ATHN 2: Factor Switching Study

Hemophilia Clinical Trial

Official title:

A Longitudinal, Observational Study of Previously Treated Hemophilia Patients Switching Factor Replacement Products

Clinical Trial Details — Status: Completed

Administrative data

• NCT number: NCT02546622
• Other study ID #: ATHN 2
• Status: Completed
• Start date: September 2015
• Est. completion date: June 30, 2020

Study information

• Verified date: August 2020
• Source: American Thrombosis and Hemostasis Network
• Contact: n/a
• Is FDA regulated: No
• Study type: Observational

Clinical Trial Summary

This is a longitudinal, observational study of patients with Hemophilia A or B who are planning to switch to a newly approved coagulation factor replacement product, or who have recently switched factor products. The study will follow each patient for up to 1 year. Patients will be recruited at Hemophilia Treatment Centers (HTC) which are ATHN-affiliates. The primary outcome being studied is the development of inhibitor (i.e., antibodies to factor) at 1 year or 50 exposure days, whichever comes first.

The study will be conducted at approximately 30 HTCs, with a planned enrollment of 600 patients.The entire study duration is projected to be approximately 6 years.

In addition, optional substudies will be included for some products, as "Product-Specific Modules". These will be questionnaires to collect data for subjects receiving selected Factor products. For example, subjects receiving Kovaltry will be approached to participate in the 'Kovaltry Product-Specific Module'; subjects receiving Adynovate will be approached to participate in the 'Adynovate Product-Specific Module'. Questions will be related to product use, perceptions of product use, and other post-marketing consumer data.

Description:

This non-interventional, minimal risk cohort study will enroll patients with Hemophilia A or B who are planning or have recently switched to a new Factor product. The study will have 2 Arms, prospective and retrospective. The Prospective Arm will enroll patients who plan to switch to a new factor. The Retrospective Arm will enroll patients who have recently switched to a new factor (within the previous 50 weeks). Patient will be seen at baseline and for up to 4 additional visits, and quarterly follow-up by phone. Required study visits will be planned to coincide with routine follow-up visits whenever possible.

Please note that Factor Replacement Products are not being provided by the study.

The primary objective is to assess and characterize the rate of inhibitor development within one (1) year or fifty (50) exposure days, whichever is first, after switching clotting factor replacement products in previously treated patients (PTPs) with hemophilia A or B.

Data collected will include eligibility, demographics, medical history, hemophilia history (clotting history, product history, genotype and family history), inhibitor history, co-morbidities at baseline (i.e., HIV, Hepatitis C.), detailed clotting factor replacement product(s) usage and switching plan, and reasons for switching factor products. Also targeted physical exams will be performed at baseline and during follow-up, and targeted concomitant medication data will be collected. Data collection will also include patient-reported outcome(s) after 1 year, bleeding events, surgeries, laboratory Inhibitor testing and details regarding testing methodology, pharmacokinetic (PK) data (if known), new diagnoses, and co-morbidities (targeted), Safety/Adverse Events using European Union Hemophilia Safety Surveillance (EUHASS) definitions.

This study will evolve to include any newly approved (since January 2013) factors as they come to market. Cohorts will be defined by the brand/type of new clotting factor replacement product approved after January 1, 2013. The current list of specific new Factor VIII replacement products include Eloctate® (Bioverativ) and NovoEight® (NovoNordisk); Factor IX replacement products include Alprolix® (Bioverativ), Rixubis® (Baxalta), and IXinity® (Emergent Biosolutions). Others are both now available and imminent and include: Adynovate®, Idelvion®, Afstyla®, Kovaltry® and Jivi®.

The over-arching rationale for this protocol is that a pragmatic study which is consistent with real world practices across a wide range of patients that is not principally tied to a particular manufacturer or product may be of great advantage to the entire hemophilia community.

Study Duration

• Subjects on prophylaxis will be followed on study for up to 1 year. Each subject will be seen during a study visit or contacted by telephone at least once every 3 months (i.e., quarterly). Patients may participate for multiple 'cycles', if they switch factor products more than once while the study is actively recruiting.

Treatment regimen will be at the discretion of the subject's hemophilia caregivers. No treatment is being provided by the study.

• Substudies A number of substudies are planned with pharmaceutical sponsors to collect information from patients about their products' use. Participation in these optional substudies (product-specific modules) will be planned to coincide with study visits. These modules will collect information from subjects about their perception and use of factor use/treatment, physical activity levels and other general health questions. These data will be collected via questionnaire, primarily via phone.

