| E.1 Medical condition or disease under investigation | 
| E.1.1 | Medical condition(s) being investigated | 
| X-Linked Retinitis Pigmentosa caused by mutations in the RPGR gene |  
| Retinitis pigmentosa ligada al cromosoma X causada por mutaciones en el gen RPGR |  | 
| E.1.1.1 | Medical condition in easily understood language | 
| Progressive reduction in vision, starting with night blindness and progressing to visual field constriction, caused by mutations on Chromosome X (RPGR gene). |  
| Reducción progresiva de la visión, comenzando con ceguera nocturna y progreso a restricción del campo visual, causado por mutaciones en el cormosoma X (gen RPGR) |  | 
| E.1.1.2 | Therapeutic area | Diseases [C] - Eye Diseases [C11] | 
| 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 | 10038914 |  
| E.1.2 | Term | Retinitis pigmentosa |  
| 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 | 
| To assess the long-term safety of AAV5-hRKp.RPGR in individuals with RPGR-XLRP To assess the long-term efficacy of treatment with AAV5-hRKp.RPGR in individuals with RPGR-XLRP based on assessments of retinal function.
 |  
| Evaluar la seguridad a largo plazo de AAV5-hRKp.RPGR en personas con RPGR-XLRP Evaluar la eficacia a largo plazo del tratamiento con AAV5-hRKp.RPGR en personas con RPGR-XLRP según las evaluaciones de la función retiniana
 |  | 
| E.2.2 | Secondary objectives of the trial | 
| To assess changes in all participants after treatment in: retinal function, functional vision, visual function and to assess the safety and tolerability of bilateral subretinal delivery of AAV5-hRKp.RPGR. |  
| Evaluar los cambios después del tratamiento en todos los participantes, con respecto a función retiniana, visión funcional, función visual y evaluar la seguridad y tolerabilidad de la administración subretiniana bilateral de AAV5-hRKp.RPGR |  | 
| E.2.3 | Trial contains a sub-study | No | 
| E.3 | Principal inclusion criteria | 
| 1.Previously completed participation in Study MGT-RPGR-021. 2.Must reconfirm that he or she understands the purpose of, and procedures required for, the study and is willing to participate in the study.
 |  
| 1. Participación previamente completada en el estudio MGT-RPGR-021. 2. Debe volver a confirmar que entiende el propósito y los procedimientos exigidos para el estudio, y que está dispuesto a participar en el estudio.
 |  | 
| E.4 | Principal exclusion criteria | 
| There are no specific exclusion criteria. |  
| No hay criterios de exclusión específicos |  | 
| E.5 End points | 
| E.5.1 | Primary end point(s) | 
| Efficacy: Change in retinal sensitivity by pointwise comparison of individual loci in a 185-point customized grid over 60 months |  
| Eficacia: Cambios en la sensibilidad retiniana mediante la comparación puntual de loci individuales en una cuadrícula personalizada de 185 puntos después de la administración subretiniana bilateral durante 60 meses |  | 
| E.5.1.1 | Timepoint(s) of evaluation of this end point | 
| For participants in the long-term follow-up group; (Month 18, 24, 36, 48, and 60) For participants in the MGT-RPGR-022 treatment group, from baseline to week 52; and follow up at Months 18, 24, 36, 48 and 60.
 |  
| Para los participantes en el grupo de seguimiento de seguridad a largo plazo; (mes 18, 24m 36, 48 y 60) Para participantes en el grupo de tratamiento MGT-RPGR-022, desde el valor de referencia a semana 52; y seguimiento en el mes  8, 24, 36, 48 y 60
 |  | 
| E.5.2 | Secondary end point(s) | 
| Major secondary efficacy endpoints will include the following: •Retinal Function assessed by
 -Static perimetry: V30 from Visual Field Modeling Analysis (VFMA) modeling
 -Average threshold by microperimetry, under mesopic condition
 •Functional Vision assessed by
 -visual mobility assessment
 -Impact of Vision Impairment on Adults (IVI-A) – Reading and Accessing Information domain score – for adults (age 18 years and older)
 •Visual Function assessed by
 -Low luminance BCVA by ETDRS chart letter score
 -Contrast sensitivity by Pelli-Robson chart in LogMAR
 |  
| Los criterios de valoración orincipales incluirán los siguiente: • Función retiniana evaluada por
 -V30 mediante análisis de modelado de campo visual (VFMA),
 - umbral promedio de microperimetría en condiciones mesópicas
 • Visión funcional evaluada por
 - evaluación de movilidad visual.
 - Impacto de la insuficiencia visual en adultos (IVI-A)- Puntuación del
 dominio lectura y acceso a la información - para adultos (mayores de 18 años)
 • Función visual evaluada por
 - Baja luminancia BCVA según la puntuación de las letras del gráfico
 ETDRS
 - Sensibilidad al contraste según la gráfica de Pelli-Robson en LogMAR
 |  | 
| E.5.2.1 | Timepoint(s) of evaluation of this end point | 
| Major secondary efficacy endpoints up to 60 months |  
| Criterios de valoración secundarios principales hasta los 60 meses |  | 
| 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 | Yes | 
| 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 | Yes | 
| E.8.1.7.1 | Other trial design description | 
| Grp tratamiento aplazado y seguridad largo plazo.Esfuerzos enmascarar evaluadores de vision |  
| Deferred treatment grp & long-term safety. Efforts to mask vision assessors to treatment assignment |  | 
| 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 | 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 | 1 | 
| E.8.5 | The trial involves multiple Member States | Yes | 
| E.8.5.1 | Number of sites anticipated in the EEA | 14 | 
| 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 | 
| Canada |  
| Israel |  
| United States |  
| Belgium |  
| Denmark |  
| France |  
| Germany |  
| Ireland |  
| Italy |  
| Netherlands |  
| Spain |  
| Switzerland |  
| United Kingdom |  | 
| 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 | 
| LVLS |  
| Última visita del último paciente |  | 
| 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 | 9 | 
| E.8.9.1 | In the Member State concerned days | 0 | 
| E.8.9.2 | In all countries concerned by the trial years | 5 | 
| E.8.9.2 | In all countries concerned by the trial months | 9 | 
| E.8.9.2 | In all countries concerned by the trial days | 0 |