| E.1 Medical condition or disease under investigation | 
| E.1.1 | Medical condition(s) being investigated |  | 
| E.1.1.1 | Medical condition in easily understood language | 
| Rheumatoid Arthritis is a chronic inflammatory disease causing pain and swelling in the joints. The cause of the disease is unknown. In addition, the disease can involve other tissues of the body. |  | 
| E.1.1.2 | Therapeutic area | Diseases [C] - Musculoskeletal Diseases [C05] | 
| MedDRA Classification | 
| E.1.2 Medical condition or disease under investigation | 
| 
| E.1.2 | Version | 20.0 |  
| 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 |  | 
| 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 | 
| The primary objective of this study is to compare the treatment efficacy between adalimumab-Pfizer and adalimumab-EU in subjects with moderately to severely active RA who are treated with adalimumab in combination with methotrexate. |  | 
| E.2.2 | Secondary objectives of the trial | 
| - To evaluate the overall safety and tolerability of adalimumab-Pfizer and adalimumab-EU. - To evaluate the immunogenicity of adalimumab-Pfizer and adalimumab-EU.
 - To evaluate multiple composite and individual parameters of clinical response to adalimumab-Pfizer and adalimumab-EU.
 - To evaluate the overall safety, tolerability and immunogenicity of adalimumab-Pfizer after treatment transition from adalimumab-EU to adalimumab-Pfizer.
 - To evaluate the population pharmacokinetics (PK) of adalimumab-Pfizer and adalimumab-EU.
 - To evaluate the pharmacodynamic (PD) response to adalimumab-Pfizer and adalimumab-EU.
 |  | 
| E.2.3 | Trial contains a sub-study | No | 
| E.3 | Principal inclusion criteria | 
| - Diagnosis of rheumatoid arthritis based on 2010 ACR/EULAR criteria for at least 4 months. - At least 6 tender (of 68 assessed) and 6 swollen (of 66 assessed) joints at screening and baseline.
 - Hs-CRP equal or greater than 8 mg/L.
 - Must have received methotrexate for at least 12 weeks and been on a stable dose for at least 4 weeks prior to the first study dose.
 
 |  | 
| E.4 | Principal exclusion criteria | 
| - Evidence of untreated or inadequately treated latent or active TB. - Evidence of uncontrolled, clinically significant diseases, including moderate or severe heart failure (NYHA Class III/IV) or malignancy in the previous 5 years.
 - History of infection requiring hospitalization or parenteral antimicrobial therapy within 6 months prior to first dose of study drug.
 - May have received no more than 2 doses of one biologic therapy (other than adalimumab or lymphocyte depleting therapy).
 - Any second DMARD (Disease modifying anti-rheumatic drug) must be washed out prior to the first study dose.
 |  | 
| E.5 End points | 
| E.5.1 | Primary end point(s) | 
| Number of Participants With an American College of Rheumatology 20% (ACR20) Response |  | 
| E.5.1.1 | Timepoint(s) of evaluation of this end point |  | 
| E.5.2 | Secondary end point(s) | 
| - Number of Participants With an American College of Rheumatology 20% (ACR20) Response - Number of Participants Achieving American College of Rheumatology 50% (ACR50) Response
 - Number of Participants Achieving American College of Rheumatology 70% (ACR70) Response
 - Disease Activity Score Based on 28-joints Count (DAS28)-4(CRP)
 - DAS Remission (≤2.6)
 - EULAR Response
 - Change from baseline in individual components of ACR response
 - Incidence and titers of anti-drug antibodies (ADA) and neutralizing antibodies (Nab)
 - Serum drug concentration
 - Type, incidence, severity, timing, seriousness and relatedness of  events (AEs) and laboratory abnormalities.
 |  | 
| E.5.2.1 | Timepoint(s) of evaluation of this end point |  | 
| 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 | No | 
| 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 | No | 
| 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 | 
| Immunogenicity, biosimilar
 |  | 
| 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) | No | 
| E.7.3 | Therapeutic confirmatory (Phase III) | Yes | 
| 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 | Yes | 
| 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) | Yes | 
| E.8.2.2 | Placebo | No | 
| E.8.2.3 | Other | No | 
| E.8.2.4 | Number of treatment arms in the trial | 2 | 
| 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 | 5 | 
| E.8.5 | The trial involves multiple Member States | Yes | 
| E.8.5.1 | Number of sites anticipated in the EEA | 115 | 
| 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 | 
| Argentina |  
| Australia |  
| Bosnia and Herzegovina |  
| Brazil |  
| Bulgaria |  
| Canada |  
| Colombia |  
| Croatia |  
| Czech Republic |  
| Estonia |  
| France |  
| Georgia |  
| Germany |  
| Hungary |  
| Japan |  
| Korea, Republic of |  
| Lithuania |  
| Mexico |  
| New Zealand |  
| Peru |  
| Poland |  
| Russian Federation |  
| Serbia |  
| South Africa |  
| Spain |  
| Taiwan |  
| Ukraine |  
| United Kingdom |  
| United States |  | 
| 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 |  | 
| 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 | 10 | 
| E.8.9.1 | In the Member State concerned days | 0 | 
| E.8.9.2 | In all countries concerned by the trial years | 3 | 
| E.8.9.2 | In all countries concerned by the trial months | 2 | 
| E.8.9.2 | In all countries concerned by the trial days | 0 |