Narrative review to capture patients' perceptions and opinions about non-response and response to biological therapy for severe asthma.

"Conflict of interest: All authors report that funding was received to support this work by the European Lung Foundation (ELF) from European Commission's Innovative Medicines Initiative 2 Joint Undertaking under grant agreement number 831434 (3TR). C. Coleman and C. Williams are employees of the ELF. There are no further disclosures."

"Conflict of interest: All authors report that funding was received to support this work by the European Lung Foundation (ELF) from European Commission's Innovative Medicines Initiative 2 Joint Undertaking under grant agreement number 831434 (3TR). C. Coleman and C. Williams are employees of the ELF. There are no further disclosures. Support statement: The 3TR project is funded by the Innovative Medicines Initiative (IMI) 2 Joint Undertaking (JU) under grant agreement number 831434. The JU receives support from the European Union's Horizon 2020 research and innovation programme and the European Federation of Pharmaceutical Industries and Associations (EFPIA). Disclaimer: Content of this publication reflects only the authors' view and the JU is not responsible for any use that may be made of the information it contains. The funder had no role in the design, conduct or write up of the narrative review or decision to publish. Further details about the 3TR project and IMI funding programme are available on their websites: www.3tr-imi.eu and www.imi.europa.eu. Funding information for this article has been deposited with the Crossref Funder Registry."