| E.1 Medical condition or disease under investigation | 
| E.1.1 | Medical condition(s) being investigated  | 
| Moderate to Severe Rheumatoid Arthritis | 
 
 
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| E.1.1.1 | Medical condition in easily understood language  | 
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| E.1.1.2 | Therapeutic area  | Diseases [C] - Immune System Diseases [C20] | 
| MedDRA Classification | 
| E.1.2 Medical condition or disease under investigation | 
| E.1.2 | Version  | 23.1 | 
 
| E.1.2 | Level  | PT | 
 
| E.1.2 | Classification code  | 10039073 | 
 
| E.1.2 | Term  | Rheumatoid arthritis | 
 
| E.1.2 | System Organ Class  | 10028395 - Musculoskeletal and connective tissue disorders | 
 
 
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| E.1.3 | Condition being studied is a rare disease  |  No  | 
| E.2 Objective of the trial | 
| E.2.1 | Main objective of the trial  | 
| To assess the safety, tolerability, and efficacy of ABBV-154 administered every other week (eow) and every 4 weeks (e4w) subcutaneously (SC) vs placebo in subjects with moderately to severely active RA with inadequate response to at least one prior b/tsDMARD. | 
 
 
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| E.2.2 | Secondary objectives of the trial  | 
| To assess the pharmacokinetics (PK), pharmacodynamics, and immunogenicity of ABBV 154.  | 
 
 
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| E.2.3 | Trial contains a sub-study  |  No  | 
| E.3 | Principal inclusion criteria  | 
1. Clinical diagnosis of rheumatoid arthritis(RA) with fulfillment of the 2010 ACR/European League Against Rheumatism (EULAR) classification criteria for RA. 2. Participant has ≥ 6 swollen joints (based on 66 joint count) and ≥ 6 tender joints (based on 68 joint count) at baseline. 3. Participant must have had an inadequate response to at least one of the following prior b/tsDMARD treatments for RA (or corresponding biosimilar): - Tumor necrosis factor inhibitors: adalimumab, certolizumab pegol, etanercept, golimumab, infliximab - Interleukin-1 receptor inhibitors: anakinra - Interleukin-6 receptor inhibitors: tocilizumab, sarilumab - CD20-directed cytolytic antibodies: rituximab - T cell costimulation modulators: abatacept - Janus Kinase inhibitors: baricitinib, filgotinib, peficitinib, tofacitinib, upadacitinib - Investigational drug with positive efficacy data available from confirmatory trials, as agreed with the AbbVie TA MD 
 
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| E.4 | Principal exclusion criteria | 
| 1. Participant discontinued prior adalimumab therapy due to intolerability or toxicity. | 
 
 
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| E.5 End points | 
| E.5.1 | Primary end point(s) | 
| Achievement of 50% improvement as measured by American College of Rheumatology response criteria (ACR50) at Week 12. | 
 
 
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| E.5.1.1 | Timepoint(s) of evaluation of this end point | 
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| E.5.2 | Secondary end point(s) | 
1. Change in Disease Activity Score (DAS) 28 (CRP) from Baseline; 2. Change in Clinical Disease Activity Index (CDAI) from Baseline; 3. Achievement of ACR20; 4. Achievement of ACR70; 5. Achievement of Low Disease Activity (LDA) defined by DAS28 (CRP) ≤ 3.2; 6. Achievement of LDA defined by CDAI ≤ 10; 7. Achievement of clinical remission defined by DAS28 (CRP) < 2.6; 8. Achievement of clinical remission defined by CDAI ≤ 2.8; and 9. Change in Health Assessment Questionnaire Disability Index (HAQ-DI) from Baseline | 
 
