This is a non-interventional study based on new data collection to gather real-world information (i.e., data under routine medical practice) on safety and effectiveness of the Ofev® Capsules treatment.

The study will consist of a baseline visit and follow-up visits at Week 4, 13, 26, 39, 52, 65, 78, 91 and 104 for patients who have newly initiated Ofev® Capsules. The patients will be followed up until discontinuation of Ofev® Capsules treatment.

As this is an observational study, no specific treatment is mandated or withheld from the patients. The choice of maintenance treatment for IPF must be according to regular medical practice and at the discretion of the physician (i.e., no randomised assignment of patient to treatment is performed).

All patients administrated Ofev® Capsules after the launch at the sites contracted with the sponsor will be registered. The Case Report Forms (CRFs) of 1000 patients will be collected. However the patient registration continues until the approval condition has been removed.

Patients participating in the subsequent follow-up will undergo regular observations. These observations should be reported after approximately Week 4, 13, 26, 39, 52, 65, 78, 91 and 104 since the initiation of Ofev® Capsules as long as they continue to receive the treatment. Patients will not be followed any longer once they are reported to have discontinued the Ofev® Capsules treatment.

Inclusion criteria:

Essentially, patients are diagnosed with IPF based upon the most recent the American Thoracic Society (ATS), the European Respiratory Society (ERS), the Japanese Respiratory Society (JRS), and the Latin American Thoracic Association (ALAT) guideline.

1000 Japanese patients with IPF

After the study is completed and the primary manuscript is accepted for publishing, researchers can use this following link https://www.mystudywindow.com/msw/datasharing to request access to the clinical study documents regarding this study, and upon a signed "Document Sharing Agreement".

Also, Researchers can use the following link https://www.mystudywindow.com/msw/datasharing to find information in order to request access to the clinical study data, for this and other listed studies, after the submission of a research proposal and according to the terms outlined in the website.

The data shared are the raw clinical study data sets.

After all regulatory activities are completed in the US and EU for the product and indication, and after the primary manuscript has been accepted for publication.

For study documents - upon signing of a 'Document Sharing Agreement'. For study data - 1. after the submission and approval of the research proposal (checks will be performed by both the independent review panel and the sponsor, including checking that the planned analysis does not compete with sponsor's publication plan); 2. and upon signing of a 'Data Sharing Agreement'.

Safety set: This patient set included all patients who didn't have any predefined important protocol deviations (IPDs) leading to exclusion from this analysis set.

Up to week 104

Safety set: This patient set included all patients who didn't have any predefined important protocol deviations (IPDs) leading to exclusion from this analysis set.