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  • Title: Dipeptidyl-peptidase-4 inhibitors and pancreatic cancer: a cohort study.
    Author: Gokhale M, Buse JB, Gray CL, Pate V, Marquis MA, Stürmer T.
    Journal: Diabetes Obes Metab; 2014 Dec; 16(12):1247-56. PubMed ID: 25109825.
    Abstract:
    AIM: To compare pancreatic cancer incidence and diagnostic evaluation among patients initiating dipeptidyl-peptidase-4 (DPP-4) inhibitor treatment with those initiating sulfonylureas (SU) and thiazolidinediones (TZD). METHODS: Medicare claims data were examined in a new-user active-comparator cohort study. Patients >65 years with no prescriptions for DPP-4 inhibitors, SU or TZD at baseline were included if they had at least two claims for the same drug within 180 days. Using an as-treated approach and propensity score-adjusted Cox models, we estimated the hazard ratios (HRs) and 95% confidence intervals (CIs) for pancreatic cancer. Diagnostic evaluations were compared using risk ratios. RESULTS: In the DPP-4 inhibitor versus SU comparison, there were 18 179 patients who initiated treatment with DPP-4 inhibitors, of whom 26 developed pancreatic cancer (interquartile range follow-up 5-18 months). In the DPP-4 inhibitor versus TZD comparison there were 29 366 people initiating DPP-4 inhibitor treatment and 52 of these developed pancreatic cancer. The risk of pancreatic cancer with DPP-4 inhibitor treatment was lower relative to SU treatment (HR: 0.6, CI: 0.4-0.9) and similar to TZD treatment (HR: 1.0, 95% CI: 0.7-1.4). After the first 6 months of follow-up were excluded to reduce the potential for reverse causality, the results were not altered. The probability of diagnostic evaluation after commencing DPP-4 inhibitor treatment (79.3%) was similar to that for TZD (74.1%, risk ratio 1.06, 95% CI: 1.05-1.07) and SU (74.6%) (risk ratio 1.06, 95% CI: 1.05-1.07). The probability of diagnostic evaluation before the index date (date of initiating treatment) was ∼80% for all cohorts. CONCLUSION: Although the present study was limited by sample size and the observed duration of treatment in the USA, our well-controlled population-based study suggests there is no higher short-term pancreatic cancer risk with DPP-4 inhibitor treatment relative to SU or TZD treatment.
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