| E.1 Medical condition or disease under investigation | 
| E.1.1 | Medical condition(s) being investigated  | 
SLE Sub-protocol: Systemic Lupus Erythematosus
 pSS Sub-protocol: Primary Sjögren’s Syndrome
 RA Sub-protocol: Rheumatoid Arthritis | 
 
 
 | 
| E.1.1.1 | Medical condition in easily understood language  | 
| Lupus, Sjögren’s Syndrome and Arthritis are autoimmune diseases that develops when body's immune system overreacts to unknown stimulus making antibodies/proteins directed against own's body tissues.  | 
 
 
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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  | 21.1 | 
 
| E.1.2 | Level  | PT | 
 
| E.1.2 | Classification code  | 10042945 | 
 
| E.1.2 | Term  | Systemic lupus erythematosus | 
 
| E.1.2 | System Organ Class  | 10028395 - Musculoskeletal and connective tissue disorders | 
 
 
 | 
| E.1.2 Medical condition or disease under investigation | 
| E.1.2 | Version  | 21.0 | 
 
| E.1.2 | Level  | PT | 
 
| E.1.2 | Classification code  | 10040767 | 
 
| E.1.2 | Term  | Sjogren's syndrome | 
 
| E.1.2 | System Organ Class  | 10028395 - Musculoskeletal and connective tissue disorders | 
 
 
 | 
| E.1.2 Medical condition or disease under investigation | 
| E.1.2 | Version  | 21.0 | 
 
| 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  | 
SLE Sub-protocol: 
 -To compare the efficacy of branebrutinib with PBO at Week 24 in the treatment of subjects with SLE
 
 pSS Sub-protocol: 
 -To compare the efficacy of branebrutinib with PBO at Week 24 in the treatment of subjects with pSS
 
 RA Sub-protocol:
 -To compare the efficacy of branebrutinib with PBO at Week 12 in the treatment of subjects with moderate to severe RA on a stable background of MTX who have had an inadequate response to MTX | 
 
 
 | 
| E.2.2 | Secondary objectives of the trial  | 
SLE Sub-protocol:
 -To compare the efficacy of branebrutinib with PBO at Week 24 in the treatment of subjects with SLE.
 -To compare the efficacy of branebrutinib with PBO on measures of global and organ-specific clinical responses at Week 24 in the treatment of  subjects with SLE.
 - To compare the safety and tolerability of branebrutinib with PBO in subjects with SLE.
 
 pSS Sub-protocol:
 -To compare the safety and tolerability of branebrutinib with PBO in subjects with pSS.
 
 RA Sub-protocol:
 -To compare the efficacy of branebrutinib with PBO at Week 12 in the treatment of subjects with moderate to severe RA on a stable background of MTX who have had an inadequate response to MTX.
 - To evaluate the safety and tolerability at Week 24 of switching at Week 12 from branebrutinib or PBO to abatacept in subjects with RA.
 
 | 
 
 
 | 
| E.2.3 | Trial contains a sub-study  |  No  | 
| E.3 | Principal inclusion criteria  | 
Sub-Protocol for Systemic Lupus Erythematosus (SLE):
 - Active SLE as defined by the Systemic Lupus Erythematosus International Collaborating Clinics (SLICC) classification.
 - Diagnosed with SLE more than 24 weeks before screening visit.
 
 Sub-Protocol for primary Sjögren's Syndrome (pSS):
 - Moderate to severe pSS, meeting ACR-EULAR classification criteria.
 
 Sub-Protocol for active Rheumatoid Arthritis (RA):
 - Moderate to severe adult-onset RA.
 - ACR global functional status class I to III.
 
 For all sub-studies:
 - Women and men must agree to follow instructions for methods of contraception.
 
 Please, be referred to the Protocol document for a complete list of Inclusion citeria. | 
 
 
 | 
| E.4 | Principal exclusion criteria | 
Sub-Protocol for Systemic Lupus Erythematosus (SLE):
 - Certain other autoimmune diseases and overlap syndromes.
 
 Sub-Protocol for primary Sjögren's Syndrome (pSS):
 - Certain other immune-mediated diseases, active fibromyalgia, or other medical conditions.
 
 Sub-Protocol for Rheumatoid Arthritis (RA):
 - Diagnosis with juvenile arthritis or idiopathic arthritis before age 16.
 
