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A review of potential therapeutic targets impacting CV outcomes in T2DM
Naveed Sattar, MD University of Glasgow United Kingdom Asian Cardio Diabetes Forum April 23 – 24, 2016 – Kuala Lumpur, Malaysia
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Diabetes and CVD risk: changing patterns over time
CHD equivalent CHD RISK ~ 5-15 years Diagnosis Age Sattar (2013) Diabetologia (several studies support concept)
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Empa slides 5 May 2015 Diabetes-related CV complications have declined with improved care, but substantial burden remains Years Notes These data are from 4 large national US databases that compared the 20-year trend in incidences of acute MI and stroke among patients with diabetes and the standardised US population. Diabetes-related complications have declined during this period with fewer cases per 10,000 of MI and 58.9 fewer cases per 10,000 of stroke. However, despite this considerable improvement, the rates remain higher in patients with diabetes than in the non-diabetic population. Furthermore, the absolute numbers of complications will continue to rise because of the large increase in the number of prevalent cases of diabetes. 2010 data: Non-diabetes: MI = 25.8, stroke = 34.3. Diabetes: MI = 45.5, stroke = 52.9. Abbreviations CV, cardiovascular; MI, myocardial infarction; T2D, Type 2 Diabetes. CV, cardiovascular; MI, myocardial infarction. Adapted from Gregg EW, et al. N Engl J Med. 2014;370:1514–1523.
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Glucose-lowering vs CVD
Knowns and unknowns Many ways to lower sugar – Method more important than glucose-lowering per se? What do we know about Metformin / SU / TZDs? DPP4i and GLP-1?
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Evolution of T2D agents DPP4 inhibitors SGLT2 inhibitors Older T2D agents Newer T2D agents 1950 1960 1970 1980 1990 2000 2010 2012 2013 GLP1 receptor agonists Lente class of insulins produced Recombinant human insulin produced Glimepiride: 3rd generation SU Insulin degludec SUs first used 2nd generation SUs available Insulin glargine available2 Notes Metformin was one of the earliest oral therapies introduced for T2D (in for the UK, in 1995 for the US). The timings of DPP4i and GLP-1 agonists are adapted slightly from the paper, as in fact, they emerged at roughly the same time (e.g. saxagliptin approved in 2009; liraglutide approved 2009): Abbreviations DPP4, dipeptidyl peptidase-4; GLP, glucagon-like peptide; SGLT, sodium glucose cotransporter; SU, sulphonylurea; TZD, thiazolidinedione; T2D, Type 2 diabetes. Reference Lantus® Summary of Product Characteristics: Metformin introduced Metformin introduced in the UK Three new classes introduced: -glucosidase inhibitors, meglitinides and TZDs Adapted from 1. Kirby. Br J Diabetes Vasc Dis 2012;12:315– Lantus® SPC.
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Metformin: MOA Metformin1 Hyperglycaemia Intestine Liver
Skeletal muscle Glucose utilisation Gluconeogenesis Glycogenolysis Fatty acid oxidation Insulin-mediated glucose uptake Glycogenesis Fatty acid oxidation Hyperglycaemia Notes Metformin is a first-line glucose-lowering agent and is most widely used to treat T2D. Metformin decreases hyperglycaemia primarily by suppressing glucose production (inhibition of gluconeogenesis) by the liver. In addition to its glucose-lowering effect, metformin has been found to provide various benefits, e.g., improving plasma lipid profile, as shown in large clinical trials.1 The effects of metformin on CV risk factors require further assessment, but may include improved lipid profiles, anti-atherogenic effects, decreased ischaemic injury and amelioration of oxidative stress.1 Recent research at the gut level reveals new pharmacological actions of metformin including alteration of bile acid recirculation and gut microbiota resulting in enhanced enteroendocrine hormone secretion (particularly GLP1)2 Abbreviations CV, cardiovascular; MOA, mechanism of action; T2D, Type 2 diabetes. Reference 1. Batchuluun et al. J Endocrinol Diabetes Obes 2014;2:1035 2. Napolitano A et al. PLoS ONE 2014; 9(7): e100778 In addition to its glucose-lowering effects, metformin may have potential effects on the CV system, e.g., improving plasma lipid profile2 Adapted from 1. Bailey & Feher. Therapies for Diabetes Batchuluun et al. J Endocrinol Diabetes Obes 2014;2:1035.
