlled trials (RCTs), and many observational studies on metformin and cancer were potentially afflicted with time-related bias. We aimed to avoid this bias when comparing cancer incidence in users of sulfonylurea, insulin, and other diabetes medications, respectively, with cancer incidence in metformin users. RESEARCH DESIGN AND METHODS:In a retrospective observational study, we used the German Disease Analyzer database with patient data from general practices throughout Germany. The study sample included 22,556 patients diagnosed with type 2 diabetes. During the median follow-up time of 4.8 years, 1,446 (6.4%) patients developed any cancer. In Cox regression analyses with either monotherapies or first diabetes medications as drug exposure, users of sulfonylurea (or insulin or other antidiabetes medications) were compared with metformin users. RESULTS:In multivariable adjusted models, hazard ratios were 1.09 (95% CI 0.87-1.36) for sulfonylurea monotherapy, 1.14 (95% CI 0.85-1.55) for insulin monotherapy, and 0.94 (95% CI 0.67-1.33) for other diabetes medications compared with metformin monotherapy. Results were similar for comparison of first diabetes medications. CONCLUSIONS:In a retrospective database analysis, taking into account potential time-related biases, no reduced cancer risk was found in metformin users. To clarify the association between diabetes medication and cancer risk, further well-designed observational studies and RCTs are needed.
journal_name
Diabetes Carejournal_title
Diabetes careauthors
Kowall B,Rathmann W,Kostev Kdoi
10.2337/dc14-0977subject
Has Abstractpub_date
2015-01-01 00:00:00pages
59-65issue
1eissn
0149-5992issn
1935-5548pii
dc14-0977journal_volume
38pub_type
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