A Phase 2 Dose-finding Study of Atacicept in Subjects With Rheumatoid Arthritis (AUGUST I)

Study Overview
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Brief Summary
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This was a double-blind, placebo-controlled, parallel-arm, multicentre, prospective dose-finding trial of the safety and efficacy of atacicept in subjects with active rheumatoid arthritis who had failed a three month therapeutic trial with a tumor necrosis factor alpha (TNFa) antagonist due to lack of efficacy.

Official Title
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A Randomized, Double-blind, Placebo-controlled, Multicentre, Phase II Dose-finding Study of Atacicept Given Subcutaneously in Subjects With Rheumatoid Arthritis and Inadequate Response to TNFa Antagonist Therapy

Conditions
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Rheumatoid Arthritis

Intervention / Treatment
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* Drug: Atacicept
* Drug: Atacicept
* Drug: Atacicept
* Drug: Placebo matched to atacicept


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: Rheumatoid arthritis (RA) satisfying American College of Rheumatology (ACR) diagnostic criteria with a disease history of at least one year Male or female greater than or equal to (>=)18-years of age at time of informed consent Active RA as defined by: >=8 swollen joints (66-joint count), >=8 tender joints (68-joint count), and C-reactive protein (CRP) >=10 milligram per liter (mg/L) (central laboratory) and/or erythrocyte sedimentation rate (ESR) >= to 28 millimeter per hour (mm/h) Failure of at least one TNFa antagonist therapy (previously or at the time of screening) as specified in the protocol Other protocol defined inclusion criteria could apply Exclusion Criteria: Any condition, including laboratory findings or findings in the medical history or pre-trial assessments, that in the opinion of the Investigator constitutes a risk or a contraindication for the subject's participation in the trial or that could interfere with the trial objectives, conduct or evaluation Treatment with biologics aiming at B cell modulation such as rituximab or belimumab within 2 years before study Day 1 Any previous treatment with anakinra (Kineret), abatacept (Orencia) or tocilizumab within 3 months before study Day 1 Use of etanercept (Enbrel) within 28 days before study Day 1, or of infliximab (Remicade) or adalimumab (Humira) within 60 days before study Day 1 Participation in any interventional clinical trial with an unapproved investigational therapy within the 3 months before the start of this study (or within 5 half-lives of the investigated compound before study Day 1, whichever is longer) Other protocol defined exclusion criteria could apply

Ages Eligible for Study
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Minimum Age: 18 Years

Sexes Eligible for Study
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All

Accepts Healthy Volunteers
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No

Study Plan
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How is the study designed?
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Design Details

Primary Purpose: Treatment
Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: Quadruple


