A Study to Compare Upadacitinib (ABT-494) Monotherapy to Methotrexate (MTX) Monotherapy in Adults With Rheumatoid Arthritis (RA) Who Have Not Previously Taken Methotrexate

Study Overview
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Brief Summary
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The objectives of Period 1 were the following: To compare the safety and efficacy of upadacitinib 7.5 mg once daily (QD) monotherapy (for participants in Japan only), 15 mg QD monotherapy, and 30 mg QD monotherapy versus weekly methotrexate monotherapy for the treatment of signs and symptoms of RA in methotrexate-naïve adults with moderately to severely active RA; To compare the efficacy of upadacitinib 15 mg QD monotherapy and upadacitinib 30 mg QD monotherapy versus weekly methotrexate monotherapy for prevention of structural progression in methotrexate-naïve adults with moderately to severely active RA. The objective of Period 2 is to evaluate the long-term safety, tolerability, and efficacy of upadacitinib 7.5 mg QD (for participants in Japan only), 15 mg QD, and 30 mg QD in adults with RA who have completed Period 1.

Detailed Description
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This study includes 2 periods (a 48-week double-blind treatment period and a long-term extension period) and a Japan substudy. In Period 1 participants will be randomized in a 1:1:1 ratio to treatment Groups 2, 3, and 4 below, except for participants from Japan, who will be randomized in a 2:1:1:1 ratio to Groups 1, 2, 3, and 4: Group 1: Upadacitinib 7.5 mg once daily (QD) monotherapy (participants in Japan only) Group 2: Upadacitinib 15 mg QD monotherapy Group 3: Upadacitinib 30 mg QD monotherapy Group 4: Methotrexate monotherapy Rescue therapy is defined for Weeks 12 through 24, Week 26, and Weeks 36 through 40. Starting at Week 12 through Week 24, participants who do not achieve ≥ 20% improvement in both tender joint count (TJC) and swollen joint count (SJC) compared with baseline at two consecutive visits will continue on their blinded therapy and the Investigator should optimize (initiate or increase) background RA medications: non-steroidal anti-inflammatory drug(s) (NSAIDs), corticosteroids (oral ≤ 10 mg/day prednisone equivalent or prednisone equivalent ≤ 0.5 mg/kg/day for 3 consecutive days) and/or low-potency analgesics. Rescue therapy for participants who meet the following criteria at Week 26 are as follows: Participants who do not achieve clinical remission (CR) based on Clinical Disease Activity Index (CDAI) (defined as a CDAI score ≤ 2.8): but achieve ≥ 20% improvement in both TJC and SJC compared with baseline will continue on blinded study drug and the Investigator should optimize (initiate or increase) background RA medications: NSAIDs, corticosteroids (oral ≤ 10 mg/day prednisone equivalent and up to 2 local injections), low-potency analgesics and conventional synthetic disease-modifying anti-rheumatic drug(s) (csDMARDs) (only 1 of the following: sulfasalazine, hydroxychloroquine or chloroquine) throughout the remainder of Period 1 and until the study is unblinded. and do not achieve ≥ 20% improvement in both TJC and SJC compared with baseline and originally assigned to methotrexate will be re-randomized in a 1:1 ratio to receive blinded upadacitinib 15 mg QD or upadacitinib 30 mg QD (participants in Japan will be randomized 1:1:1 to receive upadacitinib 7.5 mg QD, 15 mg QD, or 30 mg QD) while continuing methotrexate treatment in a blinded manner until the study is unblinded. Participants originally assigned to upadacitinib will add methotrexate 10 mg/week (7.5 mg for Japan) to upadacitinib in a blinded manner and will remain on upadacitinib plus methotrexate 10 mg/week (7.5 mg for Japan) until the study is unblinded. Starting at Week 36 through Week 40, participants who do not achieve ≥ 20% improvement in both TJC and SJC compared with baseline at two consecutive visits will continue on their blinded therapy and the Investigator should optimize (initiate or increase) background RA medications: NSAIDs, corticosteroids (oral ≤ 10 mg/day prednisone equivalent or prednisone equivalent ≤ 0.5 mg/kg/day for 3 consecutive days and up to 2 local injections), low-potency analgesics and csDMARDs (only 1 of the following: sulfasalazine, hydroxychloroquine or chloroquine). Participants who complete the Week 48 visit (end of Period 1) will enter the long-term extension, Period 