Skip to content

A Study of Tirzepatide (LY3298176) in Participants With Heart Failure With Preserved Ejection Fraction (HFpEF) and Obesity: The SUMMIT Trial

A Randomized, Double-Blind, Placebo-Controlled, Phase 3 Study Comparing the Efficacy and Safety of Tirzepatide Versus Placebo in Patients With Heart Failure With Preserved Ejection Fraction and Obesity (SUMMIT)

Status
Completed
Phases
Phase 3
Study type
Interventional
Source
ClinicalTrials.gov
Registry ID
NCT04847557
Enrollment
731
Registered
2021-04-19
Start date
2021-04-20
Completion date
2024-07-02
Last updated
2025-08-20

For informational purposes only — not medical advice. Sourced from public registries and may not reflect the latest updates. Terms

Conditions

Heart Failure With Preserved Ejection Fraction (HFpEF), Obesity

Keywords

Heart Failure with Preserved Ejection Fraction (HFpEF)

Brief summary

The main purpose of this study is to assess the efficacy and safety of Tirzepatide (LY3298176) in participants with heart failure with preserved ejection fraction and obesity.

Detailed description

The study will continue until approximately 52 weeks after the last participant is randomized. The maximum duration of an individual's participation is estimated to be \ 120 weeks and will depend on duration of study enrollment.

Interventions

DRUGTirzepatide

Administered SC

OTHERPlacebo

Administered SC

Sponsors

Eli Lilly and Company
Lead SponsorINDUSTRY

Study design

Allocation
RANDOMIZED
Intervention model
PARALLEL
Primary purpose
TREATMENT
Masking
DOUBLE (Subject, Investigator)

Eligibility

Sex/Gender
ALL
Age
40 Years to No maximum
Healthy volunteers
No

Inclusion criteria

* Have a diagnosis of stable heart failure (NYHA class II-IV) and left ventricular ejection fraction (LVEF) ≥50% * Elevated NT-proBNP (N-terminal pro B-type natriuretic peptide) \> 200 picogram/milliliter (pg/ml) for participants without atrial fibrillation (AF), or \>600 pg/ml for participants with AF, Structural heart disease (Left atrial enlargement) or Elevated left ventricular filling pressure * Estimated glomerular filtration rate (eGFR) \<70 milliliter (ml)/minute (min)/1.73m² at screening, or HF decompensation within 12 months of screening, * Stable dose of heart failure medications within 4 weeks of screening * Body mass index (BMI) ≥30 kilograms per meter squared (kg/m²) * 6MWD 100-425 meters * KCCQ CSS ≤80

Exclusion criteria

* Have had a major cardiovascular event within the last 90 days of screening * Have had acute decompensated heart failure within 4 weeks of screening * Have non cardiac causes of functional impairment such as pulmonary arterial hypertension (PAH), severe chronic obstructive pulmonary disease (COPD), anemia, thyroid disease, musculoskeletal disease or orthopedic conditions * Presence of cardiac amyloidosis, cardiac accumulation disease, cardiomyopathy and severe valvular heart disease * HbA1c ≥9.5% or uncontrolled diabetes * History of proliferative diabetic retinopathy or diabetic maculopathy * Have a history of pancreatitis * eGFR \<15 mL/min/1.73 m² or requiring dialysis at screening