 
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| E.5.2.1 | Timepoint(s) of evaluation of this end point | 
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| E.6 and E.7 Scope of the trial | 
| E.6 | Scope of the trial | 
| E.6.1 | Diagnosis |  No  | 
| E.6.2 | Prophylaxis |  No  | 
| E.6.3 | Therapy |  Yes  | 
| E.6.4 | Safety |  Yes  | 
| E.6.5 | Efficacy |  Yes  | 
| E.6.6 | Pharmacokinetic |  Yes  | 
| E.6.7 | Pharmacodynamic |  Yes  | 
| E.6.8 | Bioequivalence |  No  | 
| E.6.9 | Dose response |  Yes  | 
| E.6.10 | Pharmacogenetic |  No  | 
| E.6.11 | Pharmacogenomic |  No  | 
| E.6.12 | Pharmacoeconomic |  No  | 
| E.6.13 | Others |  Yes  | 
| E.6.13.1 | Other scope of the trial description | 
| Also assess Immunogenicity of ABBV-154 | 
 
 
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| E.7 | Trial type and phase | 
| E.7.1 | Human pharmacology (Phase I) |  No  | 
| E.7.1.1 | First administration to humans |  No  | 
| E.7.1.2 | Bioequivalence study |  No  | 
| E.7.1.3 | Other |  No  | 
| E.7.1.3.1 | Other trial type description |  | 
| E.7.2 | Therapeutic exploratory (Phase II) |  Yes  | 
| E.7.3 | Therapeutic confirmatory (Phase III) |  No  | 
| E.7.4 | Therapeutic use (Phase IV) |  No  | 
| E.8 Design of the trial | 
| E.8.1 | Controlled |  Yes  | 
| E.8.1.1 | Randomised |  Yes  | 
| E.8.1.2 | Open |  No  | 
| E.8.1.3 | Single blind |  No  | 
| E.8.1.4 | Double blind  |  Yes  | 
| E.8.1.5 | Parallel group |  No  | 
| E.8.1.6 | Cross over  |  No  | 
| E.8.1.7 | Other |  No  | 
| E.8.2 |  Comparator of controlled trial | 
| E.8.2.1 | Other medicinal product(s) |  No  | 
| E.8.2.2 | Placebo  |  Yes  | 
| E.8.2.3 | Other |  No  | 
| E.8.2.4 | Number of treatment arms in the trial | 5 | 
| E.8.3 | 
                                The trial involves single site in the Member State concerned
                             |  No  | 
| E.8.4 |  The trial involves multiple sites in the Member State concerned  |  Yes  | 
| E.8.4.1 | Number of sites anticipated in Member State concerned | 6 | 
| E.8.5 | The trial involves multiple Member States |  Yes  | 
| E.8.5.1 | Number of sites anticipated in the EEA | 50 | 
| E.8.6 Trial involving sites outside the EEA | 
| E.8.6.1 | Trial being conducted both within and outside the EEA |  Yes  | 
| E.8.6.2 | Trial being conducted completely outside of the EEA |  No  | 
| E.8.6.3 | If E.8.6.1 or E.8.6.2 are Yes, specify the regions in which trial sites are planned | 
| Australia | 
 
| Canada | 
 
| Israel | 
 
| Japan | 
 
| Korea, Republic of | 
 
| New Zealand | 
 
| Puerto Rico | 
 
| Taiwan | 
 
| United States | 
 
| Poland | 
 
| Netherlands | 
 
| Spain | 
 
| Czechia | 
 
| Germany | 
 
| Greece | 
 
| Italy | 
 
| Hungary | 
 
| Russian Federation | 
 
| Slovakia | 
 
| Turkey | 
 
| Ukraine | 
 
| United Kingdom | 
 
 
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| E.8.7 | Trial has a data monitoring committee |  Yes  | 
| E.8.8 | 
                        Definition of the end of the trial and justification where it is not the last
                        visit of the last subject undergoing the trial
                     | 
The end-of-study is defined as 70 days after the last study drug administration. 
 | 
 
 
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| E.8.9 Initial estimate of the duration of the trial | 
| E.8.9.1 | In the Member State concerned years | 2 | 
| E.8.9.1 | In the Member State concerned months | 11 | 
| E.8.9.1 | In the Member State concerned days | 15 | 
| E.8.9.2 | In all countries concerned by the trial years | 2 | 
| E.8.9.2 | In all countries concerned by the trial months | 11 | 
| E.8.9.2 | In all countries concerned by the trial days | 15 |