BMJ Open Is Committed to Open Peer Review. As Part of This Commitment We Make the Peer Review History of Every Article We Publish Publicly Available
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BMJ Open: first published as 10.1136/bmjopen-2018-022577 on 1 February 2019. Downloaded from BMJ Open is committed to open peer review. As part of this commitment we make the peer review history of every article we publish publicly available. When an article is published we post the peer reviewers’ comments and the authors’ responses online. We also post the versions of the paper that were used during peer review. These are the versions that the peer review comments apply to. The versions of the paper that follow are the versions that were submitted during the peer review process. They are not the versions of record or the final published versions. They should not be cited or distributed as the published version of this manuscript. BMJ Open is an open access journal and the full, final, typeset and author-corrected version of record of the manuscript is available on our site with no access controls, subscription charges or pay-per-view fees (http://bmjopen.bmj.com). If you have any questions on BMJ Open’s open peer review process please email [email protected] http://bmjopen.bmj.com/ on October 6, 2021 by guest. Protected copyright. BMJ Open BMJ Open: first published as 10.1136/bmjopen-2018-022577 on 1 February 2019. Downloaded from Comparative safety of the sodium glucose co-transporter 2 (SGLT2) inhibitors: A systematic review and meta-analysis. Journal: BMJ Open ManuscriptFor ID peerbmjopen-2018-022577 review only Article Type: Research Date Submitted by the 02-Mar-2018 Author: Complete List of Authors: Donnan, Jennifer; Memorial University of Newfoundland, Pharmacy Grandy, Catherine; Memorial University of Newfoundland, Pharmacy Chibrikov, Eugene; Memorial University of Newfoundland, Medicine Marra, Carlo; University of Otago, Pharmacy Aubrey-Bassler, Kris; Memorial University, Primary Healthcare Research Unit Johnston, Karissa; Memorial University of Newfoundland, Pharmacy Najafzadeh, Mehdi; Harvard Medical School, Division of Pharmacoepidemiology and Phamacoeconomics at the Brigham and Women's Hospital Swab, Michelle; Memorial University of Newfoundland Hache, Jenna; Memorial University of Newfoundland, Pharmacy Curnew, Daniel; Memorial University, Pharmacy Hai, van Nguyen; Memorial University of Newfoundland, School of Pharmacy http://bmjopen.bmj.com/ Gamble, John Michael; University of Waterloo, Pharmacy DIABETES & ENDOCRINOLOGY, EPIDEMIOLOGY, THERAPEUTICS, Keywords: Adverse events < THERAPEUTICS on October 6, 2021 by guest. Protected copyright. For peer review only - http://bmjopen.bmj.com/site/about/guidelines.xhtml Page 1 of 64 BMJ Open BMJ Open: first published as 10.1136/bmjopen-2018-022577 on 1 February 2019. Downloaded from 1 2 Comparative safety of the sodium glucose co-transporter 2 (SGLT2) inhibitors: A 3 systematic review and meta-analysis. 4 5 6 Short Running Title: Comparative Safety of SGLT2 Inhibitors 7 8 1 9 Jennifer R. Donnan , [email protected] 1 10 Catherine Grandy , [email protected] 11 Eugene Chibrikov1, [email protected] 12 1,2 13 Carlo A. Marra , [email protected] 3 14 Kris Aubrey-Bassler , [email protected] 15 Karissa Johnston1, [email protected] 16 4 For peer review only 17 Mehdi Najafzadeh , [email protected] 3 18 Michelle Swab , [email protected] 19 Jenna Hache1, [email protected] 20 1 21 Daniel Curnew , [email protected] 1 22 Hai Nguyen , [email protected] 23 John-Michael Gamble1,5 [email protected] 24 25 1 26 School of Pharmacy, Memorial University, St. John’s, Newfoundland and Labrador, Canada. 27 2 School of Pharmacy, University of Otago, Dunedin, New Zealand. 28 3 Faculty of Medicine, Memorial University, St. John’s, Newfoundland and Labrador, Canada. 29 4 30 Department of Medicine, Harvard Medical School, Boston, Massachusetts, USA 31 5 School of Pharmacy, Faculty of Science, University of Waterloo, Waterloo, Ontario, Canada. 32 33 http://bmjopen.bmj.com/ 34 Corresponding Author: John-Michael Gamble 35 School of Pharmacy 36 University of Waterloo 37 38 10A Victoria Street S 39 Kitchener, ON, Canada N2G 1C5 40 Phone: (519) 888-4567 Fax: (519) 883-7580 41 on October 6, 2021 by guest. Protected copyright. 42 [email protected] 43 44 45 46 Key Words: Type 2 Diabetes, SGLT2 Inhibitors, Adverse Events, Systematic Review 47 48 Word Count 49 50 Abstract: 299 Main Text: 4008 51 52 53 54 55 56 57 58 59 1 60 For peer review only - http://bmjopen.bmj.com/site/about/guidelines.xhtml BMJ Open Page 2 of 64 BMJ Open: first published as 10.1136/bmjopen-2018-022577 on 1 February 2019. Downloaded from 1 2 Abstract 3 4 5 Objective: To address the current knowledge gap surrounding the post-market serious safety 6 outcomes of the sodium glucose co-transporter-2 (SGLT2) inhibitors identified by the Food 7 8 and Drug Administration (FDA), the European Medicines Associations (EMA) and Health 9 Canada. 