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Experimental: Atacicept 25 mg<br> | Drug: Atacicept<br>* Atacicept was administered subcutaneously at a dose of 25 milligram (mg) twice a week for initial 4 weeks as loading dose, followed by 25 mg once a week for subsequent 21 weeks.<br>|
| Experimental: Atacicept 75 mg<br> | Drug: Atacicept<br>* Atacicept was administered subcutaneously at a dose of 75 mg twice a week for initial 4 weeks as loading dose, followed by 75 mg once a week for subsequent 21 weeks.<br>|
| Experimental: Atacicept 150 mg<br> | Drug: Atacicept<br>* Atacicept was administered subcutaneously at a dose of 150 mg twice a week for initial 4 weeks as loading dose, followed by 150 mg once a week for subsequent 21 weeks.<br>|
| Placebo Comparator: Placebo<br> | Drug: Placebo matched to atacicept<br>* Placebo matched to atacicept was administered subcutaneously twice a week for initial 4 weeks, followed by once a week for subsequent 21 weeks.<br>|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Percentage of Participants Achieving American College of Rheumatology 20 Response Based on C-reactive Protein (ACR20-CRP) at Week 26 | ACR20-CRP response is defined as greater than or equal to (>=) 20 percent (%) improvement in both tender joint counts (based on a total of 68 joints) and swollen joint counts (based on a total of 66 joints) together with >=20% improvement in at least 3 of the following 5 measures: 1) participant's assessment of pain; 2) participant's global assessment of disease activity; 3) physician's global assessment of disease activity; 4) participant's assessment of physical function; and 5) acute-phase marker (CRP). | Week 26 | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Percentage of Participants Achieving American College of Rheumatology 50 Response Based on CRP (ACR50-CRP) at Week 26 | ACR50-CRP response is defined as >=50% improvement in both tender joint counts (based on a total of 68 joints) and swollen joint counts (based on a total of 66 joints) together with >=50% improvement in at least 3 of the following 5 measures: 1) participant's assessment of pain; 2) participant's global assessment of disease activity; 3) physician's global assessment of disease activity; 4) participant's assessment of physical function; and 5) acute-phase marker (CRP). | Week 26 | 
| Percentage of Participants Achieving American College of Rheumatology 70 Response Based on CRP (ACR70-CRP) at Week 26 | ACR70-CRP response is defined as >=70% improvement in both tender joint counts (based on a total of 68 joints) and swollen joint counts (based on a total of 66 joints) together with >=70% improvement in at least 3 of the following 5 measures: 1) participant's assessment of pain; 2) participant's global assessment of disease activity; 3) physician's global assessment of disease activity; 4) participant's assessment of physical function; and 5) acute-phase marker (CRP). | Week 26 | 
| Percentage of Participants Achieving Disease Activity Score in 28 Joints (DAS28) Based on CRP (DAS28-CRP) of Less Than or Equal to (<=) 3.2 at Week 26 | DAS28-CRP incorporates non-graded joint counts for tenderness and swelling based on a total of 28 joints, CRP as a marker of inflammation, and a general health assessment using a 100-millimeter (mm) visual analog scale (the participant's global assessment of disease activity). DAS28 ranges between 0 and 10 representing current disease activity. A value above 5.1 represents high disease activity, a value below 3.2 represents low disease activity, and a value below 2.6 represents remission. | Week 26 | 
| Percentage of Participants Achieving Disease Activity Score in 28 Joints (DAS28) Based on CRP (DAS28-CRP) of <=2.6 at Week 26 | DAS28-CRP incorporates non-graded joint counts for tenderness and swelling based on a total of 28 joints, CRP as a marker of inflammation, and a general health assessment using a 100 mm visual analog scale (the participant's global assessment of disease activity). DAS28 ranges between 0 and 10 representing current disease activity. A value above 5.1 represents high disease activity, a value below 3.2 represents low disease activity, and a value below 2.6 represents remission. | Week 26 | 
| Percentage of Participants Achieving Improvement in Health Assessment Questionnaire Disability Index (HAQ-DI) of at Least 0.3 From Baseline at Week 26 | The HAQ-DI is a participant-reported assessment of ability to perform tasks in 8 categories of daily living activities: dress/groom; arise; eat; walk; reach; grip; hygiene; and common activities over past week. Each item was scored on 4-point scale from 0 to 3: 0 = no difficulty; 1 = some difficulty; 2 = much difficulty; 3 = unable to do. Overall score was computed as the sum of domain scores and divided by the number of domains answered. Total possible score range is 0 to 3 where 0 = least difficulty and 3 = extreme difficulty. Percentage of participants achieving improvement in HAQ-DI of at least 0.3 from baseline at Week 26 was reported. | Week 26 | 
| Percentage of Participants With Good or Moderate European League Against Rheumatism (EULAR) Response at Week 26 | The EULAR response criteria evaluate change in DAS28 scores represented as good response, moderate response, or no response considering both the current DAS28 score and the observed improvement from baseline. Participants were considered to have good or moderate EULAR response if at the time of assessment, their DAS28 score was <=5.1 and the improvement from baseline in their DAS28 score was greater than (>) 0.6; or if at the time of assessment, their DAS28 score was >5.1 and improvement from baseline in their DAS28 score was >1.2. | Week 26 | 
| Number of Participants With Adverse Events (AEs) and Serious Adverse Events (SAEs) | An AE was defined as any new untoward medical occurrences/worsening of pre-existing medical condition without regard to possibility of causal relationship. An SAE was an AE that resulted in any of the following outcomes: death; life threatening; persistent/significant disability/incapacity; initial or prolonged inpatient hospitalization; congenital anomaly/birth defect. | Baseline up to Week 38 | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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atacicept, arthritis