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ATHN 8: Previously Untreated Patients (PUPs) Matter Study

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ClinicalTrials.gov Identifier: NCT03818529
Recruitment Status : Recruiting
First Posted : January 28, 2019
Last Update Posted : September 5, 2021
CSL Behring
Information provided by (Responsible Party):
American Thrombosis and Hemostasis Network

Brief Summary:
This is a multi-center cohort study of approximately 250 previously untreated patients (PUPs) with congenital moderate to severe hemophilia A or B in a network of up to 50 US Hemophilia Treatment Centers (HTCs). Participants will be followed as they receive their first 50 exposure days (ED) to clotting factor replacement product, both prospectively and retrospectively. The data collected on evolving treatment practices will define the incidence and risk factors for inhibitor development during the high risk period of first 50 ED and improve the outcomes of this vulnerable population.

Condition or disease
Hemophilia Hemophilia A Hemophilia B Hemophilia A With Inhibitor Hemophilia B With Inhibitor Haemophilia B Without Inhibitor Haemophilia A Without Inhibitor Haemophilia

Detailed Description:

This multi-center, longitudinal, observational, prospective and retrospective study of previously untreated patients (PUPs) with moderate to severe hemophilia A or B during the initial 50 exposure days (ED) to clotting factor replacement product or until the development of a confirmed inhibitor. The Primary Investigators have designed the study to utilize the American Thrombosis and Hemostasis Network (ATHN) electronic infrastructure to leverage existing data and enable the collection of more in-depth clinical and laboratory data on PUPs. The study aligns with the National Hemophilia Foundation Medical and Scientific Advisory Council (MASAC) recently issued Recommendation #243 which includes: "Regardless of which option is chosen, all PUPs should be enrolled in the ATHN data collection system or a clinical trial to assess outcomes." Co-enrollment in the ATHNdataset by participants is required. The total study duration is planned for 6 years.

The primary objective is to determine the percentage of patients with confirmed inhibitors within the first 50 ED. Confirmed inhibitors are defined as two consecutive positive inhibitor titers (per CDC laboratory criteria; >0.5 Nijmegen Bethesda Units for hemophilia A and >0.3 Nijmegen Bethesda Units for hemophilia B) on different blood samples which result in change in treatment recommendations.

Please note - the treatment regimen will be at the discretion of the participants' hemophilia caregivers. No treatment products are being provided by the study nor will the participants be paid. However, inhibitor titer testing will be provided at no cost to participants by the Centers for Disease Control and Prevention (CDC).

All study procedures and follow-up will be timed to coincide with scheduled hemophilia care whenever possible. Ad hoc, quarterly follow-up, annual and final visits are for participants who have not met study endpoints (50 ED or inhibitor development) prior to enrollment.

Data collected will include eligibility, demographics, medical history (co-morbidities, surgery/procedures, immunizations and allergies), hemophilia history (severity, genotype and family history), birth history, inhibitor testing results, detailed treatment product(s) usage, bleeding events, bleeding disorder related medical visits during the study, and EUHASS adverse events.


A number of sub-studies are planned with pharmaceutical sponsors to collect information from patients about their specific product use. Participation in these product specific sub-studies is optional and sub-study visits will be planned to coincide with HTC visits. The sub-study will collect information from patients about their perception and use of treatment products, physical activity levels and other general health questions. This data will be collected via questionnaire.

Data Collection System

All data collected will be entered into electronic case report forms (eCRFs) within the secure ATHN System by HTC site personnel. All participating study sites will have in place a current, executed Data Use and Business Associate Agreement (DUBAA) with ATHN.

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Study Type : Observational
Estimated Enrollment : 250 participants
Observational Model: Cohort
Time Perspective: Other
Official Title: US Cohort Study of Previously Untreated Patients (PUPs) With Congenital Hemophilia
Actual Study Start Date : October 3, 2018
Estimated Primary Completion Date : March 2023
Estimated Study Completion Date : December 2023

Resource links provided by the National Library of Medicine

Primary Outcome Measures :
  1. Determine percentage of patients with confirmed inhibitors [ Time Frame: 6 years ]
    Participants will be followed to assess inhibitor development (per CDC laboratory criteria; >0.5 Nijmegen Bethesda Units for hemophilia A and >0.3 Nijmegen Bethesda Units for hemophilia B) within 50 exposure days. Blood specimens will be submitted to the CDC for inhibitor testing at various time points outlined in the protocol.

Secondary Outcome Measures :
  1. Determine risk factors including genetic variants associated with inhibitor development in PUPs [ Time Frame: 6 years ]
    The study will provide a systematic approach to data collection by using the ATHN System to provide database infrastructure and data collection methods to evaluate determinants of inhibitor formation.