2 (212 weeks) and continue study treatment per assignment at the end of Period 1 in a blinded fashion. When the last participant completes the last visit of Period 1 (Week 48), study drug assignment in both periods may be unblinded, and participants will be dispensed study drug in an open-label fashion until the completion of Period 2. Starting with Protocol Amendment 6, participants receiving upadacitinib 15 mg and 30 mg QD will receive open-label upadacitinib 15 mg QD, and participants receiving methotrexate will receive open-label methotrexate. A global analysis will be conducted for the comparisons of the primary and secondary efficacy endpoints between the upadacitinib 15 mg QD and 30 mg QD treatment groups versus the methotrexate treatment group for all participants (excluding the Japan specific upadacitinib 7.5 mg treatment group). Analyses will be conducted separately for United States (US)/Food and Drug Administration (FDA), European Union (EU)/European Medicines Agency (EMA), and Japan/Pharmaceuticals and Medical Devices Agency (PMDA) regulatory purposes, each according to a pre-specified sequence of primary and ranked secondary endpoints. A separate Japan sub-study analysis will be conducted for the comparisons of the efficacy endpoints between the upadacitinib 7.5 mg QD, 15 mg QD, and 30 mg QD treatment groups versus the methotrexate treatment group for participants enrolled in Japan only.

Official Title
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A Phase 3, Randomized, Double-Blind Study Comparing Upadacitinib (ABT-494) Once Daily Monotherapy to Methotrexate (MTX) Monotherapy in MTX-Naïve Subjects With Moderately to Severely Active Rheumatoid Arthritis

Conditions
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Rheumatoid Arthritis

Intervention / Treatment
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* Drug: Placebo to Upadacitinib
* Drug: Methotrexate
* Drug: Placebo to Methotrexate
* Drug: Upadacitinib


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: Duration of symptoms consistent with RA for ≥ 6 weeks who also fulfill the 2010 American College of Rheumatology (ACR)/European League Against Rheumatism (EULAR) classification criteria for RA. Naïve to Methotrexate (MTX) or, if already on MTX, have received no more than 3 weekly MTX doses with requirement to complete a 4-week MTX washout before the first dose of study drug. Participants with prior exposure to conventional synthetic disease-modifying anti-rheumatic drugs(csDMARDs) other than MTX may be enrolled if completed the washout period. Participant meets both of the following minimum disease activity criteria: -≥ 6 swollen joints (based on 66 joint counts) and ≥ 6 tender joints (based on 68 joint counts) at Screening and Baseline Visits. high sensitivity C reactive protein (hsCRP) ≥ 5 mg/L (central lab, upper limit of normal [ULN] 2.87 mg/L at Screening Visit. Greater than or equal to 1 bone erosion on x-ray (by local reading) OR in the absence of documented bone erosion, both positive rheumatoid factor (RF) and positive anti-cyclic citrullinated peptide (anti CCP) autoantibodies are required at Screening. Stable dose of non-steroidal anti-inflammatory drugs (NSAIDs), acetaminophen, oral corticosteroids (equivalent to prednisone ≤ 10 mg/day), or inhaled corticosteroids for stable medical conditions are allowed but must have been at a stable dose ≥ 1 week prior to the first dose of study drug. Exclusion Criteria: Intolerant to Methotrexate (MTX). Prior exposure to any Janus kinase (JAK) inhibitor (including but not limited to tofacitinib, baricitinib, and filgotinib). Prior exposure to any biologic disease-modifying anti-rheumatic drugs (bDMARDs). History of any arthritis with onset prior to age 17 years or current diagnosis, inflammatory joint disease other than RA (including but not limited to gout, systemic lupus erythematosus, psoriatic arthritis, axial spondyloarthritis including ankylosing spondylitis and non-radiographic axial spondyloarthritis, reactive arthritis, overlap connective tissue diseases, scleroderma, polymyositis, dermatomyositis, fibromyalgia [currently with active symptoms]. Current diagnosis of secondary Sjogren's Syndrome is permitted. Has been treated with intra-articular, intramuscular, intravenous, trigger point or tender point, intra-bursa, or intra-tendon sheath corticosteroids in the preceding 8 weeks prior to the first dose of study drug.

