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Editorial
Others Dipeptidyl Peptidase-4 Inhibitor Alarms: Is Heart Failure Caused by a Class Effect?
Yong-ho Lee
Diabetes & Metabolism Journal 2015;39(3):204-206.
DOI: https://doi.org/10.4093/dmj.2015.39.3.204
Published online: June 15, 2015
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Division of Endocrinology and Metabolism, Department of Internal Medicine, Severance Hospital, Yonsei University College of Medicine, Seoul, Korea.

corresp_icon Corresponding author: Yong-ho Lee. Division of Endocrinology and Metabolism, Department of Internal Medicine, Severance Hospital, Yonsei University College of Medicine, 50-1 Yonsei-ro, Seodaemun-gu, Seoul 120-752, Korea. yholee@yuhs.ac

Copyright © 2015 Korean Diabetes Association

This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Since the rosiglitazone controversy aroused in 2007 [1], US Food and Drug Administration and most other regulatory agencies have requested to perform cardiovascular safety assessments for upcoming antidiabetic medications [2]. Dipeptidyl peptidase-4 (DPP4) inhibitors belong to a new class of oral antidiabetic drugs which can ameliorate hyperglycemia by increasing endogenous concentration of glucagon-like peptide-1, a gut-derived hormone that stimulates insulin secretion and delays gastric emptying. However, despite its popularity in the diabetes market, the cardiovascular safety of DPP4 inhibitors has not been investigated following the two large, randomized, placebo-controlled trials (RCTs), saxagliptin assessment of vascular outcomes recorded in patients with diabetes mellitus-thrombolysis in myocardial infarction (SAVOR-TIMI 53) [3] with saxagliptin and Examination of Cardiovascular Outcomes with Alogliptin vs. Standard of Care (EXAMINE) [4] with alogliptin, which recently published the results of cardiovascular outcomes in 2013.
Unexpectedly, SAVOR-TIMI 53 showed that the rate of hospital admission for heart failure was significantly increased by 27% in subjects treated with saxagliptin, while EXAMINE did not report any outcome related to heart failure. A subsequent paper based on EXAMINE trial reported that alogliptin was not associated with the increased risk of heart failure outcomes, such as hospital admission for heart failure, compared with placebo group [5]. However, both studies observed that hospital admission for heart failure occurred more frequently in subjects treated with saxagliptin or alogliptin who had no history of this disease condition (SAVOR-TIMI 53: hazard ratio [HR], 1.30, 95% confidence interval [CI], 1.03 to 1.65; EXAMINE: HR, 1.76, 95% CI, 1.07 to 2.90). According to the additional report from SAVOR-TIMI 53, the high-risk patients for heart failure hospitalization were those who had a prior history of heart failure, elevated baseline levels of N-terminal pro-brain natriuretic peptide, or chronic kidney disease [6].
To date, several studies demonstrated conflicting results regarding the safety of DPP4 inhibitors on heart failure. A nested case-control study based on a large insurance claimed that the database from United States showed that sitagliptin was associated with heart failure admissions in patients recently diagnosed with heart failure (adjusted odds ratio [OR], 1.84; 95% CI, 1.16 to 2.92; P=0.01) [7]. A propensity-matched analysis using Taiwan National Health Insurance research database with a total of 16,576 subjects reported that sitagliptin users were hospitalized for heart failure more frequently than patients that were never exposed to a DPP4 inhibitor (HR, 1.21; 95% CI, 1.04 to 1.42; P=0.017) [8]. In this study, patients with the highest adherence to sitagliptin had the greatest risk of developing heart failure (HR, 2.56; 95% CI, 2.10 to 3.12) compared with never users. In addition, similar findings were derived from a recent meta-analysis of 82 randomized controlled clinical trials with various DPP4 inhibitors treated for at least 24 weeks. The overall risk of acute heart failure was significantly elevated in the DPP4 inhibitor group compared with placebo/active comparators (n=69,615; Mantel-Haenszel OR, 1.19; 95% CI, 1.03 to 1.37; P=0.015) [9]. In Vildagliptin in Ventricular Dysfunction Diabetes (VIVIDD) trial, 254 subjects with type 2 diabetes and New York Heart Association functional classes I through III heart failure were randomized to vildagliptin or placebo for 12 months [10]. Although there was no difference in left ventricular ejection fraction between two groups, patients treated with vildagliptin had an increase in left ventricular end-diastolic volumes, suggesting that vildagliptin could possibly increase the risk of heart failure.
