| E.1 Medical condition or disease under investigation | 
| E.1.1 | Medical condition(s) being investigated | 
| Muckle-Wells Syndrome (Autoinflammatory Disease) |  | 
| E.1.1.1 | Medical condition in easily understood language | 
| Muckle Wells Syndrome is an inflammatory disorder caused by the body making too much of a protein called interleukin 1β (IL-1β). Symptoms include redness, swelling, pain, fever and loss of hearing. |  | 
| 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 | 14.1 |  
| E.1.2 | Level | PT |  
| E.1.2 | Classification code | 10064569 |  
| E.1.2 | Term | Muckle-Wells syndrome |  
| E.1.2 | System Organ Class | 10010331 - Congenital, familial and genetic disorders |  | 
| E.1.3 | Condition being studied is a rare disease | Yes | 
| E.2 Objective of the trial | 
| E.2.1 | Main objective of the trial | 
| This study is designed to provide efficacy and safety data for ACZ885 (a fully human anti-interleukin-1beta (anti-IL-1beta) monoclonal antibody) administered as an injection subcutaneously (s.c.) in patients with Muckle-Wells Syndrome. Part I is an 8-week open-label, active treatment period to identify ACZ885 responders.
 Part II is a double-blind, placebo-controlled period to assess primarily the efficacy of ACZ885 compared to placebo.
 Part III is an open-label, active treatment period where patients will receive ACZ885 every 8 weeks after withdrawal or completion of Part II.
 |  | 
| E.2.2 | Secondary objectives of the trial |  | 
| E.2.3 | Trial contains a sub-study | No | 
| E.3 | Principal inclusion criteria | 
| •Molecular diagnosis of NALP3 mutations and clinical picture resembling Muckle-Wells Syndrome. •Muckle-Wells Syndrome patients who participated in the CACZ885A2102 study will have the option to participate in this study upon disease flare
 •Muckle-Wells Syndrome patients requiring medical intervention either untreated or treated (i.e. under ACZ885, anakinra, or any other investigational IL-1 blocking therapy).
 
 Other protocol-defined inclusion criteria may apply.
 |  | 
| E.4 | Principal exclusion criteria | 
| •History of being immunocompromised, including a positive HIV at screening test result. •No live vaccinations within 3 months prior to the start of the trial, during the trial, and up to 3 months following the last dose.
 •History of significant medical conditions, which in the Investigator's opinion would exclude the patient from participating in this trial.
 •History of recurrent and/or evidence of active bacterial, fungal, or viral infections.
 •Positive tuberculin skin test at 48 to 72 hours after administration at the screening visit or within 2 months prior to the screening visit, according to national guidelines.
 
 Other protocol-defined exclusion criteria may apply
 |  | 
| E.5 End points | 
| E.5.1 | Primary end point(s) | 
| 1. Percent of Participants With Disease Flare in Part II (After 24 Weeks of the Double-blind Part) 2. Number of Participants Who Experienced a Disease Flare in Part II
 |  | 
| E.5.1.1 | Timepoint(s) of evaluation of this end point | 
| 32 weeks after study start |  | 
| E.5.2 | Secondary end point(s) | 
| 1. Number of Participants With Treatment Response in Part I (After 8 Weeks) 2. Investigator's Clinical Assessment of Autoinflammatory Disease Activity & Participant's Assessment of Symptoms at End of Part II (After 24 Weeks of the Double-blind Part)
 3. Change in Inflammation Markers at the End of Part II (C-reactive Protein and/or Serum Amyloid A) (After 24 Weeks of the Double-blind Part) From Week 8.
 4. Pharmacokinetics (CLD (L/d))
 5. Pharmacodynamics Measured by Interleukin-1β (IL-1β) Concentrations at End of Part I.
 6. Pharmacodynamics Measured by Interleukin-1β (IL-1β) Concentrations at End of Part II.
 7. Pharmacodynamics Measured by Interleukin-1β (IL-1β) Concentrations at End of Part III.
 |  | 
| E.5.2.1 | Timepoint(s) of evaluation of this end point | 
| 1. 8 weeks after study start 2. 32 weeks after study start
 3. Week 8 and Week 32
 4. 48 weeks after study start
 5. until Week 8
 6. 32 weeks after study start
 7. 48 weeks after study start
 |  | 
| 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 | Yes | 
| E.6.11 | Pharmacogenomic | Yes | 
| E.6.12 | Pharmacoeconomic | Yes | 
| E.6.13 | Others | Yes | 
| E.6.13.1 | Other scope of the trial description | 
| Immunogenicity assessment |  | 
| 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 | No | 
| E.8.1.6 | Cross over | No | 
| E.8.1.7 | Other | Yes | 
| E.8.1.7.1 | Other trial design description | 
| Randomised withdrawal design. Double blind in Part II. |  | 
| 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.8.3 | Will this trial be conducted at a single site globally? | No | 
| E.8.4 | Will this trial be conducted at multiple sites globally? | Yes | 
| E.8.6 Trial involving sites outside the EEA | 
| E.8.6.2 | Trial being conducted completely outside of the EEA | No | 
| E.8.6.3 | Specify the countries outside of the EEA in which trial sites are planned |  | 
| E.8.7 | Trial has a data monitoring committee | No | 
| 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.8.9.2 | In all countries concerned by the trial years | 1 | 
| E.8.9.2 | In all countries concerned by the trial months | 6 |