First-Ever Cost-Effectiveness Analysis of a Factor XI Inhibitor Demonstrates that Abelacimab, if Approved, Could Offer Significant Cost Savings as Compared to a Current Standard of Care Anticoagulant
Treatment with abelacimab could result in potential cost-savings of $50,000 over a lifetime per patient basis and higher quality-adjusted life years in atrial fibrillation patients at a high risk of stroke versus rivaroxaban
Cost-effectiveness analysis based upon the results from the landmark AZALEA-TIMI 71 study which was stopped early by the Data Monitoring Committee (DMC) due to a substantially greater than anticipated reduction in major and clinically relevant non-major bleeds in the abelacimab arms compared to rivaroxaban
Abelacimab is an investigational, once-monthly, highly selective, fully human monoclonal antibody that achieves a near complete 99% Inhibition of Factor XI
CAMBRIDGE, Mass., May 6, 2024 – Results of the first-ever cost-effectiveness study of a Factor XI inhibitor were presented today during sessions of the Professional Society for Health Economics and Outcomes Research (ISPOR) annual meeting. The analysis indicates that abelacimab could offer a potential cost-savings of $50,000 USD and improvements of 1.5 quality-adjusted life years (QALY’s) per person over a lifetime horizon as compared to rivaroxaban, a commonly used direct oral anticoagulant (DOAC). If approved by US regulatory authorities, abelacimab could be a highly cost-effective anticoagulant option. “The objective of our economic analysis was to explore the potential cost-effectiveness of abelacimab versus rivaroxaban, using the results from the AZALEA-TIMI 71 study that were presented during a late- breaking session at the 2023 American Heart Association Scientific Sessions,” explained Josephine Li- McLeod, RPh, PhD, at Stratevi, an independent health economics and outcomes research consulting firm, who developed the modeling and led the assessment. “The results from this early economic analysis clearly indicate that abelacimab was dominant versus rivaroxaban with significant savings and a greater number of quality-adjusted life years, meaning it could be a very cost-effective anticoagulant option for patients with atrial fibrillation at moderate-to-high risk of stroke.”
Despite the effectiveness of current anticoagulants in stroke prevention, concerns about bleeding risk for patients taking anticoagulants persist. So much so that the underuse of anticoagulants in patients with atrial fibrillation (AF) at risk for stroke is one of the greatest public health issues facing cardiovascular patients.1
“The reality is too many patients with atrial fibrillation are either not taking an anticoagulant at all, or are using a sub-therapeutic dose, typically due to the risk or fear of bleeding associated with currently available therapies. The great promise of a factor XI inhibitor such as abelacimab, rests largely with the ability to prevent thrombosis with minimal disruption of hemostasis. In doing so, this class could represent a major paradigm shift in how we best manage patients in the future,” said Dan Bloomfield, MD, Chief Medical Officer at Anthos Therapeutics. “The significantly improved bleeding profile favoring abelacimab as seen in the AZALEA-TIMI 71 study, coupled with the results from this new cost- effectiveness analysis means that, if approved, patients may have a safer, cost-saving treatment alternative as compared to a standard of care direct-oral anticoagulant.”
About Abelacimab
Abelacimab is a novel, dual-acting, once-monthly-administered fully human investigational monoclonal antibody that binds to FXI preventing its activation and also neutralizes FXIa activity.2
As a monoclonal antibody, abelacimab is not metabolized via the cytochrome P450 system or as a substrate for P-glycoprotein, meaning the risk of drug-drug interactions is very low. There is no need to adjust the dose based on age or renal/hepatic status.
Factor XI inhibition offers the promise of hemostasis-sparing anticoagulation for the prevention and treatment of arterial and venous thromboembolic events.3 Abelacimab is the only Factor XI inhibitor being studied for both conditions.
In patients with atrial fibrillation, abelacimab is planned to be dosed subcutaneously (SC) monthly to maintain near-complete inhibition in a chronic setting. It is also planned to be administered via an initial intravenous (IV) infusion for acute indications requiring immediate onset of action and then followed by subsequent monthly SC administration.
In the AZALEA-TIMI 71 study, abelacimab 150 mg dosed subcutaneously once-monthly, inhibited Factor XI by 99%. 3 In a PK / PD study, abelacimab administered IV provided profound suppression of Factor XI within one hour after the start of therapy and maintained near maximal inhibition for up to 30 days.4 In a Phase 2 study published in the New England Journal of Medicine in 2021, a single intravenous dose of abelacimab after knee surgery reduced the rate of venous thromboembolism by 80%, measured 10 days after surgery, compared to enoxaparin.5
Abelacimab received a Fast Track Designation from the FDA in July 2022 for the treatment of thrombosis associated with cancer. In September 2022, abelacimab was also granted a Fast Track Designation for the prevention of stroke and systemic embolism in patients with atrial fibrillation.
Abelacimab is an investigational agent and is not approved for any indication in any country.
