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  • Title: Evaluation of Risk of Bullous Pemphigoid With Initiation of Dipeptidyl Peptidase-4 Inhibitor vs Second-generation Sulfonylurea.
    Author: Lee H, Chung HJ, Pawar A, Patorno E, Kim DH.
    Journal: JAMA Dermatol; 2020 Oct 01; 156(10):1107-1114. PubMed ID: 32697283.
    Abstract:
    IMPORTANCE: Despite several recent reports on the elevated risk of bullous pemphigoid in patients with type 2 diabetes treated with dipeptidyl peptidase-4 (DPP-4) inhibitors, evidence on the absolute risk and comparative safety against other antidiabetics is limited. OBJECTIVE: To characterize the incidence rate of bullous pemphigoid associated with DPP-4 inhibitor use compared with second-generation sulfonylureas. DESIGN, SETTING, AND PARTICIPANTS: This cohort study used data from 2 large commercial insurance claims databases (Optum Clinformatics Data Mart from October 17, 2006, to December 31, 2018, and IBM MarketScan Research Database from October 17, 2006, to December 31, 2017) and Medicare data from January 1, 2006, to December 31, 2016. Patients with type 2 diabetes who initiated treatment with DPP-4 inhibitors or second-generation sulfonylurea were included. MAIN OUTCOMES AND MEASURES: The primary outcome of the study was bullous pemphigoid, identified using diagnosis codes. After 1:1 propensity score matching, the incidence rates of bullous pemphigoid and the hazard ratios (HRs) with 95% CIs comparing patients who initiated DPP-4 inhibitor and second-generation sulfonylurea therapy were estimated. Subgroup analyses by age, sex, race, and individual DPP-4 agents were performed. The results from each database were pooled using inverse-variance fixed-effects meta-analysis. RESULTS: A total of 1 664 880 patients who initiated DPP-4 inhibitors (51.0% female; mean [SD] age, 63.9 [9.7] years) and sulfonylurea (50.4% female; mean [SD] age, 63.9 [9.9] years) were included. The incidence rate of bullous pemphigoid per 1000 person-years was 0.42 in the DPP-4 inhibitor group vs 0.31 in the sulfonylurea group (HR, 1.42; 95% CI, 1.17-1.72). Higher rates per 1000 person-years for DPP-4 inhibitor vs sulfonylurea groups were seen in those who were 65 years or older (0.79 vs 0.49; HR, 1.62; 95% CI, 1.32-1.99), white (0.93 vs 0.54; HR, 1.70; 95% CI, 1.30-2.24), and treated with linagliptin (1.20 vs 0.55; HR, 1.68; 95% CI, 1.16-2.43). CONCLUSIONS AND RELEVANCE: This study found that patients who initiated DPP-4 inhibitor therapy had higher risk of bullous pemphigoid than those who initiated second-generation sulfonylurea therapy. Clinicians should be aware of this rare adverse effect of DPP-4 inhibitors in subgroups of patients who are older, white, and linagliptin users.
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