Concomitant and Excluded Therapies

• Immune tolerance therapy is excluded on study. This includes immunosuppressive treatments used to eradicate inhibitors. Steroid treatments for allergic disorders and asthma, are allowed.

Data Collection System

• All data collected will be entered into electronic case report forms (eCRFs) within the secure ATHN Study Manager system. Subject Identifiers (IDs) will be generated in Clinical Manager.

• Reimbursement will be managed by each participating HTC. Most study centers will reimburse study subjects for travel and parking, but this varies by center.

Recruitment information / eligibility

• Status: Completed
• Enrollment: 310
• Est. completion date: June 30, 2020
• Est. primary completion date: June 30, 2020
• Accepts healthy volunteers: No
• Gender: All
• Age group: N/A and older

Eligibility

Inclusion Criteria

• Moderate or Severe Congenital Hemophilia A or B (FVIII or FIX clotting activity less than or equal to 5% of normal).

• Able to give informed consent (by patient or parent/authorized guardian).

• Previously treated with plasma-derived or recombinant clotting factor replacement products with at least 50 exposure days (as assessed either from direct clinical records in children under age 5, or by clinical history of dosing in older patients). For Arm B being enrolled retrospectively, this previous treatment must be prior to product switch under study.

• Planning to switch, or recently switched within the previous 50 weeks, to a new brand or type of replacement factor VIII or IX, FDA approved after January 1, 2013.

• Arm B only: Negative inhibitor screen within the last 6 months prior to switching.

Note: History of prior transient inhibitor or inhibitor eradicated by immune tolerance induction (ITI) are eligible.

Exclusion Criteria

• Presence of any known bleeding disorder other than hemophilia A or B (i.e., patients with concurrent hemophilia and a second hemostatic defect are NOT eligible). Low Von Willebrand Factor (VWF) without VWF diagnosis are not excluded.

• Presence of an active inhibitor >0.6 BU for factor VIII, > 0.4 BU for factor IX at the time of eligibility assessment. Detection of such an inhibitor at the baseline visit prior to dosing with the new product (Arm A), or after dosing with new factor dosing (Arm B), would result in early termination without other study assessments.

• Currently undergoing ITI.

• Immunosuppressive therapy (cyclophosphamide, mycophenolate, IVIG) within 90 days and Rituximab within 6 months; topical steroid treatments and short course steroids for asthma or allergy allowed.

• Previous participation in Phase I, II or III interventional trials of the factor product being switched to.

Related Conditions & MeSH terms

• Hemophilia
• Hemophilia A

Intervention

Biological:
• Factor VIII Replacement Products for Hemophilia which were FDA approved after January 1, 2013
Prophylaxis for prevention of bleeding, various regimens.
• Factor IX Replacement Products for Hemophilia which were FDA approved after January 1, 2013
Prophylaxis for prevention of bleeding, various regimens.

Locations

Country	Name	City	State
United States	University of Michigan Hemophilia and Coagulation Disorders Program	Ann Arbor	Michigan
United States	Children's Healthcare of Atlanta/Emory	Atlanta	Georgia
United States	University of Colorado Denver Hemophilia and Thrombosis Center	Aurora	Colorado
United States	Johns Hopkins University Medical Center	Baltimore	Maryland
United States	Boston Hemophilia Center at Children's Hospital of Boston	Boston	Massachusetts
United States	UTSW Medical Center at Dallas/Children's Medical Center	Dallas	Texas
United States	Michigan State University Center for Bleeding and Clotting Disorders	East Lansing	Michigan
United States	Indiana Hemophilia and Thrombosis Center (IHTC)	Indianapolis	Indiana
United States	Children's Mercy Hospital	Kansas City	Missouri
United States	Dartmouth-Hitchcock Comprehensive Hemophilia and Thrombosis Center	Lebanon	New Hampshire
United States	St Jude Children's Research Hospital	Memphis	Tennessee
United States	Blood Center of Wisconsin	Milwaukee	Wisconsin
United States	Yale Hemophilia Treatment Center	New Haven	Connecticut
United States	Louisiana Center for Bleeding and Clotting Disorders	New Orleans	Louisiana
United States	Weill Cornell Medicine	New York	New York
United States	Bleeding and Clotting Disorders Institute	Peoria	Illinois
United States	Children's Hospital of Philadelphia (CHOP)	Philadelphia	Pennsylvania
United States	Pennsylvania Comprehensive Hemophilia and Thrombophilia Program / Hospital of the University of Pennsylvania	Philadelphia	Pennsylvania
United States	The Hemophilia Center of Western Pennsylvania	Pittsburgh	Pennsylvania
United States	Oregon Health and Science University	Portland	Oregon
United States	Mary M. Gooley Hemophilia Center	Rochester	New York
United States	Johns Hopkins All Children's Hospital	Saint Petersburg	Florida
United States	University of California San Diego (UCSD)	San Diego	California
United States	Maine Hemophilia and Thrombosis Center	Scarborough	Maine
United States	Washington Center for Bleeding Disorders Bloodworks Northwest d/b/a Puget Sound Blood Center	Seattle	Washington
United States	St. Joseph's Children's Hospital	Tampa	Florida
United States	Children's National Medical Center	Washington	District of Columbia