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
Interventional Model Description: Participants were to be randomized in a 1:1:1 ratio to treatment Groups 2, 3, and 4 below, except for participants from Japan, who were to be randomized in a 2:1:1:1 ratio to Groups 1, 2, 3, and 4: Group 1: Upadacitinib 7.5 mg QD monotherapy (Japan only) Group 2: Upadacitinib 15 mg QD monotherapy (43 countries, including Japan) Group 3: Upadacitinib 30 mg QD monotherapy (43 countries, including Japan) Group 4: MTX monotherapy (43 countries, including Japan)
Masking: Quadruple


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Active Comparator: Methotrexate<br>Period 1: Participants will receive placebo to upadacitinib once daily and methotrexate once weekly for 48 weeks. Period 2: Participants will continue on placebo to upadacitinib once daily and methotrexate once weekly until the study is unblinded, after which participants will receive open-label methotrexate up to Week 260. | Drug: Placebo to Upadacitinib<br>* Tablet; Oral<br>Drug: Methotrexate<br>* Capsule or Tablet; Oral<br>|
| Experimental: Upadacitinib 7.5 mg (Japan-only)<br>Period 1: Participants will receive upadacitinib 7.5 mg once daily and placebo to methotrexate once weekly for 48 weeks. Period 2: Participants will continue on upadacitinib 7.5 mg once daily and placebo to methotrexate once weekly until the study is unblinded, after which participants will receive open-label upadacitinib 7.5 mg up to Week 260. | Drug: Placebo to Methotrexate<br>* Capsule or Tablet; Oral<br>Drug: Upadacitinib<br>* Tablet; Oral<br>* Other names: Rinvoq;|
| Experimental: Upadacitinib 15 mg<br>Period 1: Participants will receive upadacitinib 15 mg once daily and placebo to methotrexate once weekly for 48 weeks. Period 2: Participants will continue on upadacitinib 15 mg once daily and placebo to methotrexate once weekly until the study is unblinded, after which participants will receive open-label upadacitinib 15 mg up to Week 260. | Drug: Placebo to Methotrexate<br>* Capsule or Tablet; Oral<br>Drug: Upadacitinib<br>* Tablet; Oral<br>* Other names: Rinvoq;|
| Experimental: Upadacitinib 30 mg<br>Period 1: Participants will receive upadacitinib 30 mg once daily and placebo to methotrexate once weekly for 48 weeks. Period 2: Participants will continue on upadacitinib 30 mg once daily and placebo to methotrexate once weekly until the study is unblinded, after which participants will receive open-label upadacitinib 30 mg once daily. After implementation of Protocol Amendment 6 participants will receive upadacitinib 15 mg once daily up to Week 260. | Drug: Placebo to Methotrexate<br>* Capsule or Tablet; Oral<br>Drug: Upadacitinib<br>* Tablet; Oral<br>* Other names: Rinvoq;|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Percentage of Participants With an American College of Rheumatology 50% (ACR50) Response at Week 12 - Global Analysis | The primary endpoint for United States (US)/Food and Drug Administration (FDA) regulatory purposes was ACR 50% response (ACR50) at Week 12. Participants who met the following 3 conditions for improvement from Baseline were classified as meeting the ACR50 response criteria: ≥ 50% improvement in 68-tender joint count; ≥ 50% improvement in 66-swollen joint count; and ≥ 50% improvement in at least 3 of the 5 following parameters: Physician global assessment of disease activity Patient global assessment of disease activity Patient assessment of pain Health Assessment Questionnaire - Disability Index (HAQ-DI) High-sensitivity C-reactive protein (hsCRP). | Baseline and Week 12 | 
| Percentage of Participants Achieving Clinical Remission (CR) Based on DAS28(CRP) at Week 24 - Global Analysis | The primary endpoint for European Union (EU)/European Medicines Agency (EMA) regulatory purposes was clinical remission, based on a Disease Activity Score 28 (DAS28)-CRP score of < 2.6 at Week 24. The DAS28 is a composite index used to assess rheumatoid arthritis disease activity, calculated based on the tender joint count (out of 28 evaluated joints), swollen joint count (out of 28 evaluated joints), Patient's Global Assessment of Disease Activity (0-100 mm), and hsCRP (in mg/L). Scores on the DAS28 range from 0 to approximately 10, where higher scores indicate more disease activity. A DAS28 score less than 2.6 indicates clinical remission. | Week 24 | 