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UKPDS 34 CV effects of metformin in overweight patients
Risk of MI is 39% lower with metformin vs conventional therapy in obese patients1,2 Significant reduction in MI maintained over 10 years’ follow-up3 Myocardial infarction Metformin vs conventional p = 0.01 Time from randomisation (years) 3 6 9 12 15 0.0 10 20 30 Proportion of patients with events (%) Intensive (n = 951; events = 139) Conventional (n = 411; events = 73) Metformin (n = 342; events = 39) 1.4 1.2 1.0 0.8 0.6 0.4 HR (95% CI) RR 0.611 p = 0.01 RR 0.67 p = 0.005 Overall values at study end in 1997 Annual values during 10-year post-trial monitoring period Notes UKPDS provides evidence for the beneficial CV effects of metformin. In UKPDS 34, the metformin group had a 39% lower risk of MI than the conventional treatment group (p = 0.01).1 The significant reduction in MI risk was maintained over 10 years,2 as shown in the right-hand figure where all the upper CI limits are below the HR = 1.0 line. Metformin added to SU vs SU alone was associated with increased risk of diabetes-related death (RR of 1.96, p=0.039) and all-cause mortality (RR of 1.60 p=0.041).1 Abbreviations CV, cardiovascular; HR, hazard ratio; MI, myocardial infarction; RR, relative risk (in original study1); risk ratio (in follow-up study2); SU, sulphonylurea; UKPDS, United Kingdom Prospective Diabetes Study. References Metformin 500 mg tablets. Summary of Product Characteristics. Aurobindo Pharma Milpharm Ltd. Available at: Accessed 26 Jun 2015 1997 1999 2001 2003 2005 2007 No. of events: Conventional therapy 73 83 92 106 118 126 Metformin 39 45 55 64 68 81 1. UKPDS 34. Lancet 1998;352:854– Holman et al. N Engl J Med 2008;359:1577–89
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Sulphonylureas: MOA Notes
SUs are a common second-line therapy for T2D (after metformin). SUs lower glucose by stimulating insulin secretion from the pancreas. Normally, the metabolism of an influx of glucose causes the ATP/ADP ratio to rise, leading to closure of the KATP channel, depolarisation of the β-cell membrane, influx of calcium ions and, finally, the release of insulin from storage granules. SUs bind to a specific receptor on the KATP channel, causing it to close and triggering the same series of events, and also causing impaired ischaemic pre-conditioning in cardiac myocytes. Abbreviations ADP, adenosine diphosphate; ATP, adenosine triphosphate; KATP, adenosine triphosphate-dependent potassium channel; MOA, mechanism of action; SU, sulphonylurea; SUR, SU receptor; T2D, Type 2 diabetes. Reference The figure was produced using Servier Medical Art: Reproduced from 1. Gore and McGuire. Eur Heart J 2011;32:1832–4.
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Meta-analysis SU CV safety trials (≥ 6 months) no consistent association with MACE risk1
0.01 0.1 1 10 100 Favours SUs Favours comparators MH-OR (95% CI) First author (year) Birkeland 1996 Chou 2008 Perriello 2006 Gerstein 2010 UKPDS Hanefeld 2007 Seino 2010 Charbonnel 2005 Matthews 2005 Rubin 2008 Home 2009 Arechavaleta 2011 va der Laar 2004 Mazzone 2006 Riddle 1998 Giles 2010 Tolman 2009 Kahn 2006 Goke 2010 Garber 2009 Nissen 2008 Ristic 2007 Ferrannini 2009 Bakris 2006 Gallwitz 2012 Jain 2006 Johnston 1998 Nauck 2011 Seck 2010 Overall Notes A meta-analysis was conducted of trials of duration ≥ 6 months that compared an SU with a non-SU agent in patients with T2D. MH-ORs were calculated for MACE. There was variability among trials, but overall the risk of MACE was not increased in patients treated with SUs vs other agents (p = 0.52). However, the authors concluded that the CV safety of SUs cannot be considered established unless evaluated in long-term CVOTs. Abbreviations CI, confidence interval; CV, cardiovascular; CVOT, cardiovascular outcomes trial; MACE, major adverse cardiovascular events; MH-OR, Mantel-Haenszel odds ratio; SU, sulphonylurea; T2D, Type 2 Diabetes. Overall MACE risk estimate: MH-OR 1.08 (0.86–1.36) Mortality MH-OR: 1.22 (1.01–1.49) Monami et al. Diabetes Obes Metab 2013;15:938–53.
