Eligible patients were selected among those who had received at least one dose of neratinib in the context of the early access program conducted in Europe between 01 August 2017 and 31 December 2020 (the patient identification period) and residing in one of the five target following countries: Belgium, Croatia, France, Italy and Spain, which were part of the EAP. Patients were followed up until the end of the study observation period/study entry date (05 July 2022). As this study was retrospective, the decision to prescribe neratinib was taken prior to and independent of the proposal to select a patient for this study.