| Percentage of Participants With an American College of Rheumatology 20% (ACR20) Response at Week 12 - Global Analysis | The primary endpoint for Japan/Pharmaceuticals and Medical Devices Agency (PMDA) regulatory purposes was ACR 20% response (ACR20) at Week 12. Participants who met the following 3 conditions for improvement from Baseline were classified as meeting the ACR20 response criteria: ≥ 20% improvement in 68-tender joint count; ≥ 20% improvement in 66-swollen joint count; and ≥ 20% improvement in at least 3 of the 5 following parameters: Physician global assessment of disease activity Patient global assessment of disease activity Patient assessment of pain Health Assessment Questionnaire - Disability Index (HAQ-DI) High-sensitivity C-reactive protein (hsCRP). | Baseline and Week 12 | 
| Change From Baseline in Modified Total Sharp Score (mTSS) at Week 24 - Global Analysis | The second primary endpoint for Japan/PMDA regulatory purposes was change from baseline in mTSS at Week 24. The mTSS measures the level of joint damage from radiographs of the hands and feet. Joint erosion and joint space narrowing (JSN) were assessed by two independent, blinded readers. Joint erosion was assessed in 16 joints in each hand/wrist and 6 joints in each foot. Each joint was scored from 0 (no erosion) to 5 for hands/wrists or to 10 for feet (complete collapse). The total erosion score ranges from 0 to 280 (worst). JSN was assessed in 15 joints of each hand and wrist, and 6 joints of each foot, including subluxation, from 0 (normal) to 4 (complete loss of joint space, bony ankylosis, or luxation). The total JSN score ranges from 0 to 168 (worst). The mTSS is the sum of the joint erosion and JSN scores and ranges from 0 (normal) to 448 (worst). A change from Baseline greater than 0 indicates progression. | Baseline to Week 24 | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Change From Baseline in DAS28 (CRP) at Week 12 - Global Analysis | The DAS28 is a composite index used to assess rheumatoid arthritis disease activity, calculated based on the tender joint count (out of 28 evaluated joints), swollen joint count (out of 28 evaluated joints), Patient's Global Assessment of Disease Activity (0-100 mm), and hsCRP (in mg/L). Scores on the DAS28 range from 0 to approximately 10, where higher scores indicate more disease activity. A negative change from Baseline in DAS28 (CRP) indicates improvement in disease activity. | Baseline to Week 12 | 
| Change From Baseline in Health Assessment Questionnaire Disability Index (HAQ-DI) at Week 12 - Global Analysis | The Health Assessment Questionnaire - Disability Index is a patient-reported questionnaire that measures the degree of difficulty a person has in accomplishing tasks in 8 functional areas (dressing, arising, eating, walking, hygiene, reaching, gripping, and errands and chores) over the past week. Participants assessed their ability to do each task on a scale from 0 (without any difficulty) to 3 (unable to do). Scores were averaged to provide an overall score ranging from 0 to 3, where 0 represents no disability and 3 represents very severe, high-dependency disability. A negative change from Baseline in the overall score indicates improvement. | Baseline to week 12 | 
| Percentage of Participants Achieving Low Disease Activity (LDA) Based on DAS28(CRP) at Week 12 - Global Analysis | The DAS28(CRP) is a composite index used to assess rheumatoid arthritis disease activity, calculated based on the tender joint count (out of 28 evaluated joints), swollen joint count (out of 28 evaluated joints), Patient's Global Assessment of Disease Activity (0-100 mm), and hsCRP (in mg/L). Scores on the DAS28 range from 0 to approximately 10, where higher scores indicate more disease activity. A DAS28(CRP) score less than or equal to 3.2 indicates low disease activity. | Week 12 | 
| Change From Baseline in Short-Form 36 (SF-36) Physical Component Score (PCS) at Week 12 - Global Analysis | The Short Form 36-Item Health Survey (SF-36) Version 2 is a self-administered questionnaire that measures the impact of disease on overall quality of life during the past 4 weeks. The SF-36 consists of 36 questions in eight domains (physical function, pain, general and mental health, vitality, social function, physical and emotional health). The physical component score is a weighted combination of the 8 subscales with positive weighting for physical functioning, role-physical, bodily pain, and general health. The PCS was calculated using norm-based scoring so that 50 is the average score and the standard deviation equals 10. Higher scores are associated with better functioning/quality of life; a positive change from baseline score indicates an improvement. | Baseline to week 12 | 