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TZDs (PPAR-γ agonists): MOA
Skeletal muscle Adipose Liver Glucose uptake PPAR activation Gluconeogenesis Adipogenesis Fatty acid uptake Lipogenesis Glucose uptake Notes PPAR activation regulates the expression of multiple target genes involved in glucose homeostasis, fatty acid oxidation and lipid metabolism. In addition to improving glucose control and insulin sensitivity, TZDs reduce concentrations of atherogenic lipoproteins and decrease inflammatory mediators. Abbreviations FFA, free fatty acid; PPAR, peroxisome proliferator-activated receptor; TZD, thiazolidinedione. Plasma FFA Hyperglycaemia Adapted from Bailey & Feher. Therapies for Diabetes 2004.
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In 2007, separate meta-analyses suggested differing CV effects of drugs within the TZD class
Rosiglitazone meta-analysis1 1.0 2.0 Favours rosiglitazone Favours control MI OR 1.43 (95% CI: 1.03‒1.98) p = 0.03 CV death OR 1.64 (95% CI: 0.98‒2.74) p = 0.06 Pioglitazone meta-analysis2 1.0 2.0 Favours pioglitazone Favours control MI HR 0.81 (95% CI: 0.64‒1.02) p = 0.08 Death HR 0.92 (95% CI: 0.76‒1.11) p = 0.38 Notes Examination of similar endpoints within two separate meta-analyses for rosiglitazone and pioglitazone (compared with placebo or active comparator) suggests differing CV effects of the 2 agents, despite being of the same class. Compared with controls, rosiglitazone was associated with a significantly increased risk of MI and an increased risk of CV-related death that was of borderline significance.1 By contrast, there was a tendency for fewer incidences of MI (HR 0.81) or death (HR 0.92) with pioglitazone: Pioglitazone was also associated with a significantly lower risk of death, MI or stroke (the composite primary endpoint; HR 0.82; 95% CI: 0.72–0.94; p = 0.005), but a significantly increased risk of serious HF (HR 1.41; 95% CI: 1.14–1.76; p = 0.002).2 Rosiglitazone meta-analysis Included 42 trials (inclusion criteria were study duration of more than 24 weeks, the use of a randomized control group not receiving rosiglitazone, and the availability of outcome data for MI and death from CV causes). Pioglitazone meta-analysis Included 19 trials (inclusion criteria were that studies be randomized, double-blinded, and controlled with placebo or active comparator). The primary objective of most of the trials was to determine the efficacy of pioglitazone (with or vs insulin, metformin, SUs or rosiglitazone) in improving glycaemic control. Six trials had other primary endpoints: hepatic toxicity (OPI-506 study), triglyceride levels (GLAI study), changes in carotid intima-medial thickness (CHICAGO trial), CV outcomes among patients with established vascular disease (PROactive), walking distance among patients with mild cardiac disease (OPI-520 study), or heart failure progression among patients with advanced CHF (OPI-504). Of the total 16,390 patients included in the meta-analysis; PROactive was the largest single trial (n = 5,238). Abbreviations CHF, congestive heart failure; CI, confidence interval; CV, cardiovascular; HF, heart failure; HR, hazard ratio; MI, myocardial infarction; OR, odds ratio. References 1. Nissen & Wolski. N Engl J Med 2007;356:2457– Lincoff et al. JAMA 2007;298:1180–8. No clinical trial directly compares the CV effects of pioglitazone and rosiglitazone 1. Nissen & Wolski. N Engl J Med 2007;356:2457– Lincoff et al. JAMA 2007;298:1180–8.