 For all sub-studies:
 - History of any significant drug allergy
 - Active infection, significant concurrent medical condition, or clinically significant abnormalities
 
 Please, be referred to the Protocol document for a complete list of Exclusion citeria. | 
 
 
 | 
| E.5 End points | 
| E.5.1 | Primary end point(s) | 
1. SLE: mCLASI activity score response [ Time Frame: at 24 weeks ]
 Proportion of participants with a ≥ 50% reduction of mCLASI from baseline
 
 2. pSS: Proportion of subjects with changes in a composite score that includes ESSPRI (EULAR Sjögren's Syndrome Patient Reported Index), ESSDAI (EULAR Sjögren's Syndrome Disease Activity Index), ocular staining, salivary flow and serological marker [ Time Frame: at 24 weeks ]
 Clinically significant improvements from baseline in ESSPRI, ESSDAI, ocular staining, salivary flow, and serological marker (rheumatoid factor [RF], IgG, complement C3 or C4, cryoglobulin) used in the composite measure.
 
 3. RA: ACR50 response [ Time Frame: at 12 weeks ]
 Proportion of participants achieving ACR50 response (American College of Rheumatology 50 criteria) | 
 
 
 | 
| E.5.1.1 | Timepoint(s) of evaluation of this end point | 
SLE Sub-Protocol:
 -Week 20 and Week 24
 pSS Sub-Protocol:
 - Week 24
 RA Sub-protocol:
 -Week 12 | 
 
 
 | 
| E.5.2 | Secondary end point(s) | 
1. SLE: SLEDAI-2K score response [ Time Frame: at 24 weeks ]
 Change from baseline in SLEDAI-2K score (Systemic Lupus Erythematosus Disease Activity Index 2000)
 
 2. SLE: BILAG-based Composite Lupus Assessment response [ Time Frame: at 24 weeks ]
 Change from baseline in BILAG-based (British Isles Lupus Assessment Group) Composite Lupus Assessment response
 
 3. RA: DAS28-CRP response [ Time Frame: at 12 weeks ]
 Change from baseline in DAS28-CRP (Disease Activity Score 28 - C reactive protein)
 
 4. RA: DAS28-ESR response [ Time Frame: at 12 weeks ]
 Change from baseline in DAS28-ESR (Disease Activity Score 28 - Erythrocyte Sedimentation Rate)
 
 5. RA: SDAI response [ Time Frame: at 12 weeks ]
 Change from baseline in SDAI (Simplified Disease Activity Index)
 
 6. RA: CDAI response [ Time Frame: at 12 weeks ]
 Change from baseline in CDAI (Clinical Disease Activity Index)
 
 7. RA: ACR20 response [ Time Frame: at 12 weeks ]
 Proportion of participants achieving ACR20 response (American College of Rheumatology 20 criteria)
 
 8. RA: ACR70 response [ Time Frame: at 12 weeks ]
 Proportion of participants achieving ACR70 response (American College of Rheumatology 70 criteria)
 
 9. SLE, pSS, RA: Safety [ Time Frame: up to 28 weeks ]
 Incidence of Serious Adverse Events, Adverse Events; number of clinically significant changes in lab assessment of blood, number of clinically significant changes in vital sign of body temperature, blood pressure, and respiratory rate; number of clinically significant changes in electrocardiogram. | 
 
 
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| E.5.2.1 | Timepoint(s) of evaluation of this end point | 
SLE Sub-protocol:
 -Week 24
 -Week 28 (safety)
 
 pSS Sub-protocol:
 -Week 24
 -Week 28 (safety)
 
 RA Sub-protocol:
 -Week 12 
 -Week 28 (safety) | 
 
 
 | 
| 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 |  No  | 
| E.6.10 | Pharmacogenetic |  Yes  | 
| E.6.11 | Pharmacogenomic |  Yes  | 
| E.6.12 | Pharmacoeconomic |  No  | 
| E.6.13 | Others |  No  | 
| 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 |  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) |  No  | 
| E.8.2.2 | Placebo  |  Yes  | 
| E.8.2.3 | Other |  No  | 
| E.8.2.4 | Number of treatment arms in the trial | 7 | 
| 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 | 35 | 
| 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 | 
 
| Belgium | 
 
| France | 
 
| Germany | 
 
| Mexico | 
 
| Netherlands | 
 
| Poland | 
 
| Spain | 
 
| 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
                     | 
SLE Sub-protocol/pSS Sub-protocol/RA Sub-protocol: 
 -Final date  on which data for the primary endpoint was or is expected to be collected, if it is not the same.
 
 
 | 
 
 
 | 
| 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 | 6 | 
| E.8.9.1 | In the Member State concerned days | 0 | 
| 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 | 6 | 
| E.8.9.2 | In all countries concerned by the trial days | 0 |