Study of Surgical Practices in Hemophilia A Patients Treated With Efanesoctocog Alfa (Altuvoct®) (CHALE II)

July 20, 2026 updated by: Hospices Civils de Lyon

Hemophilia A is an inherited bleeding disorder caused by the absence or deficiency of coagulation factor VIII. The perioperative management of individuals with hemophilia A involves replacement therapies, typically through bolus or continuous infusions of Factor VIII, to ensure effective hemostatic control during surgery.

Efanesoctocog alfa represents a significant advance in treatment. It is a highly engineered, VWF-independent, recombinant FVIII fusion molecule with an ultra-long half-life of 47 hours in adults and 40 hours in children. Efanesoctocog alfa is approved in the U.S. and Germany for adults and children with hemophilia A for multiple purposes: routine prophylaxis to reduce bleeding episodes, on-demand treatment of bleeding episodes, and perioperative management. Despite its approval, the precise optimal use of efanesoctocog alfa in the surgical setting remains underexplored. Further research is essential to define its specific benefits in surgery, thereby enhancing its clinical utility and informing treatment protocols.

The objective of this cohort study is to collect clinical data on the surgical management of patients with hemophilia A treated with Altuvoct® in a real-world setting. Data collected will include surgical context (outpatient or inpatient), number of FVIII infusions during the perioperative period, length of hospital stay, postoperative date of return to usual prophylaxis, and factor VIII use. The results will be compared with those obtained using efmoroctocog (Elocta) in the ongoing CHALE study in France.

The multicenter design is critical due to the rarity of hemophilia A, the diversity of surgical procedures, and the need to enroll a sufficient number of patients. The management of patients with hemophilia A during and after surgery is inherently multidisciplinary and requires careful coordination and adherence to numerous requirements. Given the variability in practice among centers, this study aims to support secondary harmonization of protocols and minimize intercenter variability. Such efforts are in line with the missions assigned to the National Reference Center for Hemophilia in France, coordinated by Pr Dargaud, and emphasize the importance of optimizing and standardizing care practices.

A similar study is currently underway in France with efmoroctocog alfa (Elocta), which has already included over 155 procedures under real-world conditions. Using a similar case report form (CRF) for the present study will enable a direct comparison of surgical outcomes between extended half-life and ultra-extended half-life FVIII treatments, providing deeper insight into their respective roles in perioperative care. Additionally, this approach will highlight the added value of efanesoctocog alfa compared to existing therapies.

Another key advantage of this research is the opportunity to compare outcomes in patients receiving combined therapy with efanesoctocog alfa and emicizumab. Since the ongoing CHALE study has already included patients treated with both efmoroctocog and emicizumab, this comparison will further enhance our understanding of combination treatment strategies.

Study Overview

Status

Recruiting

Conditions

Intervention / Treatment

Study Type

Observational

Enrollment (Estimated)

160

Contacts and Locations

This section provides the contact details for those conducting the study, and information on where this study is being conducted.

Study Locations

  • France
      • Bron, France, 69500
        • Recruiting
        • Unité d'Hémostase Clinique Centre Régional de Traitement des Hémophiles Centre de Référence de Maladies Hémorragiques Hôpital Cardiologique Louis Pradel
        • Contact:

Participation Criteria

Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.

Eligibility Criteria

Ages Eligible for Study

  • Child
  • Adult
  • Older Adult

Accepts Healthy Volunteers

No

Sampling Method

Non-Probability Sample

Study Population

This study includes adult and pediatric patients with Hemophilia A undergoing surgical procedures.

Description

Inclusion Criteria:

  • Hemophilia A
  • Surgery performed with Altuvoct®
  • Patient consent to participate after receiving detailed written information.

Exclusion Criteria:

  • Presence of any blood coagulation disorder other than hemophilia A.
  • Detectable factor VIII inhibitors.
  • Known severe liver disease.
  • Known severe kidney disease.
  • Known hypersensitivity to Altuvoct® or any of its excipients.
  • Participation in another clinical trial (participation in non-interventional studies is not an exclusion criterion).

Study Plan

This section provides details of the study plan, including how the study is designed and what the study is measuring.

How is the study designed?

Design Details

Cohorts and Interventions

Group / Cohort
Intervention / Treatment
Major surgeries
  • 40 with efanesoctocog alfa
  • 40 with efanesoctocog alfa and emicizumab
Other: Clinical Data
Clinical Data

What is the study measuring?

Primary Outcome Measures

Outcome Measure
Measure Description
Time Frame
Perioperative Altuvoct® Utilization for Hemostatic Management
Time Frame: From the preoperative dose through the end of the perioperative period (up to postoperative day 14)
The number, frequency, and dose per injection of Altuvoct® required to maintain hemostasis during the perioperative period, analyzed both in total and stratified by surgery type (major or minor) and location. These results will be compared to those obtained with efmoroctocog alfa (Elocta) in the ongoing CHALE study.
From the preoperative dose through the end of the perioperative period (up to postoperative day 14)

Collaborators and Investigators

This is where you will find people and organizations involved with this study.

Sponsor

Hospices Civils de Lyon

Study record dates

These dates track the progress of study record and summary results submissions to ClinicalTrials.gov. Study records and reported results are reviewed by the National Library of Medicine (NLM) to make sure they meet specific quality control standards before being posted on the public website.

Study Major Dates

Study Start (Actual)

January 3, 2026

Primary Completion (Actual)

March 1, 2026

Study Completion (Estimated)

October 1, 2028

Study Registration Dates

First Submitted

July 20, 2026

First Submitted That Met QC Criteria

July 20, 2026

First Posted (Actual)

July 23, 2026

Study Record Updates

Last Update Posted (Actual)

July 23, 2026

Last Update Submitted That Met QC Criteria

July 20, 2026

Last Verified

March 1, 2026

More Information

Terms related to this study

Keywords

Additional Relevant MeSH Terms

Other Study ID Numbers

  • 25-5467

Drug and device information, study documents

Studies a U.S. FDA-regulated drug product

No

Studies a U.S. FDA-regulated device product

No

This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.

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