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Rosiglitazone: RECORD study results showed no increase in CV death
Rosiglitazone N = 2220 Active control N = 2227 HR 95% CI Primary endpoint CV death or CV hospitalisation 321 323 0.99 0.85–1.16 Secondary endpoint All-cause death 136 157 0.86 0.68–1.08 CV death 60 71 0.84 0.59–1.18 MI 64 56 1.14 0.80–1.63 Stroke 46 63 0.72 0.49–1.06 CV death, MI or stroke 154 165 0.93 0.74–1.15 Heart failure 61 29 2.10 1.35–3.27 CV outcomes for RECORD trial (original data)1,2 Notes The RECORD study showed no increase in CV death with rosiglitazone.1 In 2013, the FDA reduced safety restrictions on rosiglitazone.2 However, controversy still remains, as there are no long-term prospective CV safety data for this agent.3 Abbreviations CI, confidence interval; CV, cardiovascular; FDA, Food and Drug Administration; HR, hazard ratio; MI, myocardial infarction; RECORD, Rosiglitazone Evaluated for Cardiac Outcomes and Regulation of glycaemia in Diabetes. References AVANDIA US prescribing Information: /en/Prescribing_Information/Avandia/pdf/AVANDIA-PI-MG.PDF. FDA safety information: m htm Rosenson et al. Am Heart J 2012;164:672–80. In 2013, FDA panel voted to reduce safety restrictions on rosiglitazone3 1. AVANDIA US Prescribing information. 2. Home et al. Lancet 2009;373:2125– FDA Safety Information. 4. Rosenson et al. Am Heart J 2012;164:672–80.
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Published on-line: February 17, 2016 DOI: 10.1056/NEJMoa1506930
U.S. National Institute of Neurological Disorders and Stroke (Grant # U01NS044976) Published on-line: February 17, 2016 DOI: /NEJMoa
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IRIS Secondary Outcomes
Pioglitazone (N=1939) Placebo (N=1937) Outcome* % (No.) Hazard Ratio (95% CI) P Stroke 6.5 (127) 8.0 (154) 0.82 0.19 ACS 5.0 (96) 6.6 (128) 0.75 0.11 Stroke/MI/HF 10.6 (206) 12.9 (249) DM 3.8 (73) 7.7 (149) 0.48 <.0001 Death 7.0 (136) 7.5 (146) 0.93 0.52 *ACS=Acute coronary syndrome (unstable angina or MI). *HF=heart failure Kernan WN et al. N Engl J Med, published on-line Feb 17, 2016 DOI: /NEJMoa
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IRIS: Summary Among insulin resistant, non-diabetic patients with ischemic stroke/TIA, pioglitazone over 5 yrs prevented: Stroke or MI Relative Risk Reduction 24% Absolute Risk Reduction 2.9% Diabetes Relative Risk Reduction 52% Absolute Risk Reduction 3.9% However, serious bone fracture was more common with pioglitazone (5.1% vs. 3.2%) Kernan WN et al. N Engl J Med, published on-line Feb 17, 2016 DOI: /NEJMoa
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Summary on TZDs Evidence for PIO and CVD (stroke and MI) prevention exists But more fluid retention, weight gain, fractures, HF No evidence of CVD death benefit Rosiglitazone likely no net CVD harm Pio – good glycaemia effect – use lower doses to minimise side effects?
