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The objectives of the present study were to determine the clinical phenotypes of the Chinese C-BIOPRED cohort and their link to the sputum proteome.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Methods<\/jats:title>\n                    <jats:p>Partition-around-medoids clustering was applied to a training set of 362 nonsmoking, smoking or ex-smoking severe asthma patients, and nonsmoking mild\u2013moderate asthma patients using eight clinicophysiological variables, with validation performed in the remaining 181.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Results<\/jats:title>\n                    <jats:p>Three stable clusters were defined, with Cluster T1 composed of predominantly female patients with severe nonsmoking asthma experiencing frequent exacerbations with moderate airflow obstruction, and Cluster T3 of elderly male patients with smoking\/ex-smoking late-onset severe asthma and severe airflow obstruction and a moderate number of exacerbations. Cluster T2 was composed of nonsmokers with a mild\u2013moderate airflow obstruction and no previous exacerbations. Validation clusters (V1, V2 and V3) were similar to the training set clusters. Differentially expressed proteins in sputum supernatants measured by liquid chromatography with tandem mass spectrometry pointed to differences in the complement and coagulation cascade pathway between Cluster 1 (T1 and V1) and Cluster 3 (T3 and V3), as well as between Cluster 2 (T2 and V2) and Cluster 3.\u00a0Galectin 10 was upregulated in Cluster 1 compared with Cluster 2, and correlated with exacerbations, fractional exhaled nitric oxide, blood and sputum eosinophil count and oral corticosteroid dose in Cluster 1.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Conclusion<\/jats:title>\n                    <jats:p>The clinical clusters were differentiated by smoking status, degree of airflow obstruction and exacerbation history, and by sputum complement and coagulation pathways, and galectin 10 levels.<\/jats:p>\n                  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