| E.1 Medical condition or disease under investigation | 
| E.1.1 | Medical condition(s) being investigated | 
| Idiopathic Pulmonary Fibrosis |  | 
| E.1.1.1 | Medical condition in easily understood language | 
| Idiopathic Pulmonary Fibrosis |  | 
| E.1.1.2 | Therapeutic area | Diseases [C] - Respiratory Tract Diseases [C08] | 
| MedDRA Classification | 
| E.1.2 Medical condition or disease under investigation | 
| 
| E.1.2 | Version | 21.1 |  
| E.1.2 | Level | PT |  
| E.1.2 | Classification code | 10021240 |  
| E.1.2 | Term | Idiopathic pulmonary fibrosis |  
| E.1.2 | System Organ Class | 10038738 - Respiratory, thoracic and mediastinal 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 investigate the efficacy of BI 1015550 compared to placebo based on the change from baseline in Forced Vital Capacity (FVC).
 - To investigate safety and tolerability of BI 1015550 in the overall trial population.
 |  | 
| E.2.2 | Secondary objectives of the trial |  | 
| E.2.3 | Trial contains a sub-study | Yes | 
| E.2.3.1 | Full title, date and version of each sub-study and their related objectives | 
| 24 hr Cough measurement (substudy at dedicated sites only) 24 hr record of patient's daily sound will be collected via a device
 installed on the patient
 |  | 
| E.3 | Principal inclusion criteria | 
| - Patients aged ≥40 years when signing the informed consent. - Diagnosis:
 -- a. IPF based on 2018 ATS/ERS/JRS/ALAT Guideline [R18-2794] as confirmed by the investigator based on chest HRCT scan taken within 12 months of Visit 1 and if available surgical lung biopsy. and
 -- b. UIP or probable UIP HRCT pattern consistent with the clinical diagnosis of IPF
 - Stable for at least 8 weeks prior to Visit 1. Patients have to be either :
 -- not on therapy with nintedanib or pirfenidone for at least 8 weeks prior to Visit 1 (combination of nintedanib plus pirfenidone not allowed), or
 -- on stable* therapy with nintedanib or pirfenidone for at least 8 weeks prior to Visit 1 and planning to stay stable on this background therapy after randomisation.
 - Forced Vital Capacity (FVC) ≥45% of predicted normal at Visit 1
 - DLCO (corrected for haemoglobin [Hb] [Visit 1]) ≥ 25% to < 80% of predicted normal at Visit 1.
 - Signed and dated written informed consent in accordance with ICH-GCP and local legislation prior to admission to the trial.
 |  | 
| E.4 | Principal exclusion criteria | 
| - Relevant airways obstruction (pre-bronchodilator FEV1/FVC < 0.7) at Visit 1. - In the opinion of the Investigator, other clinically significant pulmonary abnormalities.
 - Acute IPF exacerbation within 4 months prior to screening and/or during the screening period (investigator-determined).
 - Lower respiratory tract infection requiring antibiotics within 4 weeks prior to Visit 1 and/or during the screening period.
 - Major surgery (major according to the investigator’s assessment) performed within 3 months prior to Visit 1 or planned during the course of the trial. (Being on a transplant list is allowed).
 - Any documented active or suspected malignancy or history of malignancy within 5 years prior to Visit 1, except appropriately treated basal cell carcinoma of the skin, “under surveillance” prostate cancer or in situ carcinoma of uterine cervix.
 - Evidence of active infection (chronic or acute) based on clinical exam or laboratory findings (see table 5.2.3 :1) at Visit 1 or at Visit 2.
 - Any suicidal behaviour in the past 2 years (i.e. actual attempt, interrupted attempt, aborted attempt, or preparatory acts or behavior).
 - Confirmed infection with SARS-CoV-2 within 4 weeks prior to visit 1 or
 during screening period.
 - Further criteria apply.
 |  | 
| E.5 End points | 
| E.5.1 | Primary end point(s) | 
| 1) The primary endpoint is the change from baseline in FVC |  | 
| E.5.1.1 | Timepoint(s) of evaluation of this end point |  | 
| E.5.2 | Secondary end point(s) | 
| 1) The percentage N (%) of patients with Treatment Emergent Adverse Events (TEAE). |  | 
| 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 | 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 | 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 | 8 | 
| E.8.5 | The trial involves multiple Member States | Yes | 
| E.8.5.1 | Number of sites anticipated in the EEA | 63 | 
| 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 | 
| Australia |  
| Canada |  
| Chile |  
| China |  
| Japan |  
| Korea, Republic of |  
| Mexico |  
| Russian Federation |  
| Ukraine |  
| United States |  
| Austria |  
| Denmark |  
| Finland |  
| Germany |  
| Hungary |  
| Italy |  
| Netherlands |  
| Poland |  
| Slovakia |  
| Spain |  
| United Kingdom |  
| Czechia |  
| Argentina |  
| Greece |  | 
| 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 |  | 
| 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 | 2 | 
| 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 | 2 |