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Efficacy and safety of canagliflozin in patients with type 2 diabetes based on history of cardiovascular disease or cardiovascular risk factors: a post hoc analysis of pooled data

Cardiovascular Diabetology volume 16, Article number: 40 (2017) Cite this article

Abstract

Background

Treatment of patients with type 2 diabetes mellitus (T2DM) and a history of cardiovascular (CV) disease or CV risk factors may present clinical challenges due to the presence of comorbid conditions and the use of concomitant medications. The sodium glucose co-transporter 2 inhibitor, canagliflozin, has been shown to improve glycaemic control and reduce body weight and blood pressure (BP) with a favourable tolerability profile in a broad range of patients with T2DM. This post hoc analysis assessed the efficacy and safety of canagliflozin in patients with T2DM based on CV disease history or CV risk factors.

Methods

Analyses were based on pooled data from four 26-week, placebo-controlled, Phase 3 studies that evaluated canagliflozin 100 and 300 mg in patients with T2DM (N = 2313; mean HbA1c, 8.0%; body weight, 89 kg; systolic BP, 128 mmHg). Changes from baseline to week 26 in HbA1c, body weight, and systolic BP were assessed based on history of CV disease, history of hypertension, baseline statin use, and number of CV risk factors. Safety was assessed based on adverse event (AE) reports.

Results

At week 26, both canagliflozin doses lowered HbA1c, body weight, and systolic BP compared with placebo in patients with and without CV disease history or risk factors. Placebo-subtracted HbA1c reductions with canagliflozin 100 and 300 mg were similar in patients with a history of CV disease (−0.95 and −1.07%) versus no history of CV disease (−0.71 and −0.90%), history of hypertension (−0.72 and −0.89%) versus no history of hypertension (−0.73 and −0.95%), baseline statin use (−0.77 and −0.99%) versus no statin use (−0.69 and −0.85%), and 0–1 CV risk factor (−0.72 and −0.87%) versus ≥2 CV risk factors (−0.74 and −1.02%). Similar body weight and systolic BP reductions were seen with canagliflozin versus placebo across subgroups. The incidence of AEs, AEs leading to discontinuation, and serious AEs was similar across subgroups.

Conclusions

The efficacy and safety of canagliflozin were generally consistent across subgroups of patients with T2DM and varying degrees of CV disease history or risk factors.

Trial registration numbers and dates ClinicalTrials.gov: NCT01081834, 4 March 2010; NCT01106625, 1 April 2010; NCT01106677, 1 April 2010; NCT01106690, 1 April 2010

Background

Type 2 diabetes mellitus (T2DM) affects roughly 400 million adults across the globe and contributes to 5 million deaths annually [1]. The majority of these deaths are a result of cardiovascular (CV) complications, which are very common in patients with T2DM due to poorly controlled chronic hyperglycaemia and reduced insulin sensitivity [2,3,4]. Other major contributors to increased CV risk in patients with T2DM include comorbid conditions such as hypertension and dyslipidaemia [5, 6]. The presence of these comorbid conditions and the associated requirements for concomitant medication use can present significant clinical challenges in the treatment of patients with T2DM and a history of CV disease or CV risk factors [7, 8].

Some pharmacologic agents may not be suitable for patients with T2DM and existing CV disease or CV risk factors. For instance, the prescribing information for the sulphonylureas glipizide [9] and glyburide [10] include a warning for increased risk of CV death, and the prescribing information for pioglitazone includes a warning for congestive heart failure [11]. Additionally, guidelines from the American Diabetes Association recommend against the use of agents associated with hypoglycaemia in patients with T2DM and coronary artery disease [7]. Overall, there remains a need for antihyperglycaemic agents (AHAs) that are efficacious and well tolerated in people with T2DM and CV disease history/risk factors; ideally, such medications would provide not only improved glycaemic control but also favourable effects on CV risk factors such as body weight, hypertension, and dyslipidaemia.

