| E.1 Medical condition or disease under investigation | 
| E.1.1 | Medical condition(s) being investigated | 
| Multicentric Castleman's Disease |  | 
| E.1.1.1 | Medical condition in easily understood language | 
| Multicentric Castleman's Disease |  | 
| E.1.1.2 | Therapeutic area | Diseases [C] - Cancer [C04] | 
| MedDRA Classification | 
| E.1.2 Medical condition or disease under investigation | 
| 
| E.1.2 | Version | 17.0 |  
| E.1.2 | Level | PT |  
| E.1.2 | Classification code | 10050251 |  
| E.1.2 | Term | Castleman's disease |  
| E.1.2 | System Organ Class | 10029104 - Neoplasms benign, malignant and unspecified (incl cysts and polyps) |  | 
| 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 | 
| The primary objective is to evaluate the long-term safety of siltuximab in subjects with MCD. |  | 
| E.2.2 | Secondary objectives of the trial | 
| - To determine the proportion of previously responding subjects who maintain disease control - To determine the proportion of siltuximab-naive subjects who experience disease control
 - To describe the duration of disease control and survival
 - To assess reliability of a multicentric Castleman’s disease symptom scale (MCDSS)
 - To evaluate IL-6 levels
 - To assess formation of antibodies to siltuximab (immunogenicity) after long-term treatment in the MCD population
 |  | 
| E.2.3 | Trial contains a sub-study | No | 
| E.3 | Principal inclusion criteria | 
| - Have multicentric Castleman's disease - Have previously been enrolled in Study C0328T03 or CNTO328MCD2001 (either treatment arm)
 - Have had their last administration of study treatment (siltuximab or placebo) less than 6 weeks (window of plus 2 weeks) prior to first dose
 - Patients must not have had disease progression while receiving siltuximab. For those patients originally assigned to placebo in the CNTO328MCD2001 study, patients who have received less than 4 months of siltuximab following crossover will also be eligible
 - Have adequate clinical laboratory parameters within 2 weeks prior to the first dose of siltuximab for this study.
 |  | 
| E.4 | Principal exclusion criteria | 
| - Unmanageable toxicity, an adverse event, progression of disease, or withdrawal of consent as reason for discontinuing treatment from previous sponsor-initiated siltuximab study - Vaccination with live, attenuated vaccines within 4 weeks of first dose of this study
 - Known unmanageable allergies, hypersensitivity, or intolerance to monoclonal antibodies or to murine, chimeric, or human proteins or their excipients
 |  | 
| E.5 End points | 
| E.5.1 | Primary end point(s) | 
| Proportion of patients for adverse events as a measure of safety |  | 
| E.5.1.1 | Timepoint(s) of evaluation of this end point |  | 
| E.5.2 | Secondary end point(s) | 
| - Proportion of multicentric Castleman's disease (MCD) patients evaluated for pharmacodynamic biomarkers - Proportion of previously responding MCD patients and siltuximab-naive patients who maintain disease control
 - Duration of MCD disease control and survival
 - Proportion of patients for Multicentric Castleman's Disease Symptom Scale (MCDSS) as a measure of the severity of symptoms
 - Assessment of glycoform clearance analysis
 - Assessment of in vivo protein degradation analysis
 |  | 
| 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 | Yes | 
| E.6.4 | Safety | Yes | 
| E.6.5 | Efficacy | Yes | 
| E.6.6 | Pharmacokinetic | No | 
| 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 | 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 | No | 
| E.8.1.1 | Randomised | No | 
| E.8.1.2 | Open | Yes | 
| E.8.1.3 | Single blind | No | 
| E.8.1.4 | Double blind | No | 
| 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 | No | 
| E.8.2.3 | Other | No | 
| E.8.2.4 | Number of treatment arms in the trial | 1 | 
| E.8.3 | The trial involves single site in the Member State concerned | Yes | 
| E.8.4 | The trial involves multiple sites in the Member State concerned | No | 
| E.8.5 | The trial involves multiple Member States | Yes | 
| E.8.5.1 | Number of sites anticipated in the EEA | 8 | 
| 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 | 
| Belgium |  
| Brazil |  
| Canada |  
| China |  
| Egypt |  
| France |  
| Germany |  
| Hong Kong |  
| Israel |  
| Korea, Republic of |  
| New Zealand |  
| Norway |  
| Singapore |  
| Spain |  
| Taiwan |  
| United Kingdom |  
| United States |  | 
| 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 | 
| The end of study is the date of the last assessment for the last subject (eg, last survival follow-up). |  | 
| E.8.9 Initial estimate of the duration of the trial | 
| E.8.9.1 | In the Member State concerned years | 5 | 
| E.8.9.1 | In the Member State concerned months | 0 | 
| E.8.9.1 | In the Member State concerned days | 0 | 
| E.8.9.2 | In all countries concerned by the trial years | 6 | 
| E.8.9.2 | In all countries concerned by the trial months | 0 | 
| E.8.9.2 | In all countries concerned by the trial days | 0 |