Design outcomes

Primary

MeasureTime frameDescription
Change From Baseline in the Kansas City Cardiomyopathy Questionnaire (KCCQ) Clinical Summary Score (CSS)Baseline, Week 52The KCCQ is a 23-item, participant self-administered questionnaire that assesses impacts of heart failure over the past 2 weeks on the following 7 domains: * Physical Limitation (6) * Symptom Stability (1) * Symptom Frequency (4) * Symptom Burden (3) * Self-Efficacy (2) * Quality of Life (3) * Social Limitation (4) Each of the 23 individual items are answered on Likert scales of varying lengths (5, 6, or 7-point scales). KCCQ-CSS includes the symptom and physical limitation domains of the KCCQ. Scores are obtained by averaging the associated individual items and transforming the score to a 0 to 100 range. Higher scores indicate better health status. Least Square (LS) mean was determined using ANCOVA model with Baseline + HF Decompensation Within 12 Months of Screening + T2DM Status + Baseline BMI group (\<35, \>=35 kg/m2) + Treatment (Type III sum of squares) as variables .
First Occurrence of the Composite Endpoint of Heart Failure (HF) OutcomesBaseline Up To 160 weeksClinical Endpoint Committe confirmed Occurrences of CV outcomes were reported here. HF outcomes consisted of cardiovascular death and HF events. The HF events were defined as worsening clinical symptoms or signs related to HF, which are meaningful to the participant and require intensification of treatment characterized by 1 or more of the following: * hospitalization for heart failure regardless of duration or treatment received * use of intravenous drug, usually an intravenous diuretic, but may include intravenous vasodilators or positive inotropic drugs, or * augmentation or increase in oral diuretic therapy.

Secondary

MeasureTime frameDescription
Percent Change From Baseline in High-Sensitivity C-Reactive Protein (hsCRP)Baseline, Week 52Percent change from baseline in hsCRP was reported. LS Mean was determined using ANCOVA model with log (actual measurement/baseline) = log (baseline) + HF decompensation within 12 months of screening + T2DM status + baseline BMI group (\<35, \>=35 kg/m2) + Treatment (Type III sum of squares) as variables.
Win Percentage of the Hierarchical Composite EndpointBaseline Up To 160 WeeksHierarchical Composite Endpoint included time to all-cause death, number of HF events, time to first HF events, KCCQ-CSS, 6MWD. The winner was determined in each pair-wise comparison in the following order: * A delayed first occurrence of all-cause death * If the pair cannot be differentiated based on death, winner has fewer HF events * If the pair cannot be differentiated by number of HF events, winner has delayed time to occurrence of first HF event * If the pair still cannot be differentiated, winner has a more favorable category for change from baseline in 6MWD * If the pair still cannot be differentiated, winner has a more favorable category for change from baseline in KCCQ-CSS * Otherwise the pair will be recorded as tied. Reported unit is the total percent of wins for each treatment group from performing such a hierarchical comparison across stratification factors in the study.
Percentage of Participants With New York Heart Association (NYHA) Class ChangeWeek 52Percentage of participants with NYHA class change at Week 52 was reported.
Change From Baseline in Exercise Capacity as Measured by 6-Minute Walk Distance (6MWD)Baseline, Week 52Participants performed an exercise capacity assessment using the 6-Minute Walk Test (6MWT) and the distance covered (6MWD) was assessed in meters. The 6MWT was performed indoors on a straight, flat, hard surface that is at least 30 meters in length. The greater distance walked meant better physical capacity. LS Mean was determined using ANCOVA model with Baseline + HF Decompensation Within 12 Months of Screening + T2DM Status + Baseline BMI group (\<35, \>=35 kg/m2) + Treatment (Type III sum of squares) as variables.
Number of Participants With Time to First Occurrence of HF EventsBaseline Up To 160 WeeksNumber of participants with time to first occurrence of HF events are reported.
Number of HF Events and All-Cause DeathBaseline Up To 160 Weeks.Number of HF events and all-cause death are reported.
Number of Recurrent HF EventsBaseline Up To 160 Weeks.Number of recurrent HF events were reported.
Number of Participants With Time to All-Cause DeathBaseline Up To 160 WeeksAll-cause mortality is death due to any cause. Number of participants with time to all-cause mortality are presented.
Percent Change From Baseline in Body WeightBaseline, Week 52Percent change in bodyweight was reported. LS mean was determined using ANCOVA model with Baseline + HF Decompensation Within 12 Months of Screening + T2DM Status + Baseline BMI group (\<35, \>=35 kg/m2) + Treatment (Type III sum of squares) as variables.

