@article {Bordas-Mart{\'\i}nez00897-2020, author = {Jaume Bordas-Mart{\'\i}nez and Ricard Gavald{\`a} and Jessica G. Shull and Vanesa Vicens-Zygmunt and Lurdes Planas-Cerezales and Guadalupe Bermudo-Peloche and Salud Santos and Neus Salord and Carmen Monasterio and Maria Molina-Molina and Guillermo Suarez-Cuartin}, title = {Idiopathic pulmonary fibrosis cluster analysis highlights diagnostic delay and cardiovascular comorbidity association with outcome}, volume = {7}, number = {2}, elocation-id = {00897-2020}, year = {2021}, doi = {10.1183/23120541.00897-2020}, publisher = {European Respiratory Society}, abstract = {Introduction Idiopathic pulmonary fibrosis (IPF) prognosis is heterogeneous despite antifibrotic treatment. Cluster analysis has proven to be a useful tool in identifying interstitial lung disease phenotypes, which has yet to be performed in IPF. The aim of this study is to identify phenotypes of IPF with different prognoses and requirements.Methods Observational retrospective study including 136 IPF patients receiving antifibrotic treatment between 2012 and 2018. Six patients were excluded due to follow-up in other centres. Cluster analysis of 30 variables was performed using approximate singular value-based tensor decomposition method and comparative statistical analysis.Results The cluster analysis identified three different groups of patients according to disease behaviour and clinical features, including mortality, lung transplant and progression-free survival time after 3-year follow-up. Cluster 1 (n=60) was significantly associated (p=0.02) with higher mortality. Diagnostic delay was the most relevant characteristic of this cluster, as 48\% of patients had >=2 years from first respiratory symptoms to antifibrotic treatment initiation. Cluster 2 (n=22) had the longest progression-free survival time and was correlated to subclinical patients evaluated in the context of incidental findings or familial screening. Cluster 3 (n=48) showed the highest percentage of disease progression without cluster 1 mortality, with metabolic syndrome and cardiovascular comorbidities as the main characteristics.Conclusion This cluster analysis of IPF patients suggests that diagnostic and treatment delay are the most significant factors associated with mortality, while IPF progression was more related to metabolic syndrome and cardiovascular comorbidities.Diagnostic delay and cardiovascular comorbidities impact IPF outcomes https://bit.ly/3lk2Z5y}, URL = {https://openres.ersjournals.com/content/7/2/00897-2020}, eprint = {https://openres.ersjournals.com/content/7/2/00897-2020.full.pdf}, journal = {ERJ Open Research} }