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EFFECT of Glucose lowering per se
Potentially independent of mode
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Benefit of different interventions per 200 diabetes pts treated for 5 years
Per 0.9% lower HbA1c Per 4mmHg lower SBP Per 1mmol/L lower LDL-C Ray et al Lancet 2009 Meta-analysis of intensive glucose-lowering trials 18
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Totality of evidence: glucose lowering data
hard to decipher but lowering HbA1c per se - lowers microvascular risk (better earlier in disease; later reduction less beneficial?) - Slow burn benefit impact on CVD - If lower too aggressively, potential harm (ACCORD) - Glucose-lowering agents ≠ CVD
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Uncertainty: guidelines - HbA1c targets vary by patient characteristics
Near diagnosis: 6.5% sensible But 7 to 7.5% fine for most Relax: elderly, long duration, frail, short life expectancy, hypoglycaemia risk, CVD Inzucchi et al (2015) Diabetes Care
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New approaches to reducing blood glucose
Inhibit gastro- intestinal absorption (α-glucosidase inhib’s) GLP-1 agonists/analogues e.g. exenatide Stimulate insulin release Incretins (GIP) GLP-1 Reduce blood glucose Inhibit glucagon release DPP4 Breakdown products Inhibit renal re-absorption (SGLT2 inhibitors) DPP4 inhibitors (“gliptins”)
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CV safety trials: 5 down, many to come
CANVAS-R8 (n = 5700) Albuminuria 2013 2014 2015 2016 2017 2018 2019 SAVOR-TIMI 531 (n = 16,492) 1,222 3P-MACE EXAMINE2 (n = 5380) 621 3P-MACE TECOS4 (n = 14,724) ≥ P-MACE LEADER6 (n = 9340) ≥ 611 3P-MACE SUSTAIN-67 (n = 3297) 3P-MACE DECLARE-TIMI 5815 (n = 17,150) ≥ P-MACE EMPA-REG OUTCOME®5 (n = 7034) ≥ 691 3P-MACE CANVAS10 (n = 4365) ≥ 420 3P-MACE CREDENCE17 (n = 3700) Renal + 5P-MACE CAROLINA®11 (n = 6000) ≥ 631 4P-MACE ITCA CVOT9 (n = 4000) 4P-MACE EXSCEL14 (n = 14,000) ≥ P-MACE DPP4 inhibitor CVOTs SGLT2 inhibitor CVOTs GLP1 CVOTs Ertugliflozin CVOT18 (n = 3900) OMNEON13 CARMELINA12 (n = 8300) 4P-MACE + renal REWIND16 (n = 9622) ≥ P-MACE 2021 ELIXA3 (n = 6068) ≥ 844 4P-MACE Notes This overview indicates all of the ongoing (and two completed – SAVOR-TIMI 53 and EXAMINE) CVOTs for the newer T2D agents. The trial name, the estimated recruitment and the primary outcome are indicated The timings indicate the estimated completion dates of the trial Planned or actual event rates are indicated in some cases (e.g. EXAMINE, ELIXA etc) Abbreviations CANVAS, Canagliflozin Cardiovascular Assessment Study CANVAS-R, Study of the Effects of Canagliflozin on Renal Endpoints in Adult Subjects with T2DM CARMELINA®, Cardiovascular Safety & Renal Microvascular Outcome Study with Linagliptin CAROLINA®, Cardiovascular Outcome Study of Linagliptin Versus Glimepiride in Patients With Type 2 Diabetes CREDENCE, Evaluation of the Effects of Canagliflozin on Renal and Cardiovascular Outcomes in Participants With Diabetic Nephropathy CVOT, cardiovascular outcomes trial DPP4, dipeptidyl peptidase 4 DECLARE-TIMI, Multicenter Trial to Evaluate the Effect of Dapagliflozin on the Incidence of Cardiovascular Events ELIXA, Evaluation of Lixisenatide in Acute Coronary Syndrome EMPA-REG OUTCOME® [cardiovascular outcomes trial of empagliflozin] EXAMINE, Examination of Cardiovascular Outcomes with Alogliptin versus Standard of Care EXSCEL, The EXenatide Study of Cardiovascular Event Lowering GLP1, glucagon-like peptide 1 LEADER®, Liraglutide Effect and Action in Diabetes: Evaluation of Cardiovascular Outcome Results OMNEON™ [randomised, double-blind, placebo-controlled, multicenter study to assess cardiovascular outcomes following treatment OMNEON™ is full title] REWIND, Researching Cardiovascular Events With a Weekly Incretin in Diabetes SAVOR-TIMI, Saxagliptin Assessment of Vascular Outcomes Recorded in Patients with Diabetes Mellitus - Thrombolysis in Myocardial Infarction SGLT2, sodium glucose cotransporter 2 SUSTAIN, Trial to Evaluate Cardiovascular and Other Longterm Outcomes With Semaglutide in Subjects With Type 2 Diabetes T2D, Type 2 diabetes TECOS, Trial Evaluating Cardiovascular Outcomes with Sitagliptin 3P-MACE, 3-point major adverse cardiovascular events (CV death, non-fatal myocardial infarction or non-fatal stroke) 4P-MACE, 4-point major adverse cardiovascular events (CV death, non-fatal myocardial infarction, non-fatal stroke or unstable angina requiring hospitalisation) References 1. Scirica et al. N Engl J Med 2013;369:1317–26. 2. White et al. N Engl J Med 2013;369:1327–35 3. Bentley-Lewis et al. Am Heart J 2015;0:1–8.e7. 4. Bethel et al. Diabetes Obes Metab 2015;17:1395–402 5. Zinman et al. Cardiovasc Diabetol 2014;13:102 6. NCT 7. NCT 8. NCT 9. NCT 10. NCT 11. NCT 12. NCT 13. NCT 14. NCT 15. NCT 16. NCT 17. NCT 18. NCT 19. NCT Timings estimated from ClinicalTrials.gov.