| Change From Baseline in DAS28 (CRP) at Week 24 - Global Analysis | The DAS28 is a composite index used to assess rheumatoid arthritis disease activity, calculated based on the tender joint count (out of 28 evaluated joints), swollen joint count (out of 28 evaluated joints), Patient's Global Assessment of Disease Activity (0-100 mm), and hsCRP (in mg/L). Scores on the DAS28 range from 0 to approximately 10, where higher scores indicate more disease activity. A negative change from Baseline in DAS28 (CRP) indicates improvement in disease activity. | Baseline to Week 24 | 
| Change From Baseline in Health Assessment Questionnaire Disability Index (HAQ-DI) at Week 24 - Global Analysis | The Health Assessment Questionnaire - Disability Index is a patient-reported questionnaire that measures the degree of difficulty a person has in accomplishing tasks in 8 functional areas (dressing, arising, eating, walking, hygiene, reaching, gripping, and errands and chores) over the past week. Participants assessed their ability to do each task on a scale from 0 (without any difficulty) to 3 (unable to do). Scores were averaged to provide an overall score ranging from 0 to 3, where 0 represents no disability and 3 represents very severe, high-dependency disability. A negative change from Baseline in the overall score indicates improvement. | Baseline to Week 24 | 
| Percentage of Participants With an ACR50 Response at Week 24 - Global Analysis | Participants who met the following 3 conditions for improvement from Baseline were classified as meeting the ACR50 response criteria: ≥ 50% improvement in 68-tender joint count; ≥ 50% improvement in 66-swollen joint count; and ≥ 50% improvement in at least 3 of the 5 following parameters: Physician global assessment of disease activity Patient global assessment of disease activity Patient assessment of pain Health Assessment Questionnaire - Disability Index (HAQ-DI) High-sensitivity C-reactive protein (hsCRP). | Baseline and Week 24 | 
| Percentage of Participants Achieving Low Disease Activity (LDA) Based on DAS28(CRP) at Week 24 - Global Analysis | The DAS28(CRP) is a composite index used to assess rheumatoid arthritis disease activity, calculated based on the tender joint count (out of 28 evaluated joints), swollen joint count (out of 28 evaluated joints), Patient's Global Assessment of Disease Activity (0-100 mm), and hsCRP (in mg/L). Scores on the DAS28 range from 0 to approximately 10, where higher scores indicate more disease activity. A DAS28(CRP) score less than or equal to 3.2 indicates low disease activity. | Week 24 | 
| Change From Baseline in Short-Form 36 (SF-36) Physical Component Score (PCS) at Week 24 - Global Analysis | The Short Form 36-Item Health Survey (SF-36) Version 2 is a self-administered questionnaire that measures the impact of disease on overall quality of life during the past 4 weeks. The SF-36 consists of 36 questions in eight domains (physical function, pain, general and mental health, vitality, social function, physical and emotional health). The physical component score is a weighted combination of the 8 subscales with positive weighting for physical functioning, role-physical, bodily pain, and general health. The PCS was calculated using norm-based scoring so that 50 is the average score and the standard deviation equals 10. Higher scores are associated with better functioning/quality of life; a positive change from baseline score indicates an improvement. | Baseline to Week 24 | 
| Percentage of Participants With No Radiographic Progression at Week 24 - Global Analysis | No radiographic progression is defined as a change from Baseline in mTSS ≤ 0. The mTSS measures the level of joint damage from radiographs of the hands and feet. Joint erosion and joint space narrowing (JSN) were assessed by two independent, blinded readers. Joint erosion severity was assessed in 16 joints in each hand and wrist and 6 joints in each foot. Each joint was scored from 0 (no erosion) to 5 for hands/wrists or to 10 for feet (complete collapse). The total erosion score ranges from 0 to 280 (worst). Joint space narrowing (JSN) was assessed in 15 joints of each hand and wrist, and 6 joints of each foot, including subluxation, from 0 (normal) to 4 (complete loss of joint space, bony ankylosis, or luxation). The total JSN score ranges from 0 to 168 (worst). The mTSS is the sum of the joint erosion and JSN scores and ranges from 0 (normal) to 448 (worst). | Week 24 | 
