An 18-month Low-interventional Study to Assess Joint Health in Haemophilia A and B Patients on Prophylaxis With Efmoroctocog Alfa or Eftrenonacog Alfa

Phase 4

Terminated

Conditions: Hemophilia A
Hemophilia B

Registration Number: NCT05856266

Lead Sponsor: Swedish Orphan Biovitrum

Brief Summary: The goal of this low-interventional study is to describe the overall joint health in patients with haemophilia A or haemophilia B prophylactically treated with rFVIIIFc or rFIXFc.

The main question it aims to answer is the:

• Evaluation of the overall joint status as detected by ultrasound in haemophilia A and B patients treated with rFVIIIFc or rFIXFc prophylaxis over the 18-month study period.

Participants will come to 6-monthly visits during the 18-month long study period and will perform an ultrasound with the Haemophilia Early Arthropathy Detection with Ultrasound (HEAD-US) protocol at each visit. At baseline and end of study visits, the patients will be assessed with the clinical scoring system Haemophilia Joint Health Score (HJHS) and complete patient questionnaires. Retrospective data from patient medical records will also be collected for at least 6 months before enrolment in the study.

Detailed Description: The main purpose of this study is to prospectively describe the joint health over an 18-month period of prophylactic treatment with rFVIIIFc or rFIXFc in patients with haemophilia A or haemophilia B in a real-world setting in Europe.

This is a low-interventional, multicentre study using point-of-care US examination for regular monitoring of joint health and detection of hypertrophic synovium, cartilage and bone damage. At the same time, clinical joint status will also be examined by HJHS. This study will evaluate the presence, resolution, recurrence, and new development of target joints. It will also describe bleeding episodes and evaluate the quality of life and physical activity with PROs. If patients are using the CE marked Florio HAEMO app in their routine clinical practice, they will be offered to participate in an optional sub-study that aims to explore possible correlations between the levels of physical activity, the estimated FVIII/FIX levels and bleeding occurrence.

Recruitment & Eligibility

Status: TERMINATED

Sex: All

Target Recruitment: 10

Inclusion Criteria

Age ≥ 6 years
Diagnosis of haemophilia A or B
Having at least 6 months documented pre-study treatment data regarding treatment prescriptions and bleeding episodes prior to the baseline visit
Previous treatment for haemophilia A or B with any marketed recombinant and/or plasma-derived FVIII or FIX concentrate for at least 6 months
Start of prophylactic treatment with rFVIIIFc or rFIXFc prior to study enrollment or latest at the baseline visit, in accordance with local regulations
Signed and dated informed consent provided by the patient, or the patient's legally authorized representative for patients under the legal age. Assent should be obtained from paediatric patients in accordance with local regulations

Exclusion Criteria

Any medical condition which in the opinion of the investigator makes the subject patient unsuitable for inclusion
Prophylactic treatment with non-factor therapy during the 6 months prior to enrolment
Presence of factor VIII or FIX inhibitory antibodies (inhibitors) (≥0.60 Bethesda Units [BU]/mL) at the latest available inhibitor test
Enrolment in a concurrent clinical interventional study, or intake of an IMP, within three months prior to inclusion in this study
Foreseeable inability to cooperate with given instructions or study procedures

Study & Design

Study Type: INTERVENTIONAL

Study Design: SINGLE_GROUP

Primary Outcome Measures

Name	Time	Method
Change From Baseline in Total HEAD-US Score up to Month 18 (End of Study - EOS)	Baseline and month 18	HEAD-US is a standardized, fast, repeatable, and simple ultrasound scoring protocol for hemophiliac joints. The HEAD-US joint score will be calculated for the six index joints (elbows, knees, and ankles). The specific joint score is made up of three item scores: disease activity (synovitis), disease damage of articular surfaces, and disease damage of subchondral bone. The specific joint score is the sum of the three item scores for each specific joint. Its values range from 0 (minimum) to 8 (maximum). The total score represents the sum of item scores for abnormalities detected.

