| E.1 Medical condition or disease under investigation | 
| E.1.1 | Medical condition(s) being investigated  | 
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| E.1.1.1 | Medical condition in easily understood language  | 
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| 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  | 10071400 | 
 
| E.1.2 | Term  | Axial spondyloarthritis | 
 
| E.1.2 | System Organ Class  | 10028395 - Musculoskeletal and connective tissue disorders | 
 
 
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| 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  | 
| To assess the superiority of secukinumab 150 mg compared to placebo in achieving a spinal pain score < 4 on a 0-10 numerical rating score (NRS) at Week 8. | 
 
 
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| E.2.2 | Secondary objectives of the trial  | 
| To assess the superiority of secukinumab 150 mg compared to placebo in achieving a Bath Ankylosing Spondylitis Disease Activity Index (BASDAI) score < 4 at Week 8. | 
 
 
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| E.2.3 | Trial contains a sub-study  |  No  | 
| E.3 | Principal inclusion criteria  | 
- Diagnosis of axial spondylarthritis (AxSpA, either ankylosing spondylitis or non radiographic axial spondylarthritis) according to ASAS AxSpA classification criteria.
 - Patients with back pain for at least 3 months and age of onset less than 45 years.
 - Active AxSpA as assessed by total BASDAI score of at least 4 at Baseline.
 - Spinal pain numeric rating scale score of more than 4 at Baseline.
 - Inadequate response to or failure to respond to at least 2 different NSAIDs at the highest recommended dose for at least 4 weeks in total prior to randomization.
 
 Other protocol-defined inclusion criteria may apply. | 
 
 
 | 
| E.4 | Principal exclusion criteria | 
- Chest X-ray or MRI with evidence of ongoing infectious or malignant process.
 - Patients previously treated with any biological immunomodulating agents, except those targeting tumor necrosis factor alpha.
 - Patients who have been exposed to more than one anti-tumor necrosis factor alpha agent.
 - Active ongoing inflammatory diseases other than axial spondyloarthritis.
 - Other ongoing mechanical diseases affecting the spine.
 
 Other protocol-defined exclusion criteria may apply. | 
 
 
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| E.5 End points | 
| E.5.1 | Primary end point(s) | 
| Proportion of patients with a spinal pain NRS score below 4 | 
 
 
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| E.5.1.1 | Timepoint(s) of evaluation of this end point | 
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| E.5.2 | Secondary end point(s) | 
| Proportion of patients with a Bath ankylosing spondylitis disease activity index score below 4 | 
 
 
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| 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 |  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) |  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) |  No  | 
| E.8.2.2 | Placebo  |  Yes  | 
| 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 | 7 | 
| E.8.5 | The trial involves multiple Member States |  Yes  | 
| E.8.5.1 | Number of sites anticipated in the EEA | 93 | 
| 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 | 
 
| Bulgaria | 
 
| Croatia | 
 
| Czech Republic | 
 
| Estonia | 
 
| Finland | 
 
| Germany | 
 
| Greece | 
 
| Ireland | 
 
| Israel | 
 
| Italy | 
 
| Latvia | 
 
| Lithuania | 
 
| Poland | 
 
| Romania | 
 
| Russian Federation | 
 
| Spain | 
 
| Sweden | 
 
| Switzerland | 
 
| United Kingdom | 
 
 
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| 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
                     | 
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| E.8.9 Initial estimate of the duration of the trial | 
| E.8.9.1 | In the Member State concerned years | 1 | 
| E.8.9.1 | In the Member State concerned months | 7 | 
| E.8.9.1 | In the Member State concerned days |  | 
| 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 | 8 |