| E.1 Medical condition or disease under investigation | 
| E.1.1 | Medical condition(s) being investigated  | 
| Paroxysmal Nocturnal Hemoglobinuria (PNH) | 
 
 
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| E.1.1.1 | Medical condition in easily understood language  | 
| Paroxysmal Nocturnal Hemoglobinuria (PNH) | 
 
 
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| E.1.1.2 | Therapeutic area  | Diseases [C] - Blood and lymphatic diseases [C15] | 
| MedDRA Classification | 
| E.1.2 Medical condition or disease under investigation | 
| E.1.2 | Version  | 20.1 | 
 
| E.1.2 | Level  | PT | 
 
| E.1.2 | Classification code  | 10034042 | 
 
| E.1.2 | Term  | Paroxysmal nocturnal haemoglobinuria | 
 
| E.1.2 | System Organ Class  | 10038359 - Renal and urinary disorders | 
 
 
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| 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 purpose of this study is to assess the pharmacokinetics (PK), pharmacodynamics (PD), safety, and efficacy of ALXN1210 in pediatric patients with paroxysmal nocturnal hemoglobinuria (PNH) | 
 
 
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| E.2.2 | Secondary objectives of the trial  | 
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| E.2.3 | Trial contains a sub-study  |  No  | 
| E.3 | Principal inclusion criteria  | 
1. Patients from birth up to < 18 years of age and weighing ≥ 5 kg at the time of consent. 2. PNH diagnosis confirmed by documented by high-sensitivity flow cytometry 3. For patients not currently treated with eculizumab, presence of 1 or more of the following PNH-related signs or symptoms within 3 months of Screening: fatigue, hemoglobinuria, abdominal pain, shortness of breath (dyspnea), anemia (hemoglobin <10 g/dL), history of a major adverse vascular event (including thrombosis), dysphagia, or erectile dysfunction; or history of pRBC transfusion due to PNH. 4. LDH level ≥ 1.5 × ULN for patients not being treated with eculizumab at screening and LDH level ≤ 1.5 × ULN for patients being treated with eculizumab. 5. Documented meningococcal vaccination not more than 3 years prior to dosing, and vaccination against Streptococcus pneumoniae and Haemophilus influenzae  | 
 
 
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| E.4 | Principal exclusion criteria | 
1. Platelet count < 30,000/mm (30x109/L) at screening. 2. Absolute neutrophil count < 500 µL (0.5 x109/L) at screening 3. History of Bone Marrow transplantation 4. History of N. meningitidis infection 5. History of unexplained, recurrent infection | 
 
 
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| E.5 End points | 
| E.5.1 | Primary end point(s) | 
PK/PD parameters (trough and peak)   • PK: maximum serum concentration (Cmax), trough serum concentration (measured at end of dosing interval at steady state; Ctrough), accumulation ratio • PD: change in free C5 concentrations and in chicken red blood cell (cRBC) hemolytic activity over time) 
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| E.5.1.1 | Timepoint(s) of evaluation of this end point | 
| Baseline and Weeks 2, 10, 18, and 26 | 
 
 
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| E.5.2 | Secondary end point(s) | 
- Change in lactate dehydrogenase (LDH) levels - Percentage of patients who achieve transfusion avoidance (TA)  
 
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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 |  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 |  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 |  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
                             |  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 | 1 | 
| E.8.5 | The trial involves multiple Member States |  Yes  | 
| E.8.5.1 | Number of sites anticipated in the EEA | 7 | 
| 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 | 
| France | 
 
| Netherlands | 
 
| United Kingdom | 
 
| United States | 
 
 
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| 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
                     | 
| LVLS in the extension period | 
 
 
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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 | 2 | 
| E.8.9.1 | In the Member State concerned months | 10 | 
| E.8.9.1 | In the Member State concerned days | 0 | 
| E.8.9.2 | In all countries concerned by the trial years | 3 | 
| 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 |