Canagliflozin is a sodium glucose co-transporter 2 (SGLT2) inhibitor approved for the treatment of adults with T2DM. Canagliflozin lowers the renal threshold for glucose, thereby promoting urinary glucose excretion (UGE) and resulting in a mild osmotic diuresis and a net caloric loss [12, 13]. The mechanism of action for canagliflozin is independent of insulin and is complementary to other AHAs, with a low inherent risk for hypoglycaemia. Across Phase 3 clinical trials, canagliflozin has been shown to provide improvements in glycaemic control as well as reductions in body weight and blood pressure (BP) as monotherapy and in combination with other AHAs in a broad range of patients with T2DM [14].

In this analysis, the efficacy and safety of canagliflozin was assessed among patients with T2DM in subgroups based on CV disease history and CV risk factors using pooled data from four 26-week, placebo-controlled, Phase 3 studies [15,16,17,18].

Methods

Patients and study design

These post hoc analyses were based on pooled data from four 26-week, randomised, placebo-controlled, Phase 3 studies of canagliflozin 100 and 300 mg in patients with T2DM. These studies included evaluation of canagliflozin compared with placebo as monotherapy in patients with T2DM inadequately controlled with diet and exercise (ClinicalTrials.gov Identifier: NCT01081834) [15], and as combination therapy in patients on background metformin (NCT01106677) [16], metformin plus sulphonylurea (NCT01106625) [17], and metformin plus pioglitazone (NCT01106690) [18]. In all studies, patients were randomised to receive canagliflozin 100 or 300 mg or placebo once daily during a 26-week, double-blind, core treatment period, followed by a 26-week extension period. Data from the 26-week core treatment periods of each study were included in this pooled analysis. The high glycaemic subset (HbA1c >10 and ≤12.0%) of the monotherapy study [15] was not placebo controlled, and the sitagliptin arm of the add-on to metformin study [16] was not prespecified for efficacy comparisons versus canagliflozin at week 26; therefore, these populations were excluded from the analysis.

Key inclusion criteria for these studies are summarised in Table 1. Key exclusion criteria common to all studies included repeated fasting plasma glucose (FPG) generally ≥15.0 mmol/L during the pretreatment phase; history of diabetic ketoacidosis or type 1 diabetes; history of myocardial infarction, unstable angina, revascularisation procedure, or cerebrovascular accident within 3 months of screening; uncontrolled hypertension; and alanine aminotransferase level >2 times the upper limit or normal or total bilirubin >1.5 times the upper limit of normal at screening [19].

Table 1 Study design and patient population
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Details of the individual study designs have been previously reported [15,16,17,18]. Briefly, in each study, eligible patients who were on protocol-specified background AHA treatment entered into a 2-week, placebo run-in period. Patients who were not on protocol-specified background AHA treatment (n = 821; 35.5%) entered an 8- to 12-week adjustment/dose stabilisation period prior to the placebo run-in period. After the placebo run-in period, patients were randomised (1:1:1) to canagliflozin 100 or 300 mg or placebo. Glycaemic rescue therapy using an AHA that was complementary to the protocol-specified background therapy was initiated using protocol-specified FPG criteria.

All studies were conducted in accordance with ethical principles originating in the Declaration of Helsinki and were consistent with Good Clinical Practices and applicable regulatory requirements. Approval was obtained from institutional review boards and independent ethics committees for participating centres, and written informed consent was provided by all patients prior to participation.

Study endpoints and assessments

For this post hoc analysis, data from patients who received canagliflozin 100 or 300 mg or placebo in these four clinical trials were pooled and analysed in four different subgroups: (1) history of CV disease (yes/no); (2) history of hypertension (yes/no); (3) statin use at baseline (yes/no); and (4) number of CV risk factors at baseline (0–1 or ≥2), defined as current cigarette smoker, T2DM history of ≥10 years, baseline high-density lipoprotein cholesterol (HDL-C) of <39 mg/dL, micro- or macro-albuminuria (i.e., baseline albumin to creatinine ratio of ≥30 mg/g), and screening systolic BP >140 mmHg. The terms used to define history of CV disease or history of hypertension and statin use at baseline are provided in Additional file 1. Efficacy endpoints assessed at week 26 for each subgroup included changes from baseline in HbA1c, body weight, and systolic BP. Safety assessments across subgroups included overall incidence of adverse events (AEs), AEs leading to discontinuation, AEs related to study drug, serious AEs, and deaths.

