Investigators are building an empirical evidence base for real-world data through large-scale emulation of randomized controlled trials. The investigators' goal is to understand for what types of clinical questions real world data analyses can be conducted with confidence and how to implement such studies.
This is a non-randomized, non-interventional study that is part of the Randomized Controlled Trials Duplicated Using Prospective Longitudinal Insurance Claims: Applying Techniques of Epidemiology (RCT DUPLICATE) initiative (www.rctduplicate.org) of the Brigham and Women's Hospital, Harvard Medical School. It is intended to emulate, as closely as is possible in healthcare insurance claims data, the STEP-HFpEF DM trial described below. Although many features of the trial cannot be directly replicated in healthcare claims, key design features, including outcomes, exposures, and inclusion/exclusion criteria, were selected to proxy those features from the trial. In addition to closely emulating the trial population, this study also evaluates outcomes in a broader, less restrictive cohort to enhance generalizability to patients typically encountered in routine clinical practice. Randomization cannot be achieved in healthcare claims data but was proxied through a statistical balancing of measured covariates according to standard practice. Investigators assume that the RCT provides guidance on the reference standard treatment effect estimate. However, failure to replicate RCT findings is not necessarily indicative of the inadequacy of the healthcare claims data for emulation for a range of possible reasons, as the end points examined in the database study were only of exploratory nature in the trial. Moreover, divergence from these end points do not provide information on the validity of the original RCT finding. The STEP-HFpEF DM trial is a superiority trial that included an evaluation of the effect of semaglutide, a glucagon-like peptide-1 receptor agonist (GLP-1-RA), vs placebo on all-cause mortality or worsening heart failure events among individuals with heart failure with preserved ejection fraction. The database study designed to emulate STEP-HFpEF DM will be a new-user active-comparative study, conducted using 3 national United States claims databases, where we compare the effect of semaglutide vs sitagliptin, a dipeptidyl peptidase-4 inhibitor (DPP4i) on the composite end point of all-cause mortality or heart failure hospitalization. While the STEP-HFpEF DM trial compared semaglutide vs placebo, we chose to use sitagliptin as an active-comparator proxy for placebo. Sitagliptin was specifically chosen because a major randomized controlled trial on cardiovascular outcomes demonstrated that the drug does not affect the cardiovascular outcomes under investigation. Furthermore, clinical guidelines during the study period recommended both drug classes under investigation as second- or third-line options for glucose lowering and were similarly costly
Study Type
OBSERVATIONAL
Enrollment
58,387
New use of semaglutide dispensing claim is used as the exposure.
New use of sitagliptin dispensing claim is used as the reference (active-comparator proxy for placebo).
Brigham and Women's Hospital
Boston, Massachusetts, United States
Composite of all-cause mortality or heart failure hospitalization
To evaluate the effect of semgalutide vs placebo (sitaglitpin) on composite of all-cause mortality or heart failure hospitalization in two populations (1) patients meeting the eligibility criteria of the STEP-HFpEF DM trial, and (2) a broader patient population when relaxing the eligibility criteria of the STEP-HFpEF DM trial.
Time frame: Through study completion (1 day after cohort entry date until the first of outcome or censoring)
Composite of all-cause mortality or a worsening heart failure event (exacerbated symptoms of heart failure resulting in hospitalization, intravenous diuretic therapy in an urgent care setting), and its respective individual end points.
To evaluate the effect of semgalutide vs placebo (sitaglitpin) on composite of all-cause mortality or all-cause mortality or a worsening heart failure event (exacerbated symptoms of heart failure resulting in hospitalization, intravenous diuretic therapy in an urgent care setting) in two populations (1) patients meeting the eligibility criteria of the STEP-HFpEF DM trial, and (2) a broader patient population when relaxing the eligibility criteria of the STEP-HFpEF DM trial.
Time frame: Through study completion (1 day after cohort entry date until the first of outcome or censoring)
Worsening heart failure event (exacerbated symptoms of heart failure resulting in hospitalization or intravenous diuretic therapy in an urgent care setting)
To evaluate the effect of semgalutide vs placebo (sitaglitpin) on worsening heart failure event (exacerbated symptoms of heart failure resulting in hospitalization or intravenous diuretic therapy in an urgent care setting) in two populations (1) patients meeting the eligibility criteria of the STEP-HFpEF DM trial, and (2) a broader patient population when relaxing the eligibility criteria of the STEP-HFpEF DM trial.
Time frame: Through study completion (1 day after cohort entry date until the first of outcome or censoring)
Intravenous diuretic therapy in an urgent care setting
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To evaluate the effect of semgalutide vs placebo (sitaglitpin) on intravenous diuretic therapy in an urgent care setting in two populations (1) patients meeting the eligibility criteria of the STEP-HFpEF DM trial, and (2) a broader patient population when relaxing the eligibility criteria of the STEP-HFpEF DM trial.
Time frame: Through study completion (1 day after cohort entry date until the first of outcome or censoring)
Hospitalization for heart failure
To evaluate the effect of semgalutide vs placebo (sitaglitpin) on hospitalization for heart failure in two populations (1) patients meeting the eligibility criteria of the STEP-HFpEF DM trial, and (2) a broader patient population when relaxing the eligibility criteria of the STEP-HFpEF DM trial.
Time frame: Through study completion (1 day after cohort entry date until the first of outcome or censoring)
All-cause mortality
To evaluate the effect of semgalutide vs placebo (sitaglitpin) on all-cause mortality in two populations (1) patients meeting the eligibility criteria of the STEP-HFpEF DM trial, and (2) a broader patient population when relaxing the eligibility criteria of the STEP-HFpEF DM trial.
Time frame: Through study completion (1 day after cohort entry date until the first of outcome or censoring)
Urinary tract infection
To evaluate the effect of semgalutide vs placebo (sitaglitpin) on urinary tract infection in two populations (1) patients meeting the eligibility criteria of the STEP-HFpEF DM trial, and (2) a broader patient population when relaxing the eligibility criteria of the STEP-HFpEF DM trial.
Time frame: Through study completion (1 day after cohort entry date until the first of outcome or censoring)
Serious bacterial infection
To evaluate the effect of semgalutide vs placebo (sitaglitpin) on serious bacterial infection in two populations (1) patients meeting the eligibility criteria of the STEP-HFpEF DM trial, and (2) a broader patient population when relaxing the eligibility criteria of the STEP-HFpEF DM trial.
Time frame: Through study completion (1 day after cohort entry date until the first of outcome or censoring)
Gastrointestinal adverse events
To evaluate the effect of semaglutide vs placebo (sitagliptin) on gastrointestinal adverse events in two populations: (1) patients meeting the eligibility criteria of the STEP-HFpEF DM trial, and (2) a broader patient population when relaxing the eligibility criteria of the STEP-HFpEF DM trial.
Time frame: Through study completion (1 day after cohort entry date until the first of outcome or censoring)