Countries

Argentina, Brazil, China, India, Israel, Mexico, Puerto Rico, Russia, Taiwan, United States

Participant flow

Participants by arm

ArmCount
Tirzepatide - MTD
Participants received a starting dose of 2.5 mg tirzepatide administered SC QW and escalated by 2.5 mg every 4 weeks to a maximum of 15 mg QW or MTD tolerated by the participant (5 mg QW or 10 mg QW).
364
Placebo
Participants received placebo administered SC QW.
367
Total731

Withdrawals & dropouts

PeriodReasonFG000FG001
Overall StudyAdverse Event10
Overall StudyDeath1915
Overall StudyLost to Follow-up36
Overall StudyPhysician Decision10
Overall StudyProtocol Violation01
Overall StudyWithdrawal by Subject814

Baseline characteristics

CharacteristicTirzepatide - MTDTotalPlacebo
Age, Continuous65.50 years
STANDARD_DEVIATION 10.53
65.20 years
STANDARD_DEVIATION 10.7
65.00 years
STANDARD_DEVIATION 10.87
Ethnicity (NIH/OMB)
Hispanic or Latino
195 Participants400 Participants205 Participants
Ethnicity (NIH/OMB)
Not Hispanic or Latino
164 Participants323 Participants159 Participants
Ethnicity (NIH/OMB)
Unknown or Not Reported
5 Participants8 Participants3 Participants
Race (NIH/OMB)
American Indian or Alaska Native
24 Participants47 Participants23 Participants
Race (NIH/OMB)
Asian
58 Participants131 Participants73 Participants
Race (NIH/OMB)
Black or African American
22 Participants36 Participants14 Participants
Race (NIH/OMB)
More than one race
2 Participants2 Participants0 Participants
Race (NIH/OMB)
Native Hawaiian or Other Pacific Islander
2 Participants3 Participants1 Participants
Race (NIH/OMB)
Unknown or Not Reported
0 Participants0 Participants0 Participants
Race (NIH/OMB)
White
256 Participants512 Participants256 Participants
Region of Enrollment
Argentina
101 Participants204 Participants103 Participants
Region of Enrollment
Brazil
51 Participants105 Participants54 Participants
Region of Enrollment
China
25 Participants55 Participants30 Participants
Region of Enrollment
India
9 Participants20 Participants11 Participants
Region of Enrollment
Israel
17 Participants38 Participants21 Participants
Region of Enrollment
Mexico
41 Participants81 Participants40 Participants
Region of Enrollment
Russia
13 Participants21 Participants8 Participants
Region of Enrollment
Taiwan
24 Participants56 Participants32 Participants
Region of Enrollment
United States
83 Participants151 Participants68 Participants
Sex: Female, Male
Female
200 Participants393 Participants193 Participants
Sex: Female, Male
Male
164 Participants338 Participants174 Participants

Adverse events

Event typeEG000
affected / at risk
EG001
affected / at risk
deaths
Total, all-cause mortality
19 / 36415 / 367
other
Total, other adverse events
221 / 364137 / 367
serious
Total, serious adverse events
96 / 36494 / 367

Outcome results

Primary

Change From Baseline in the Kansas City Cardiomyopathy Questionnaire (KCCQ) Clinical Summary Score (CSS)

The KCCQ is a 23-item, participant self-administered questionnaire that assesses impacts of heart failure over the past 2 weeks on the following 7 domains: * Physical Limitation (6) * Symptom Stability (1) * Symptom Frequency (4) * Symptom Burden (3) * Self-Efficacy (2) * Quality of Life (3) * Social Limitation (4) Each of the 23 individual items are answered on Likert scales of varying lengths (5, 6, or 7-point scales). KCCQ-CSS includes the symptom and physical limitation domains of the KCCQ. Scores are obtained by averaging the associated individual items and transforming the score to a 0 to 100 range. Higher scores indicate better health status. Least Square (LS) mean was determined using ANCOVA model with Baseline + HF Decompensation Within 12 Months of Screening + T2DM Status + Baseline BMI group (\<35, \>=35 kg/m2) + Treatment (Type III sum of squares) as variables .

Time frame: Baseline, Week 52

Population: All participants who received at least one dose of study drug and had evaluable data for this outcome.