Statistical analyses

All analyses used data from the modified intent-to-treat (mITT) population from each study, which consisted of all randomised patients who received ≥1 dose of double-blind study drug. Missing data at week 26 were imputed using the last observation carried forward (LOCF). For patients who received glycaemic rescue therapy, the last post-baseline value prior to the initiation of rescue therapy was used for efficacy analyses. Efficacy endpoints were assessed using an analysis of covariance (ANCOVA) model, with treatment and study factors and the representative baseline value as a covariate. Least squares (LS) means and 95% confidence intervals (CIs) were estimated for comparisons of each canagliflozin dose with placebo. Statistical testing of canagliflozin versus placebo was not prespecified for analyses of efficacy parameters in these post hoc analyses. Therefore, no P values are reported; however, 95% CIs are provided for descriptive purposes.

Results

Patients

A total of 2313 patients were included in the mITT population; of these, 155 patients (6.7%) had a history of CV disease, 1433 (62.0%) had a history of hypertension, and 945 (40.9%) were using statins at baseline; 1727 patients (74.7%) had 0 or 1 CV risk factor and 586 (25.3%) had ≥2 CV risk factors. In the overall population, patient demographic and disease characteristics were generally balanced across treatment groups (Table 2). Baseline HbA1c, body weight, and systolic BP values in subgroups by CV disease history or CV risk factors are shown in Figs. 1, 2, 3. Generally, patients in the higher CV risk subgroups had higher baseline body weight and systolic BP values.

Table 2 Baseline demographic and disease characteristics (overall population)
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Fig. 1
figure 1

Change from baseline in HbA1c at week 26. a History of CV disease, b history of hypertension, c baseline statin use, d number of CV risk factors. CV cardiovascular, LS least squares, SE standard error, CI confidence interval, PBO placebo, CANA canagliflozin

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Fig. 2
figure 2

Change from baseline in body weight at week 26. a History of CV disease, b history of hypertension, c baseline statin use, d number of CV risk factors. CV cardiovascular, LS least squares, SE standard error, CI confidence interval, PBO placebo, CANA canagliflozin

Full size image
Fig. 3
figure 3

Change from baseline in systolic BP at week 26. a History of CV disease, b history of hypertension, c baseline statin use, d number of CV risk factors. BP blood pressure, CV cardiovascular, LS least squares, SE standard error, CI confidence interval, PBO placebo, CANA canagliflozin

Full size image

Efficacy

As shown in Fig. 1, LS mean changes in HbA1c from baseline to week 26 were greater with canagliflozin 100 and 300 mg than with placebo in all subgroups. Placebo-subtracted reductions in HbA1c were similar across subgroups, regardless of the presence or absence of history of CV disease or history of hypertension, baseline statin use, or 0–1 versus ≥2 CV risk factors. LS mean changes in body weight (Fig. 2) and systolic BP (Fig. 3) from baseline to week 26 were also greater with canagliflozin 100 and 300 mg than with placebo in all subgroups. Placebo-subtracted reductions in body weight were similar across subgroups, regardless of the presence or absence of history of CV disease or history of hypertension, baseline statin use, or 0–1 versus ≥2 CV risk factors.

Safety

Canagliflozin 100 and 300 mg were generally well tolerated across subgroups by CV disease history or CV risk factors. The incidence of overall AEs, AEs leading to discontinuation, and serious AEs was similar with canagliflozin 100 and 300 mg and placebo across subgroups (Table 3).

