| 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 | 
| Dermatitis as a result of radiation therapy for breast cancer |  | 
| E.1.1.2 | Therapeutic area | Diseases [C] - Injuries, poisonings, and occupational diseases [C21] | 
| MedDRA Classification | 
| E.1.2 Medical condition or disease under investigation | 
| 
| E.1.2 | Version | 20.0 |  
| E.1.2 | Level | LLT |  
| E.1.2 | Classification code | 10061103 |  
| E.1.2 | Term | Dermatitis radiation |  
| E.1.2 | System Organ Class | 10022117 - Injury, poisoning and procedural complications |  | 
| 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 | 10063562 |  
| E.1.2 | Term | Radiation skin injury |  
| E.1.2 | System Organ Class | 10022117 - Injury, poisoning and procedural complications |  | 
| 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 evaluate if melatonin can protect against radiation injury in women receiving radiation therapy as part of their treatment of breast cancer. |  | 
| E.2.2 | Secondary objectives of the trial | 
| To evaluate if melatonin can reduce the useage of steroid cream in the treatment of radiaiton dermatitis. |  | 
| E.2.3 | Trial contains a sub-study | No | 
| E.3 | Principal inclusion criteria | 
| Diagnosed with early breast cancer Over 49 years old
 Have had radical tumor resection surgery
 Follows treatment regimens and follow-up at Rigshospitalet
 Written informed consent after written and verbal information
 |  | 
| E.4 | Principal exclusion criteria | 
| Inability to understand Danish, written or spoken Mental illness*
 Previous therapy with ionizing radiation in the thoracic or neck area
 Use of bolus for radiation therapy**
 
 * Defined as having a diagnosis and being in medical treatment, or if anticipated poor compliance. ** A bolus is a material which has dose absorption properties equivalent to tissue. It is placed on the irradiated area to alter dosing or target of the radiation therapy
 |  | 
| E.5 End points | 
| E.5.1 | Primary end point(s) | 
| RTOG's acute radiation morbidity scoring criteria of the skin Image analysis of clinical photographs after radiation exposure
 EORTC's QLQ-BR23, specifically the breast symptoms
 |  | 
| E.5.1.1 | Timepoint(s) of evaluation of this end point | 
| RTOG's acute radiation morbidity scoring criteria of the skin: Two weeks after last radiation fraction Image analysis of clinical photographs after radiation exposure: Two weeks after last radiation fraction
 EORTC's QLQ-BR23, specifically the breast symptoms: Last day of radiation therapy
 |  | 
| E.5.2 | Secondary end point(s) | 
| RTOG's acute radiation morbidity scoring criteria of the skin Image analysis of clinical photographs after radiation exposure
 EORTC's QLQ-BR23
 Useage of steroid cream throughout the trial
 |  | 
| E.5.2.1 | Timepoint(s) of evaluation of this end point | 
| Once weekly during the radiation treatment, and once weekly for 3 weeks following the last radiation fraction |  | 
| E.6 and E.7 Scope of the trial | 
| E.6 | Scope of the trial | 
| E.6.1 | Diagnosis | No | 
| E.6.2 | Prophylaxis | Yes | 
| E.6.3 | Therapy | No | 
| E.6.4 | Safety | No | 
| E.6.5 | Efficacy | No | 
| 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 | 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 | 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 | Yes | 
| E.8.2.3 | Other | No | 
| E.8.2.4 | Number of treatment arms in the trial | 4 | 
| 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 | 
| Last visit of last subject. |  | 
| 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 | 1 | 
| E.8.9.1 | In the Member State concerned days | 0 |