ArmMeasureValue (LEAST_SQUARES_MEAN)Dispersion
Tirzepatide - MTDChange From Baseline in the Kansas City Cardiomyopathy Questionnaire (KCCQ) Clinical Summary Score (CSS)19.51 Score on a scaleStandard Error 1.24
PlaceboChange From Baseline in the Kansas City Cardiomyopathy Questionnaire (KCCQ) Clinical Summary Score (CSS)12.68 Score on a scaleStandard Error 1.25
p-value: <0.00195% CI: [3.3, 10.6]Stratified Wilcoxon
Primary

First Occurrence of the Composite Endpoint of Heart Failure (HF) Outcomes

Clinical Endpoint Committe confirmed Occurrences of CV outcomes were reported here. HF outcomes consisted of cardiovascular death and HF events. The HF events were defined as worsening clinical symptoms or signs related to HF, which are meaningful to the participant and require intensification of treatment characterized by 1 or more of the following: * hospitalization for heart failure regardless of duration or treatment received * use of intravenous drug, usually an intravenous diuretic, but may include intravenous vasodilators or positive inotropic drugs, or * augmentation or increase in oral diuretic therapy.

Time frame: Baseline Up To 160 weeks

Population: All participants who received at least one dose of study drug.

ArmMeasureValue (NUMBER)
Tirzepatide - MTDFirst Occurrence of the Composite Endpoint of Heart Failure (HF) Outcomes36 Number of events
PlaceboFirst Occurrence of the Composite Endpoint of Heart Failure (HF) Outcomes56 Number of events
Comparison: Heart Failure Outcomesp-value: 0.02695% CI: [0.41, 0.95]Regression, Cox
Secondary

Change From Baseline in Exercise Capacity as Measured by 6-Minute Walk Distance (6MWD)

Participants performed an exercise capacity assessment using the 6-Minute Walk Test (6MWT) and the distance covered (6MWD) was assessed in meters. The 6MWT was performed indoors on a straight, flat, hard surface that is at least 30 meters in length. The greater distance walked meant better physical capacity. LS Mean was determined using ANCOVA model with Baseline + HF Decompensation Within 12 Months of Screening + T2DM Status + Baseline BMI group (\<35, \>=35 kg/m2) + Treatment (Type III sum of squares) as variables.

Time frame: Baseline, Week 52

Population: All participants who received at least one dose of study drug and had evaluable data for this outcome,

ArmMeasureValue (LEAST_SQUARES_MEAN)Dispersion
Tirzepatide - MTDChange From Baseline in Exercise Capacity as Measured by 6-Minute Walk Distance (6MWD)26.04 metersStandard Error 3.81
PlaceboChange From Baseline in Exercise Capacity as Measured by 6-Minute Walk Distance (6MWD)10.10 metersStandard Error 3.94
p-value: <0.00195% CI: [9.9, 26.7]Stratified Wilcoxon
Secondary

Number of HF Events and All-Cause Death

Number of HF events and all-cause death are reported.

Time frame: Baseline Up To 160 Weeks.

Population: All participants who received at least one dose of study drug.

ArmMeasureValue (NUMBER)
Tirzepatide - MTDNumber of HF Events and All-Cause Death61 Events
PlaceboNumber of HF Events and All-Cause Death82 Events
95% CI: [0.46, 1.14]
Secondary

Number of Participants With Time to All-Cause Death

All-cause mortality is death due to any cause. Number of participants with time to all-cause mortality are presented.

Time frame: Baseline Up To 160 Weeks

Population: All participants who received at least one dose of study drug.

ArmMeasureValue (COUNT_OF_PARTICIPANTS)
Tirzepatide - MTDNumber of Participants With Time to All-Cause Death19 Participants
PlaceboNumber of Participants With Time to All-Cause Death15 Participants
95% CI: [0.633, 2.452]
Secondary

Number of Participants With Time to First Occurrence of HF Events

Number of participants with time to first occurrence of HF events are reported.

Time frame: Baseline Up To 160 Weeks

Population: All participants who received at least one dose of study drug.

ArmMeasureValue (COUNT_OF_PARTICIPANTS)
Tirzepatide - MTDNumber of Participants With Time to First Occurrence of HF Events29 Participants
PlaceboNumber of Participants With Time to First Occurrence of HF Events52 Participants
95% CI: [0.342, 0.85]
Secondary

Number of Recurrent HF Events

Number of recurrent HF events were reported.