However, a recent population-based study from United Kingdom showed that incretin-based drugs were not associated with an increased risk of heart failure among patients with type 2 diabetes (OR, 0.85; 95% CI, 0.62 to 1.16) [11]. Although five drugs (sitagliptin, vildagliptin, saxagliptin, exenatide, and liraglutide) were included in the analysis, majority of patients were prescribed sitagliptin. A non-randomized, observational real-world study from Germany (DiaRegis registry) enrolled patients with prior metformin monotherapy who then received either DPP4 inhibitors or sulfonylurea [12]. Similarly, there was no difference in event rates of heart failure between two groups (1.7% in the DPP4 inhibitor group vs. 2.0% in the sulfonylurea group, P=0.85), while subjects with DPP4 inhibitors showed significantly lower rates of stroke and transitory ischemic attack.
In this issue of Diabetes and Metabolism Journal, Seo et al. [13] provided additional concerns about the safety of DPP4 inhibitors on heart failure in Korean type 2 diabetes. Based on Korean Health Insurance claims database, they used pioglitazone as a positive control for increasing risk of heart failure [14] and compared the incidence rate of hospital admission for heart failure with DPP4 inhibitors. Compared with pioglitazone group, sitagliptin and vildagliptin users did not show any significant difference in hospitalization rate for heart failure, indicating the comparable effects on the development of heart failure between DPP4 inhibitors and pioglitazone. Despite the large number of subjects, the potential for confounding in this study cannot be ruled out because of the limitation of the nature of claim database. Furthermore, there is no information regarding compliance of medications and comorbidities in the study population which should be adjusted in the analysis. Regardless of drug types, the hospitalization rate for heart failure was greatest in the first 30 days after starting to take the medication, when compared with days 31 to 360 days. Similar to their findings, Scirica et al. [6] reported that the risk of heart failure hospitalization was most pronounced in the first 12 months of treatment with saxagliptin. These two findings suggest that DPP4 inhibitors may trigger heart failure in vulnerable but unidentified or subclinical subjects who are likely to develop heart failure. On the contrary to thiazolidinediones, DPP4 inhibitors are not associated with edema or fluid retention, therefore the mechanism for heart failure might be different, which should be elucidated by further research.
In summary, inconsistent findings from various studies, including meta-analyses, large randomized trials, observational studies, and analysis of insurance claim database, indicate that we still cannot draw any definite conclusion in terms of the safety of DPP4 inhibitors on heart failure in patients with type 2 diabetes. We should wait with prudence for the upcoming reports from Trial Evaluating Cardiovascular Outcomes with Sitagliptin (TECOS) trial [15], another large RCT with Sitagliptin including 14,724 subjects with type 2 diabetes and Liraglutide Effect and Action in Diabetes: Evaluation of Cardiovascular Outcome Results (LEADER) trial [16], to fully address all the concerns related to the safety issues of incretin-based drugs on heart failure.

CONFLICTS OF INTEREST: No potential conflict of interest relevant to this article was reported.

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        Dipeptidyl Peptidase-4 Inhibitor Alarms: Is Heart Failure Caused by a Class Effect?
        Diabetes Metab J. 2015;39(3):204-206.   Published online June 15, 2015
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      Dipeptidyl Peptidase-4 Inhibitor Alarms: Is Heart Failure Caused by a Class Effect?
      Dipeptidyl Peptidase-4 Inhibitor Alarms: Is Heart Failure Caused by a Class Effect?
      Lee Yh. Dipeptidyl Peptidase-4 Inhibitor Alarms: Is Heart Failure Caused by a Class Effect?. Diabetes Metab J. 2015;39(3):204-206.
      DOI: https://doi.org/10.4093/dmj.2015.39.3.204.

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