| 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  | 
 | 
| E.1.1.2 | Therapeutic area  | Diseases [C] - Congenital, Hereditary, and Neonatal Diseases and Abnormalities [C16] | 
| MedDRA Classification | 
| 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  | 
| Evaluate the impact of afamelanotide on UV-induced DNA damage and repair capacity in patients with XP | 
 
 
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| E.2.2 | Secondary objectives of the trial  | 
• Evaluate the safety and tolerability of afamelanotide in patients with XP • Evaluate the impact of afamelanotide on the skin disease severity of patients with XP • Evaluate the impact of afamelanotide on the skin melanin density of patients with XP • Evaluate the impact of afamelanotide on the quality of life of patients with XP | 
 
 
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| E.2.3 | Trial contains a sub-study  |  No  | 
| E.3 | Principal inclusion criteria  | 
- Male or female patient with a molecular-genetically confirmed diagnosis of XPC. - Aged 18-75 years. - Providing written Informed Consent prior to the performance of any study-specific procedure. - Willing and able to comply with the conditions specified in the protocol and study procedures, in the opinion of the Investigator. | 
 
 
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| E.4 | Principal exclusion criteria | 
- Known allergy to afamelanotide or the polymer contained in the implant or to lignocaine/ lidocaine or other local anaesthetic to be used during the administration of the implant, if applicable. - Presence of severe hepatic disease. - Hepatic impairment. - Renal impairment. - Any other medical condition which may interfere with the study protocol. - Existing melanoma - Female who is pregnant (confirmed by positive urine β-HCG pregnancy test) or lactating. - Females of child-bearing potential (pre-menopausal, not surgically sterile) not using adequate contraceptive measures (i.e. oral contraceptives, diaphragm plus spermicide, intrauterine device) or a lifestyle excluding pregnancy, for up to three months after the last implant administration. - Sexually active man with a partner of child-bearing potential (premenopausal, not surgically sterile) who is not using adequate contraceptive measures, as described above. - Use of any other prior and concomitant therapy which may interfere with the objective of the study, within 30 days prior to the Screening visit. - Participation in a clinical trial for an investigational agent within 30 days prior to the Screening visit. - Not suitable for trial participation in the opinion of the Investigator | 
 
 
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| E.5 End points | 
| E.5.1 | Primary end point(s) | 
• The changes in UV-induced DNA damage and repair capacity from baseline Day 0 to Day 43 or Premature Termination Visit (if applicable), as measured through analysis of UV photoproducts and DNA repair mechanisms on exposed skin in comparison with non-exposed skin (refer to the biopsy protocol for details). | 
 
 
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| E.5.1.1 | Timepoint(s) of evaluation of this end point | 
 | 
| E.5.2 | Secondary end point(s) | 
 | 
| E.5.2.1 | Timepoint(s) of evaluation of this end point | 
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| 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 |  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 |  | 
| 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 months | 7 |