Time frame: Baseline Up To 160 Weeks.

Population: All participants who received at least one dose of study drug.

ArmMeasureValue (NUMBER)
Tirzepatide - MTDNumber of Recurrent HF Events44 Events
PlaceboNumber of Recurrent HF Events68 Events
95% CI: [0.37, 1.05]
Secondary

Percentage of Participants With New York Heart Association (NYHA) Class Change

Percentage of participants with NYHA class change at Week 52 was reported.

Time frame: Week 52

Population: All participant who received at least one dose of study drug and had evaluable data for this outcome.

ArmMeasureValue (NUMBER)
Tirzepatide - MTDPercentage of Participants With New York Heart Association (NYHA) Class Change33.27 Percentage of participants
PlaceboPercentage of Participants With New York Heart Association (NYHA) Class Change20.39 Percentage of participants
95% CI: [1.53, 3.4]
Secondary

Percent Change From Baseline in Body Weight

Percent change in bodyweight was reported. LS mean was determined using ANCOVA model with Baseline + HF Decompensation Within 12 Months of Screening + T2DM Status + Baseline BMI group (\<35, \>=35 kg/m2) + Treatment (Type III sum of squares) as variables.

Time frame: Baseline, Week 52

Population: All participants who received at least one dose of study drug and had evaluable data for this outcome.

ArmMeasureValue (LEAST_SQUARES_MEAN)Dispersion
Tirzepatide - MTDPercent Change From Baseline in Body Weight-13.85 Percent changeStandard Error 0.43
PlaceboPercent Change From Baseline in Body Weight-2.24 Percent changeStandard Error 0.46
p-value: <0.00195% CI: [-12.85, -10.38]ANCOVA
Secondary

Percent Change From Baseline in High-Sensitivity C-Reactive Protein (hsCRP)

Percent change from baseline in hsCRP was reported. LS Mean was determined using ANCOVA model with log (actual measurement/baseline) = log (baseline) + HF decompensation within 12 months of screening + T2DM status + baseline BMI group (\<35, \>=35 kg/m2) + Treatment (Type III sum of squares) as variables.

Time frame: Baseline, Week 52

Population: All participants who received at least one dose of study drug and had evaluable data for this outcome.

ArmMeasureValue (LEAST_SQUARES_MEAN)Dispersion
Tirzepatide - MTDPercent Change From Baseline in High-Sensitivity C-Reactive Protein (hsCRP)-38.76 Percent changeStandard Error 4.47
PlaceboPercent Change From Baseline in High-Sensitivity C-Reactive Protein (hsCRP)-5.88 Percent changeStandard Error 5.25
p-value: <0.00195% CI: [-45.6, -22.17]ANCOVA
Secondary

Win Percentage of the Hierarchical Composite Endpoint

Hierarchical Composite Endpoint included time to all-cause death, number of HF events, time to first HF events, KCCQ-CSS, 6MWD. The winner was determined in each pair-wise comparison in the following order: * A delayed first occurrence of all-cause death * If the pair cannot be differentiated based on death, winner has fewer HF events * If the pair cannot be differentiated by number of HF events, winner has delayed time to occurrence of first HF event * If the pair still cannot be differentiated, winner has a more favorable category for change from baseline in 6MWD * If the pair still cannot be differentiated, winner has a more favorable category for change from baseline in KCCQ-CSS * Otherwise the pair will be recorded as tied. Reported unit is the total percent of wins for each treatment group from performing such a hierarchical comparison across stratification factors in the study.

Time frame: Baseline Up To 160 Weeks

Population: All participants who received at least one dose of study drug.

ArmMeasureValue (NUMBER)
Tirzepatide - MTDWin Percentage of the Hierarchical Composite Endpoint57.90 Win percentage
PlaceboWin Percentage of the Hierarchical Composite Endpoint35.43 Win percentage
95% CI: [1.17, 2.28]

Source: ClinicalTrials.gov · Data processed: Jul 9, 2026