Secondary Outcome Measures

Name	Time	Method
Change From Baseline in HEAD-US Score for Hypertrophic Synovium	Baseline, month 6, 12 and 18	HEAD-US is a standardized, fast, repeatable, and simple ultrasound scoring protocol for hemophiliac joints. The HEAD-US joint score will be calculated for the six index joints (elbows, knees, and ankles). The disease activity (synovitis) score rates the status of the hypertrophic synovium. Hypertrophic synovium is graded in three steps (0: absent/minimal; 1: mild/moderate \[score=1\], 2: severe \[score=2\]) based on the comprehensive evaluation of the joint recesses and the mean amount of synovial tissue contained in them.
Change From Baseline in HEAD-US Score for Cartilage	Baseline, month 6, 12 and 18	HEAD-US is a standardized, fast, repeatable, and simple ultrasound scoring protocol for hemophiliac joints. The HEAD-US joint score will be calculated for the six index joints (elbows, knees, and ankles). Concerning the articular cartilage, the damage is graded in five steps (0: normal; 1: echotexture abnormalities and focal loss involving \<25% of the target surface \[score=1\]; 2: partial/full-thickness loss of the cartilage involving at least 50% of the target surface \[score=2\]; 3: partial/full-thickness loss of the cartilage involving \>50% of the target surface \[score=3\]; 4: complete cartilage destruction or absent visualization of the articular cartilage on the target surface \[score=4\]).
Change From Baseline in HEAD-US Score for Bone	Baseline, month 6, 12 and 18	HEAD-US is a standardized, fast, repeatable, and simple ultrasound scoring protocol for hemophiliac joints. The HEAD-US joint score will be calculated for the six index joints (elbows, knees, and ankles). Damage of subchondral bone is scored using a three-grade scale (0: normal; 1: mild irregularities of the subchondral bone with/without initial osteophytes around the joint \[score=1\]; 2: deranged subchondral bone with/without erosions and presence of prominent osteophytes around the joint \[score=2\]).
Change From Baseline in Total Hemophilia Joint Health Score (HJHS) at Month 18 (EOS)	Baseline and month 18	The HJHS measures joint health, in the domain of body structure and function (i.e., impairment). The six index joints (elbows, knees, and ankles) will be examined and scored. The minimum score per joint is 0, the maximum score is 20. In addition, Gait is scored on a scale from 0 to 4 based on the number of skills that are not within the normal limits. The total score will be the sum of scores across all six joints plus the gait score (range from 0 to 124, with 0 being normal and 124 being the most severe disease).
Number of Target Joints	Baseline, month 6, 12 and 18	A target joint is defined as a joint with three or more spontaneous bleeds into the joint within a consecutive 6-month period. The study will evaluate the presence, resolution, recurrence, and new development of target joints.
Location of Target Joints	Baseline, month 6, 12 and 18	A target joint is defined as a joint with three or more spontaneous bleeds into the joint within a consecutive 6-month period. The study will evaluate the presence, resolution, recurrence, and new development of target joints.
Total Annualized Bleeding Rate (ABR)	6 months retrospective period to baseline, baseline to 6 months, 6-12 months, 12-18 months and entire study period	For any bleeding episode, the following will be collected: bleeding episode circumstance (e.g., spontaneous, traumatic), bleeding episode location (e.g., muscle, joint, other), date of bleeding episode, dose (IU) and number of injections used to treat the bleed.
Joint ABR	6 months retrospective period to baseline, baseline to 6 months, 6-12 months, 12-18 months and entire study period	For any bleeding episode, the following will be collected: bleeding episode circumstance (e.g., spontaneous, traumatic), bleeding episode location, date of bleeding episode, dose (IU) and number of injections used to treat the bleed.
Target Joint ABR	6 months retrospective period to baseline, baseline to 6 months, 6-12 months, 12-18 months and entire study period	For any bleeding episode, the following will be collected: bleeding episode circumstance (e.g., spontaneous, traumatic), bleeding episode location, date of bleeding episode, dose (IU) and number of injections used to treat the bleed.
Traumatic/Spontaneous ABR	6 months retrospective period to baseline, baseline to 6 months, 6-12 months, 12-18 months and entire study period	For any bleeding episode, the following will be collected: bleeding episode circumstance (e.g., spontaneous, traumatic), bleeding episode location (e.g., muscle, joint, other), date of bleeding episode, dose (IU) and number of injections used to treat the bleed.
PROMIS Physical Function/Activity Short Form 6b and 8a Scores	Baseline and 18 months	Patient-Reported Outcomes Measurement Information System (PROMIS) is a validated system of reliable and precise measures of patient-reported health status. PROMIS measures cover physical, mental, and social health, use a 5-point Likert response scale and a recall period of the past 7 days. The Numeric Rating Scale measures for adults (6b) consist of a single item rating physical function on average over the past 7 days, ranging from 5 (without any difficulty) to 1 (unable to do). Lower scores mean a worse outcome. The Numeric Rating Scale measures for pediatric and parent proxy (8a) each consist of a single item rating physical activity on average over the past 7 days, ranging from 1 (no days) to 5 (6-7 days). Lower scores mean a worse outcome.
PROMIS Pain Intensity 3a and 1a Scores	Baseline and month 18	Patient-Reported Outcomes Measurement Information System (PROMIS) is a validated system of reliable and precise measures of patient-reported health status. PROMIS measures cover physical, mental, and social health, use a 5-point Likert response scale and a recall period of the past 7 days. The Numeric Rating Scale measures for adults (3a) consist of a single item rating pain over the past 7 days from 1 (had no pain) to 5 (very severe). Higher scores mean a worse outcome. The Numeric Rating Scale measures for pediatric and parent proxy (1a) each consist of a single item rating pain over the past 7 days, ranging from 0 (no pain) to 10 (worst pain you can think of). Higher scores mean a worse outcome.
PROMIS Pain Interference Short Form 6a and 8a Scores	Baseline and month 18	Patient-Reported Outcomes Measurement Information System (PROMIS) is a validated system of reliable and precise measures of patient-reported health status. PROMIS measures cover physical, mental, and social health, use a 5-point Likert response scale and a recall period of the past 7 days. The Numeric Rating Scale measures (adult, pediatric, parent proxy) each consist of a single item rating pain interference with different activities over the past 7 days, ranging from 1 (not at all/never) to 5 (very much/almost always). Higher scores mean a worse outcome.
IPAQ-SF Scores	Baseline and month 18	International Physical Activity Questionnaire - Short Form (IPAQ-SF). The IPAQ-SF is a validated, 7-day recall questionnaire measuring current levels of physical activity. Scoring of the IPAQ results in a continuous variable in the form of total MET-minutes per week, as well as categorization into high, moderate, or low physical activity level. Higher scores mean higher physical activity level (better outcome).

Trial Locations

Locations (56): Study site 100
🇧🇬
Sofia, Bulgaria
Study site 101
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Sofia, Bulgaria
Study site 102
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Zagreb, Croatia
Study site 103
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Zagreb, Croatia
Study site 108
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Brno, Czechia
Study site 107
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Liberec, Czechia
Study site 104
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Olomouc, Czechia
Study site 105
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Praha, Czechia
Study site 106
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Praha, Czechia
Study site 115
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Bordeaux, France
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Study site 100
🇧🇬Sofia, Bulgaria