| Percentage of Participants With an American College of Rheumatology 70% (ACR70) Response at Week 12 - Global Analysis | Participants who met the following 3 conditions for improvement from Baseline were classified as meeting the ACR70 response criteria: ≥ 70% improvement in 68-tender joint count; ≥ 70% improvement in 66-swollen joint count; and ≥ 70% improvement in at least 3 of the 5 following parameters: Physician global assessment of disease activity Patient global assessment of disease activity Patient assessment of pain Health Assessment Questionnaire - Disability Index (HAQ-DI) High-sensitivity C-reactive protein (hsCRP). | Baseline and Week 12 | 
| Percentage of Participants With an ACR20 Response at Week 24 - Global Analysis | Participants who met the following 3 conditions for improvement from Baseline were classified as meeting the ACR20 response criteria: ≥ 20% improvement in 68-tender joint count; ≥ 20% improvement in 66-swollen joint count; and ≥ 20% improvement in at least 3 of the 5 following parameters: Physician global assessment of disease activity Patient global assessment of disease activity Patient assessment of pain Health Assessment Questionnaire - Disability Index (HAQ-DI) High-sensitivity C-reactive protein (hsCRP). | Baseline and Week 24 | 
| Percentage of Participants With an ACR70 Response at Week 24 - Global Analysis | Participants who met the following 3 conditions for improvement from Baseline were classified as meeting the ACR70 response criteria: ≥ 70% improvement in 68-tender joint count; ≥ 70% improvement in 66-swollen joint count; and ≥ 70% improvement in at least 3 of the 5 following parameters: Physician global assessment of disease activity Patient global assessment of disease activity Patient assessment of pain Health Assessment Questionnaire - Disability Index (HAQ-DI) High-sensitivity C-reactive protein (hsCRP). | Baseline and Week 24 | 
| Percentage of Participants With an ACR20 Response at Week 12 - Japan Sub-study | Participants who met the following 3 conditions for improvement from Baseline were classified as meeting the ACR20 response criteria: ≥ 20% improvement in 68-tender joint count; ≥ 20% improvement in 66-swollen joint count; and ≥ 20% improvement in at least 3 of the 5 following parameters: Physician global assessment of disease activity Patient global assessment of disease activity Patient assessment of pain Health Assessment Questionnaire - Disability Index (HAQ-DI) High-sensitivity C-reactive protein (hsCRP). | Baseline and Week 12 | 
| Percentage of Participants With an ACR50 Response at Week 12 - Japan Sub-study | Participants who met the following 3 conditions for improvement from Baseline were classified as meeting the ACR50 response criteria: ≥ 50% improvement in 68-tender joint count; ≥ 50% improvement in 66-swollen joint count; and ≥ 50% improvement in at least 3 of the 5 following parameters: Physician global assessment of disease activity Patient global assessment of disease activity Patient assessment of pain Health Assessment Questionnaire - Disability Index (HAQ-DI) High-sensitivity C-reactive protein (hsCRP). | Baseline and Week 12 | 
| Percentage of Participants With an ACR70 Response at Week 12 - Japan Sub-study | Participants who met the following 3 conditions for improvement from Baseline were classified as meeting the ACR70 response criteria: ≥ 70% improvement in 68-tender joint count; ≥ 70% improvement in 66-swollen joint count; and ≥ 70% improvement in at least 3 of the 5 following parameters: Physician global assessment of disease activity Patient global assessment of disease activity Patient assessment of pain Health Assessment Questionnaire - Disability Index (HAQ-DI) High-sensitivity C-reactive protein (hsCRP). | Baseline and Week 12 | 
| Change From Baseline in DAS28 (CRP) at Week 12 - Japan Sub-study | The DAS28 is a composite index used to assess rheumatoid arthritis disease activity, calculated based on the tender joint count (out of 28 evaluated joints), swollen joint count (out of 28 evaluated joints), Patient's Global Assessment of Disease Activity (0-100 mm), and hsCRP (in mg/L). Scores on the DAS28 range from 0 to approximately 10, where higher scores indicate more disease activity. A negative change from Baseline in DAS28 (CRP) indicates improvement in disease activity. | Baseline to Week 12 | 
| Change From Baseline in Health Assessment Questionnaire Disability Index (HAQ-DI) at Week 12 - Japan Sub-study | The Health Assessment Questionnaire - Disability Index is a patient-reported questionnaire that measures the degree of difficulty a person has in accomplishing tasks in 8 functional areas (dressing, arising, eating, walking, hygiene, reaching, gripping, and errands and chores) over the past week. Participants assessed their ability to do each task on a scale from 0 (without any difficulty) to 3 (unable to do). Scores were averaged to provide an overall score ranging from 0 to 3, where 0 represents no disability and 3 represents very severe, high-dependency disability. A negative change from Baseline in the overall score indicates improvement. | Baseline to week 12 | 