Table 3 Overall safety summary
Full size table

Discussion

Patients with T2DM are at increased risk for CV disease, in part because of increased prevalence of comorbidities such as hypertension and dyslipidaemia [20, 21]. The presence of CV disease and CV risk factors can complicate T2DM management [8]. This post hoc analysis evaluated the efficacy and safety of canagliflozin 100 and 300 mg in patients with T2DM based on history of CV disease, history of hypertension, baseline use of statins, and the number of CV risk factors. To have a sufficient sample size for analysis that was representative of a diverse population of patients with T2DM, data were pooled from four similarly designed 26-week, placebo-controlled studies of canagliflozin. Results from these analyses showed that treatment with canagliflozin provided meaningful reductions in HbA1c, body weight, and systolic BP that were similar regardless of the presence or absence of history of CV disease, history of hypertension, baseline statin use, or number of CV risk factors. Across subgroups by CV disease history or risk factors, both doses of canagliflozin were generally well tolerated, with a safety profile consistent with that reported across clinical trials of canagliflozin [14, 22, 23]. In the overall population, the incidence of AEs was similar with canagliflozin and placebo; not surprisingly, an increased incidence of AEs related to the mechanism of SGLT2 inhibition (e.g., genital mycotic infections, osmotic diuresis–related AEs) was seen with canagliflozin [19, 22, 24].

Given the high burden of CV disease among patients with T2DM, some guidelines recommend a multifactorial approach to managing T2DM [7, 25]. SGLT2 inhibitors, such as canagliflozin, have been shown to provide significant improvements in HbA1c, body weight, and BP in a broad range of patients with T2DM [23], including older patient populations (≥65 and ≥75 years of age) who may be at elevated risk of CV disease [26, 27]. To improve dyslipidaemia, the European Society of Cardiology recommends statin therapy for all patients with T2DM over 40 years of age and for selected younger patients with elevated CV disease risk [28]. Despite this recommendation, less than 50% of patients in this population were using statins at baseline. Statin therapy has been shown to be associated with increased HbA1c levels in patients with T2DM [29,30,31,32]. In the current analysis, canagliflozin treatment provided clinically meaningful improvements in HbA1c in patients with T2DM, regardless of baseline statin use.

Choice of AHAs may be limited for patients with T2DM and CV disease history and CV risk factors based on data suggesting an increased risk for negative CV outcomes with some agents [9,10,11]. There is a growing body of evidence that SGLT2 inhibitors can provide cardiometabolic benefits beyond glycaemic control. In the EMPA-REG OUTCOME trial, empagliflozin showed a significant reduction in the risk of CV death and heart failure hospitalisation compared with placebo [33]. Based on these results, the US Food and Drug Administration recently approved a new indication for empagliflozin to reduce the risk of CV death in adult patients with T2DM and established CV disease [34]. It is hypothesised that the mechanism for the cardioprotective effect seen with empagliflozin is likely relevant for the entire SGLT2 inhibitor class due to improvements in glycaemic control, as well as BP and body weight reduction via induction of a mild osmotic diuresis, increased natriuresis, and net caloric loss [35,36,37,38]. In particular, it has been postulated that the increased osmotic diuresis associated with SGLT2 inhibition may help to reduce cardiac workload via reductions in BP and intravascular volume [37, 38]. Results from the ongoing CANVAS Program [39], including CANagliflozin cardioVascular Assessment Study (CANVAS; ClinicalTrials.gov Identifier: NCT01032629) and CANVAS-R (renal endpoints; NCT01989754) [40, 41], will provide evidence on the CV safety and efficacy of canagliflozin in more than 10,000 patients with CV disease history or CV risk factors upon completion in 2017 and will confirm whether the CV benefits observed with empagliflozin support a class effect. In addition, a separate study is underway to evaluate the effects of canagliflozin versus glimepiride in Japanese patients with T2DM and chronic heart failure [42].

Due to the post hoc nature of these analyses, the current study was limited by a lack of prespecified statistical testing across subgroups. However, calculated 95% CIs allowed for descriptive comparisons for treatment with both canagliflozin doses and placebo. Comparisons were also limited by the small number of patients with CV disease history at baseline, which was not surprising for this general population of patients with T2DM. Nevertheless, the subgroup analysis results were generally consistent with those seen in the overall pooled population [24]. Similar analyses using longer-term efficacy and safety data could provide additional insight into the durability of benefits and risks associated with canagliflozin based on CV disease history and CV risk factors.