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New approaches to reducing blood glucose
GLP-1 agonists/analogues e.g. exenatide Stimulate insulin release Incretins (GIP) GLP-1 Reduce blood glucose Inhibit glucagon release DPP-4 Breakdown products Inhibit renal re-absorption (SGLT2 inhibitors) DPP-4 inhibitors (“gliptins”)
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0.2-0.3% 0.36% 0.3% 0.27% 0.3-0.5% Saxagliptin (DPP-4 inhibitor)
Therapy Trial N Population Follow-up duration HbA1c difference during follow-up Primary outcome Saxagliptin (DPP-4 inhibitor) SAVOR-TIMI 53 16,492 +CVD (80%) or –CVD at high risk (20%) 24 months % CVD death, NF MI or stroke Alogliptin EXAMINE 5,380 MI or UA within last days 18 months 0.36% Sitagliptin TECOS 14,671 +CVD 36 months 0.3% CVD death, NF MI or stroke, hospitalization for UA Lixisenatide (GLP-1R agonist) ELIXA 6,068 MI or UA within last 180 days 25 months 0.27% Empagliflozin (SGLT2 inhibitor) EMPA-REG Outcomes 7,020 37 months %
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Effects on other risk factors and CVD?
DPP-4 inh. GLP-1 agonist SGLT2 inh. Hypo risk Low Weight Neutral Lower BP Lipids Improved HDL /LDL-c? CVOT results Neutral CVD ELIXA ??? Other points Small HF signal Saxa WAIT FOR LEADER EXSCEL Infections? DKA?
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PRIMARY OUTCOMES for DPP4i trials all negative
No CVD benefit in major trials – EXAMINE, SAVOR-TIMI, TECOS Should we surprised? No HbA1c difference only 0.3% Median durations of follow-up short <2 years No other risk factors altered Medications would have needed very strong ‘pleiotropic’ actions to yield CVD benefit
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Cardiovascular outcome trials in T2D GLP-1 agents
Treatment Inclusion criteria Primary endpoint Number of patients EXSCEL Placebo Exenatide Once weekly T2D HbA1c ≥ 7.0−< 10.0% CVD in 60% CV death, MI or stroke >14000 ELIXA Lixisenatide ACS HbA1c ≥ 6.0−≤ 10.0% CV death, MI, UA or stroke 6000 LEADER Liraglutide HbA1c ≥ 7.0% ≥ 50 years + CVD ≥ 60 years + CV risk factors 8754 ACS, acute coronary syndrome; CV, cardiovascular; CVD, cardiovascular disease; GLP-1, glucagon-like peptide-1; HbA1c, glycosylated haemoglobin; MI, myocardial infarction; T2D, Type 2 Diabetes; UA, unstable angina.
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Method, more than absolute glucose reduction may matter to CVD risks
Small reductions in glucose alone for short time will not lower CVD DPP4; ORIGIN (early insulin) Drugs must do more than just lower glucose Proven for CVD benefit Metformin (UKPDS, less weight, no hypos) Pioglitazone (Stroke, MI, but increases HF, weight etc) Empagaflozin (hear later) Liraglutide (data coming)
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Summary: CVD in DM: lipids, BP, smoking and specific diabetes agents?
Clear evidence CVD in DM over several decades Better management CVD risk factors big part BP and LDL-c reduction >> glucose reduction But many sub-optimally treated; high death rates if DM & CVD Lower HbA1c targets early in disease but relax if CVD or long duration or frail Recent trial data enormously beneficial – not necessarily how much we lower glucose, but how we target it - “paradigm shift”?
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