| Change From Baseline in Short-Form 36 (SF-36) Physical Component Score (PCS) at Week 12 - Japan Sub-study | The Short Form 36-Item Health Survey (SF-36) Version 2 is a self-administered questionnaire that measures the impact of disease on overall quality of life during the past 4 weeks. The SF-36 consists of 36 questions in eight domains (physical function, pain, general and mental health, vitality, social function, physical and emotional health). The physical component score is a weighted combination of the 8 subscales with positive weighting for physical functioning, role-physical, bodily pain, and general health. The PCS was calculated using norm-based scoring so that 50 is the average score and the standard deviation equals 10. Higher scores are associated with better functioning/quality of life; a positive change from baseline score indicates an improvement. | Baseline to Week 12 | 
| Percentage of Participants Achieving Low Disease Activity (LDA) Based on DAS28(CRP) at Week 12 - Japan Sub-study | The DAS28(CRP) is a composite index used to assess rheumatoid arthritis disease activity, calculated based on the tender joint count (out of 28 evaluated joints), swollen joint count (out of 28 evaluated joints), Patient's Global Assessment of Disease Activity (0-100 mm), and hsCRP (in mg/L). Scores on the DAS28 range from 0 to approximately 10, where higher scores indicate more disease activity. A DAS28(CRP) score less than or equal to 3.2 indicates low disease activity. | Week 12 | 
| Percentage of Participants Achieving Clinical Remission (CR) Based on DAS28(CRP) at Week 24 - Japan Sub-study | The DAS28(CRP) is a composite index used to assess rheumatoid arthritis disease activity, calculated based on the tender joint count (out of 28 evaluated joints), swollen joint count (out of 28 evaluated joints), Patient's Global Assessment of Disease Activity (0-100 mm), and hsCRP (in mg/L). Scores on the DAS28 range from 0 to approximately 10, where higher scores indicate more disease activity. A DAS28 score less than 2.6 indicates clinical remission. | Week 24 | 
| Change From Baseline in Modified Total Sharp Score (mTSS) at Week 24 - Japan Sub-study | The mTSS measures the level of joint damage from radiographs of the hands and feet. Joint erosion and joint space narrowing (JSN) were assessed by two independent, blinded readers. Joint erosion was assessed in 16 joints in each hand/wrist and 6 joints in each foot. Each joint was scored from 0 (no erosion) to 5 for hands/wrists or to 10 for feet (complete collapse). The total erosion score ranges from 0 to 280 (worst). JSN was assessed in 15 joints of each hand and wrist, and 6 joints of each foot, including subluxation, from 0 (normal) to 4 (complete loss of joint space, bony ankylosis, or luxation). The total JSN score ranges from 0 to 168 (worst). The mTSS is the sum of the joint erosion and JSN scores and ranges from 0 (normal) to 448 (worst). A change from Baseline greater than 0 indicates progression. | Baseline to Week 24 | 
| Percentage of Participants With No Radiographic Progression at Week 24 - Japan Sub-study | No radiographic progression is defined as a change from Baseline in mTSS ≤ 0. The mTSS measures the level of joint damage from radiographs of the hands and feet. Joint erosion and joint space narrowing (JSN) were assessed by two independent, blinded readers. Joint erosion severity was assessed in 16 joints in each hand and wrist and 6 joints in each foot. Each joint was scored from 0 (no erosion) to 5 for hands/wrists or to 10 for feet (complete collapse). The total erosion score ranges from 0 to 280 (worst). Joint space narrowing (JSN) was assessed in 15 joints of each hand and wrist, and 6 joints of each foot, including subluxation, from 0 (normal) to 4 (complete loss of joint space, bony ankylosis, or luxation). The total JSN score ranges from 0 to 168 (worst). The mTSS is the sum of the joint erosion and JSN scores and ranges from 0 (normal) to 448 (worst). | Week 24 | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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Musculoskeletal disease, Arthritis, Joint disease, Anti-inflammatory agents, Antirheumatic agents, ABT-494, Upadacitinib