| 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 |  | 
| E.1.1.2 | Therapeutic area | Diseases [C] - Immune System Diseases [C20] | 
| MedDRA Classification | 
| 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 | 
| Determining the GC-sparing effect of RTX by assessing the proportion of PMR patients with GC-free remission and GC cumulative dose after 20 weeks |  | 
| E.2.2 | Secondary objectives of the trial | 
| Assessing the effect of 1* 1000 mg RTX on disease activity in PMR patients by determining the change of ESR and CRP, PMR-AS, inner core domain set as proposed by the OMERACT, SF-36, EQ5D-5L, HAQ-DI from baseline to 20 weeks; Assessing biomarkers such as B-cells, BAFF, IL-6, T-cells and anti-ferritin antibodies and RTX antibodies;
 Determining the frequency and types of GC-related adverse events during the study by using the GTI
 Determining the frequency and types of GC- and RTX-related adverse events during the study
 
 |  | 
| E.2.3 | Trial contains a sub-study | No | 
| E.3 | Principal inclusion criteria | 
| ·PMR according to the ACR/EULAR 2012 PMR core classification criteria ·Signed written informed consent
 
 |  | 
| E.4 | Principal exclusion criteria | 
| ·Not being able to speak, read or write Dutch ·PMR diagnosed >4 weeks before inclusion in the study
 ·Exposure to GC or other immunosuppressant treatments in the past 3 months
 ·Known concomitant GCA or other rheumatic diseases such as RA, spondylarthropathies, connective tissue diseases, drug-induced myopathies, active and untreated thyroid disorders, Parkinson disorder or fibromyalgia
 ·Previous hypersensitivity for prednisone, RTX or murine peptides
 ·Contra-indications to RTX such as active current infection, including hepatitis B or tuberculosis infection, state of severe immunodeficiency, severe heart failure (NYHA-class IV)
 
 |  | 
| E.5 End points | 
| E.5.1 | Primary end point(s) | 
| The proportion of PMR patients in GC-free remission. |  | 
| E.5.1.1 | Timepoint(s) of evaluation of this end point |  | 
| E.5.2 | Secondary end point(s) | 
| -GC cumulative dose -The change of ESR and CRP, PMR-AS, inner core domain set as proposed by the OMERACT, SF-36, EQ5D-5L, HAQ-DI from baseline to 20 weeks;
 -Assessing biomarkers such as B-cells, BAFF, IL-6, T-cells and anti-ferritin antibodies and RTX antibodies;
 -The frequency and types of GC-related adverse events during the study measured using the GTI;
 -The frequency and types of GC- and RTX-related adverse events during the study.
 
 |  | 
| 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 | No | 
| 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.8.3 | 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 | No | 
| E.8.6 Trial involving sites outside the EEA | 
| E.8.6.1 | Trial being conducted both within and outside the EEA | No | 
| E.8.6.2 | Trial being conducted completely outside of the EEA | No | 
| 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 | 
| 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 |  | 
| E.8.9.1 | In the Member State concerned days |  |