About the Cost-Effectiveness Model
A previously developed Markov state-transition cohort model reflecting the clinical pathways typical of people with AF at moderate-to-high risk of stroke was revised to assess the cost-effectiveness of abelacimab versus rivaroxaban from the US payer perspective.6,7
Clinical inputs were derived from prior models and the AZALEA-TIMI 71 trial.6,7,8 In scenario analyses, the value-based price of abelacimab was explored at various willingness-to-pay (WTP) thresholds using the 95% confidence interval (CI) of the primary bleeding endpoint from AZALEA-TIMI 71.
Cost and utility estimates were derived from literature and publicly available sources. Because AZALEA- TIMI 71 was a safety study, the model assumed no difference in the risk of stroke or MI between abelacimab and rivaroxaban.8
The model used a 3-month cycle length and a lifetime horizon. All costs were inflation-adjusted to 2023 US dollars (USD). Following economic model guidelines, a 3% annual discount rate was applied to both cost and utilities.9 All model parameters were varied ±20% in one-way sensitivity analyses to evaluate cost-effectiveness sensitivity.
About the AZALEA-TIMI 71 Study
The AZALEA-TIMI 71 study was an event-driven, randomized, active-controlled, blinded endpoint, parallel-group study with a primary endpoint that evaluated the effect of two blinded doses of abelacimab relative to open-label rivaroxaban in patients with atrial fibrillation (AF) who are at moderate-to-high risk of stroke. The primary endpoint of the AZALEA-TIMI 71 study was the composite of the rate of major or clinically relevant non-major bleeding events. A secondary endpoint was major bleeding on its own. Patients were randomized 1:1:1 and administered subcutaneous (SC) abelacimab 150 mg once-monthly, abelacimab 90 mg once-monthly, or rivaroxaban 20 mg daily.
With a median follow-up of 21 months, spanning more than 2,000 patient-years, the AZALEA-TIMI 71 study is the largest and longest head-to-head study of a Factor XI inhibitor to provide definitive evidence of a highly significant reduction in bleeding as compared to a standard-of-care anticoagulant.
Summary of Results as Presented During the American Heart Association 2023 Scientific Sessions:8
- Primary endpoint met with a 67% reduction in major or clinically relevant non-major bleeding (CRNM) with abelacimab 150 mg compared with rivaroxaban 20 mg in patients with atrial fibrillation who are at moderate-to-high risk of stroke (P<0.001, HR 0.33, 95% Cl 0.19–0.55)
- 74% reduction in major bleeding alone with abelacimab 150 mg vs rivaroxaban 20 mg (P=0.002, HR 0.26, 95% CI 0.11-0.61)
- 93% reduction in gastrointestinal (GI) bleeding with abelacimab 150 mg vs rivaroxaban 20 mg (P=0.008, HR 0.07, 95% Cl 0.01-0.50)
- 51% reduction in net clinical outcome with abelacimab 150 mg vs rivaroxaban 20 mg (P<0.001, HR 0.49, 95% CI 0.33-0.71)
- Factor XI inhibition of ~99% with abelacimab 150 mg dosed once monthly
The AZALEA-TIMI 71 study enrolled 1,287 patients across 95 global study sites including the U.S. and Canada, Europe and Asia. The independent data monitoring committee (IDMC) recommended that the study end early because of a substantially greater than anticipated reduction in major and clinically relevant non-major bleeding in the abelacimab arms compared to rivaroxaban and a benefit:risk ratio that favored abelacimab. At the same time, the IDMC also recommend that an optional open-label extension period should be made available.
AZALEA-TIMI 71 Open-Label Extension
An optional extension period in order to provide longer-term data was included as part of the AZALEA- TIMI 71 study protocol. It could be initiated if the independent data monitoring committee (IDMC) stopped the study early due to an imbalance of bleeding substantially favoring abelacimab over rivaroxaban, and the benefit:risk clearly favored abelacimab. Investigative sites had the option of participating or not participating in the extension period. Patients who completed the end-of-treatment visit on study treatment and met the eligibility criteria for the extension period had the option to participate or not.
About Atrial Fibrillation
Also known as AF, or AFib, atrial fibrillation is an irregular heartbeat, or arrhythmia that can lead to blood clots, is a preventable cause of stroke, and a leading cause of long term disability and mortality.10,11 Approximately 37 million people worldwide are currently diagnosed with atrial fibrillation,12 while in the United States, the Centers for Disease Control and Prevention (CDC) estimates that more than 12 million Americans will develop AF by 2030.13 The goal of anticoagulation therapy is to prevent and/or treat thrombosis with minimal disruption of hemostasis. Despite the effectiveness of current anticoagulants in stroke prevention, concerns about bleeding risk persist. The underuse of stroke prevention in patients with AF at risk for stroke is one of the greatest public health issues facing cardiovascular patients.1
About Anthos Therapeutics
Anthos Therapeutics was founded by Blackstone Life Sciences in 2019 and obtained from Novartis Pharma AG the exclusive global rights to develop, manufacture, and commercialize abelacimab. Anthos Therapeutics is a clinical-stage biopharmaceutical company focused on the development and commercialization of genetically and pharmacologically validated innovative therapies to advance care for high-risk cardiovascular patients. For more information, visit the Company’s website and follow on Twitter and LinkedIn.
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