Conclusions

Treatment with canagliflozin 100 and 300 mg provided consistent reductions in HbA1c, body weight, and systolic BP, and was generally well tolerated over 26 weeks of treatment in patients with T2DM, regardless of CV disease history or CV risk factors. These findings are noteworthy given the high burden of CV disease among patients with T2DM and the need for diabetes therapies that are safe and efficacious in patients with T2DM and CV disease.

Abbreviations

AE:

adverse event

AHA:

antihyperglycaemic agent

ANCOVA:

analysis of covariance

ATC:

Anatomical Therapeutic Chemical

BMI:

body mass index

BP:

blood pressure

CANA:

canagliflozin

CANVAS:

CANagliflozin cardioVascular Assessment Study

CI:

confidence interval

CV:

cardiovascular

eGFR:

estimated glomerular filtration rate

FPG:

fasting plasma glucose

HDL-C:

high-density lipoprotein cholesterol

LOCF:

last observation carried forward

LS:

least squares

MET:

metformin

mITT:

modified intent-to-treat

PBO:

placebo

PIO:

pioglitazone

SD:

standard deviation

SE:

standard error

SGLT2:

sodium glucose co-transporter 2

SU:

sulphonylurea

T2DM:

type 2 diabetes mellitus

UGE:

urinary glucose excretion

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Authors’ contributions

MJD, KM, and RQ contributed to the design and conduct of the study; participated in the acquisition, analysis, and interpretation of data; and drafted, reviewed, and approved the manuscript. UV and JY contributed to the analysis and interpretation of data and drafted, reviewed, and approved the manuscript. All authors read and approved the final manuscript.

Acknowledgements

Medical writing support was provided by Cherie Koch, PhD, of MedErgy, and was funded by Janssen Scientific Affairs, LLC.

Canagliflozin has been developed by Janssen Research & Development, LLC, in collaboration with Mitsubishi Tanabe Pharma Corporation.

Competing interests

MJD and KM are full-time employees of Janssen Scientific Affairs, LLC. UV, JY, and RQ are full-time employees of Janssen Research & Development, LLC.

Availability of data and materials

The datasets during and/or analysed during the current study are available from the corresponding author on reasonable request.

Ethics approval and consent to participate

All studies included in this post hoc analysis were performed in accordance with the Declaration of Helsinki, and study protocols and amendments were approved by appropriate ethics committees or institutional review boards. Specific details about the ethics approvals for each study are available upon request. Participants in all studies included in this analysis provided written informed consent prior to enrolment.

Funding

This analysis was supported by Janssen Scientific Affairs, LLC. The sponsor was involved in the design of the study; the collection, analysis, and interpretation of data; and writing the manuscript.

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Authors and Affiliations

  1. Janssen Scientific Affairs, LLC, 1125 Trenton-Harbourton Road, Titusville, NJ, 08560, USA

    Michael J. Davies & Katherine Merton

  2. Janssen Research & Development, LLC, 920 US Highway 202 South, Raritan, NJ, 08869, USA

    Ujjwala Vijapurkar, Jacqueline Yee & Rong Qiu

Authors
  1. Michael J. Davies
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  2. Katherine Merton
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  3. Ujjwala Vijapurkar
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  4. Jacqueline Yee
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  5. Rong Qiu
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Corresponding author

Correspondence to Michael J. Davies.

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Davies, M.J., Merton, K., Vijapurkar, U. et al. Efficacy and safety of canagliflozin in patients with type 2 diabetes based on history of cardiovascular disease or cardiovascular risk factors: a post hoc analysis of pooled data. Cardiovasc Diabetol 16, 40 (2017). https://doi.org/10.1186/s12933-017-0517-7

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  • DOI: https://doi.org/10.1186/s12933-017-0517-7

Keywords

Cardiovascular Diabetology

ISSN: 1475-2840