  2. Determine percentage of eligible participants enrolled at each site [ Time Frame: 6 years ]
    Sites will report number of eligible participants and number of participants enrolled to determine the percentage of enrollment.

  3. Determine mean age of diagnosis and first exposure to factor treatment product [ Time Frame: 6 years ]
    Sites will document the date of diagnosis and the date of first exposure to clotting factor treatment product.

  4. Determine the number of exposure days prior to inhibitor development [ Time Frame: 6 years ]
    Sites and participants will work together to provide detailed records of exposure days to clotting factor replacement products. The CDC will act as the central laboratory for the study and provide inhibitor testing.

  5. Report bleeding complications that occur within the first 50 ED [ Time Frame: 6 years ]
    The documentation of bleeding events in the study records will be based on the review of bleeding and infusion records provided by the participant or the from medical chart review during the first 50 exposure days to clotting factor replacement product.

  6. Summarize factor replacement dosing regimen prescribed to this study population within the first 50 ED [ Time Frame: 6 years ]
    A summary of the prescribed clotting factor replacement regimen will provide data on evolving treatment practices, including specific clotting factor replacement and non-factor products.

  7. Report on the number of transient inhibitor, e.g., those which resolve without change in therapy [ Time Frame: 6 years ]
    The CDC is acting as the central laboratory for inhibitor testing. The CDC will report results to the participating HTC. If a blood specimen from a participant has an elevated result; potentially indicating the development of an inhibitor, a new blood specimen from the participant will be tested within 10 days of the first elevated result to determine if an inhibitor has developed. A transient inhibitor is defined as a positive inhibitor which is not confirmed on a consecutive repeat testing. Inhibitor testing results on all participants will be documented and reported by the HTC.

  8. Report on targeted post-approval safety data for events related to clotting factor replacement products used by prospectively enroll participants [ Time Frame: 6 years ]
    Documentation of adverse events experienced by prospectively enrolled participants during the study period of first 50 exposure days to clotting factor replacement product will be reported. The types of adverse events to be reported are limited to Serious Adverse Events as defined by the European Union Haemophilia Safety Surveillance System (EUHASS).

  9. Sub-study modules will be developed to evaluate and report on cohorts of study participants who initiated treatment with a specific product [ Time Frame: 6 years ]
    Measure the number of participants who initiate treatment with a specific treatment product

Information from the National Library of Medicine

Choosing to participate in a study is an important personal decision. Talk with your doctor and family members or friends about deciding to join a study. To learn more about this study, you or your doctor may contact the study research staff using the contacts provided below. For general information, Learn About Clinical Studies.

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Ages Eligible for Study:   0 Years to 13 Years   (Child)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   No
Sampling Method:   Non-Probability Sample
Study Population
The study will enroll a cohort of 250 participants born with hemophilia on or after January 1, 2010 who meet the eligibility criteria and are receiving care from one of the participating HTCs.

Inclusion Criteria:

  • Congenital hemophilia A; FVIII </=5% or congenital hemophilia B; FIX </=5%;
  • Birth date on or after January 1, 2010;
  • Care established at one of the participating HTCs;
  • Co-enrollment in the ATHNdataset; and
  • Parent or authorized guardian can provide informed consent

Exclusion Criteria:

  • Patients who are referred to the HTC with no record of bleed and factor utilization data

Information from the National Library of Medicine

To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.

Please refer to this study by its ClinicalTrials.gov identifier (NCT number): NCT03818529

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Contact: Carol Fedor (800)-360-2846 ext 122 cfedor@athn.org
Contact: Carrie O'Neill (800)-360-2846 ext 124 coneill@athn.org

Show Show 27 study locations
Sponsors and Collaborators
American Thrombosis and Hemostasis Network
CSL Behring
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Principal Investigator: Shannon Carpenter, MD, MS Children's Mercy Hospital Kansas City
Principal Investigator: Courtney Thornburg, MD, MS University of California San Diego, Rady Children's Hospital San Diego
Principal Investigator: Marijke van den Berg, MD, PhD Versiti
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Responsible Party: American Thrombosis and Hemostasis Network
ClinicalTrials.gov Identifier: NCT03818529    
Other Study ID Numbers: ATHN 8
First Posted: January 28, 2019    Key Record Dates
Last Update Posted: September 5, 2021
Last Verified: August 2021

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Studies a U.S. FDA-regulated Drug Product: No
Studies a U.S. FDA-regulated Device Product: No
Keywords provided by American Thrombosis and Hemostasis Network:
Previously Untreated Patients (PUPs)
Clotting Factor Replacement Products
Additional relevant MeSH terms:
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Hemophilia A
Hemophilia B
Blood Coagulation Disorders, Inherited
Blood Coagulation Disorders
Hematologic Diseases
Coagulation Protein Disorders
Hemorrhagic Disorders
Genetic Diseases, Inborn
Genetic Diseases, X-Linked