Sponsors (5)

Lead Sponsor	Collaborator
American Thrombosis and Hemostasis Network	Bayer, Bioverativ Therapeutics Inc., CSL Behring, Shire

Country where clinical trial is conducted

United States, 

References & Publications (5)

Abshire TC, Brackmann HH, Scharrer I, Hoots K, Gazengel C, Powell JS, Gorina E, Kellermann E, Vosburgh E. Sucrose formulated recombinant human antihemophilic factor VIII is safe and efficacious for treatment of hemophilia A in home therapy--International Kogenate-FS Study Group. Thromb Haemost. 2000 Jun;83(6):811-6. — View Citation

Josephson CD, Abshire T. The new albumin-free recombinant factor VIII concentrates for treatment of hemophilia: do they represent an actual incremental improvement? Clin Adv Hematol Oncol. 2004 Jul;2(7):441-6. — View Citation

Mahlangu J, Powell JS, Ragni MV, Chowdary P, Josephson NC, Pabinger I, Hanabusa H, Gupta N, Kulkarni R, Fogarty P, Perry D, Shapiro A, Pasi KJ, Apte S, Nestorov I, Jiang H, Li S, Neelakantan S, Cristiano LM, Goyal J, Sommer JM, Dumont JA, Dodd N, Nugent K, Vigliani G, Luk A, Brennan A, Pierce GF; A-LONG Investigators. Phase 3 study of recombinant factor VIII Fc fusion protein in severe hemophilia A. Blood. 2014 Jan 16;123(3):317-25. doi: 10.1182/blood-2013-10-529974. Epub 2013 Nov 13. — View Citation

Powell JS. Lasting power of new clotting proteins. Hematology Am Soc Hematol Educ Program. 2014 Dec 5;2014(1):355-63. doi: 10.1182/asheducation-2014.1.355. Epub 2014 Nov 18. Review. — View Citation

Ragni, MV, Kessler, CM, and Lozier, JN (2009). Clinical aspects and therapy for hemophilia, in Hoffman R, Benz EJ, Shattil, SJ et al eds, Hematology, Basic Principles and Practice, 5th Edition, Churchill Livingstone, Philadelphia, pp 1911-1930.

Outcome

Type	Measure	Description	Time frame	Safety issue
Primary	Inhibitor Development	Inhibitor development is the primary outcome. Subjects will be followed closely and tested at baseline, after 10 Exposure Days and 50 Exposure Days, and/or at 1 year. Specimens will be submitted to local laboratories and evaluated for inhibitor titers, and inhibitors will be confirmed by local laboratories and CDC.	After 50 Exposure Days or 1 Year, whichever comes first
Secondary	Inhibitor Development	To determine the prospective incidence of inhibitor development after 10 exposure days to a new, novel recombinant factor following a switch from another clotting factor replacement product.	10 days
Secondary	Prevalence of risk factors for inhibitor development	To compare the prevalence of selected risk factors in patients with hemophilia who develop inhibitors following switching to a new product, to those found in subjects who do not develop inhibitors.	1 year
Secondary	Targeted post-marketing approval safety and efficacy data	To collect and summarize targeted post-marketing approval safety and efficacy data for events related to clotting factor replacement products, specifically; To collect data on bleeding events following switching factor.; To summarize replacement factor product dosing regimens prescribed to the study population.	1 year
Secondary	Platform for additional substudies	To serve as a platform for product-specific questionnaires in cohorts of patients who switch to a particular product.	1 year

External Links

•   American Thrombosis and Hemostasis Network (ATHN)
•   Hemophilia Treatment Center Directory