10 11 12 Design: We conducted a systematic review and meta-analysis of randomized controlled trials 13 (RCT). PubMed, Cochrane Library, EMBASE, International Pharmaceutical Abstracts, 14 ProQuest, and ClinicalTrials.gov were searched from inception to July 2017. Random effects 15 16 models were used toFor estimate peer pooled relative review risks. only 17 18 Intervention: SGLT2 Inhibitors, compared to placebo or active comparators. 19 20 21 Primary Outcomes: Acute kidney injury (AKI), diabetic ketoacidosis (DKA), urinary tract 22 infections (UTI), bone fractures, and amputations. 23 24 25 Results: We screened 1865 citations of which 99 were included in the analysis. Most studies 26 included one of four SGLT2 inhibitors, dapagliflozin, canagliflozin, empagliflozin, and 27 28 ipragliflozin. When compared to placebo, SGLT2 inhibitors were found to be significantly 29 protective against AKI (RR = 0.59; 95% CI 0.39-0.89; I2=0.0%), while no difference was found 30 for DKA (RR = 0.65; 95% CI 0.28-1.50; I2=0.0%), UTI (RR = 1.03; 95% CI 0.96-1.10; 31 2 2 32 I =0.0%), or bone fracture (RR = 0.86; 95% CI 0.67-1.09; I =2.2%). No increased risk for 33 either outcome was found when compared to active controls, and no studies reported on http://bmjopen.bmj.com/ 34 amputations. Sub-group analysis did show an increased risk of UTI with dapagliflozin only 35 2 36 (RR 1.23; 95% CI 1.03-1.46; I =4.9%), but no other analysis supported an increased risk of 37 AKI, DKA, UTI, or fracture. 38 39 40 Conclusions: Current evidence from RCTs does not suggest an increased risk of harm with 41 SGLT2 inhibitors as a class over placebo or active comparators with respect to the AKI, DKA, on October 6, 2021 by guest. Protected copyright. 42 UTI or fracture. However, wide confidence intervals for many comparisons suggest limited 43 44 precision, and therefore clinically important adverse events cannot be ruled out. 45 Dapagliflozin, does appear to independently increase the risk of UTI. 46 47 Trial Registration: PROSPERO CRD42016038715 48 49 50 51 52 53 54 55 56 57 58 59 2 60 For peer review only - http://bmjopen.bmj.com/site/about/guidelines.xhtml Page 3 of 64 BMJ Open BMJ Open: first published as 10.1136/bmjopen-2018-022577 on 1 February 2019. Downloaded from 1 2 Article Summary 3 4 5 • Our objective is to address the current knowledge gap surrounding the post-market 6 7 safety of the SGLT2 inhibitors compared to active and non-active comparators in 8 patients with type 2 diabetes. 9 10 Strengths and Limitations of the Study 11 12 • This study provides the most comprehensive systematic review of the serious adverse 13 events related to use of SGLT2 inhibitors identified by major drug regulatory agencies 14 worldwide to date. 15 16 • This study onlyFor considered peer select outcomesreview to provide only focused attention on the issues 17 concerning regulators, however this means that additional knowledge of the clinical 18 benefits and harms needs to be considered before applying the results of this study. 19 20 • Several of the outcomes (e.g., AKI, DKA, limb amputations) we evaluated occur 21 infrequently and, in some cases, were not reported at all. 22 • Certain outcomes may have been inadequately characterized within study reports. For 23 24 example, while UTIs were commonly reported among RCTs included in this meta- 25 analysis, data on complicated versus uncomplicated infections were not. 26 27 28 29 30 31 32 33 http://bmjopen.bmj.com/ 34 35 36 37 38 39 40 41 on October 6, 2021 by guest. Protected copyright. 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 3 60 For peer review only - http://bmjopen.bmj.com/site/about/guidelines.xhtml BMJ Open Page 4 of 64 BMJ Open: first published as 10.1136/bmjopen-2018-022577 on 1 February 2019. Downloaded from 1 2 3 4 1.0 Introduction 5 6 7 The sodium glucose co-transporter 2 (SGLT2) inhibitors are a novel drug class 8 available for the management of type 2 diabetes. Clinical guidelines recommend the SGLT2 9 inhibitors as one of numerous potential pharmacologic approaches for second-line therapy 10 11 following metformin failure or intolerance.[1, 2] Some clinical guidelines recommend the 12 SGLT2 inhibitor, empagliflozin, or the Glucagon-like peptide-1 (GLP-1) receptor agonist, 13 liraglutide, as preferred second-line therapies in patients with cardiovascular disease who 14 15 have failed to achieve glycemic control while on monotherapy.[1] This paradigm shift in the 16 management of typeFor 2 diabetes peer is largely review supported byonly evidence from recent landmark 17 clinical trials.[3–5] In 2015 the EMPA-REG trial showed that the SGLT2 inhibitor, 18 19 empagliflozin, significantly reduced the risk for composite endpoint of cardiovascular death, 20 myocardial infarction, or stroke by 14% and all-cause mortality by 32%, in a population with 21 existing cardiovascular disease.[3] The LEADER and SUSTAIN-6 trials have also 22 23 demonstrated similar benefits with liraglutide and semaglutide.[4, 5] 24 25 Considering the relative potential harms and benefits, clinicians and policy makers 26 must continue to integrate new pharmacotherapeutic evidence to optimize health outcomes.