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Exosome is a crucial manner for cancer cell to cell communication and circulating exosomes sever as promising diagnostic and prognostic markers for various types of diseases.A predominant type of cargo of exosome is small RNAs,especially miRNAs.Here,we profiled plasma exosomal miRNAs of six lung adenocarcinoma patients before and after surgery,as well as six healthy individuals as normal control.Our profiling revealed 38 upregulated and 37 downregulated exosomal miRNAs in the plasma of lung adenocarcinoma patients.Additionally,we found that most upregulated miRNAs were increased in the lung adenocarcinoma samples of TCGA database.We further evaluated the correlation between the upregulated exosomal miRNAs and overall survival with Kaplan-Meier survival analysis using online databases.Our resu ltS suggested that exosomal miR-151a-5p,miR-10b-5p,miR-192-5p,miR-106b-3p,and miR-484 are potential prognostic markers for lung adenocarcinoma.Importantly,we validated candidate miRNAs in lung adenocarcinoma patients before and after surgery as well as in healthy controls and found that miR-484 was significantly increased in the plasma of lung adenocarcinoma patients and strikingly decreased post-surgery.Hence,we provided novel information on lung adenocarcinoma-derived exosomal miRNA and potential non-invasive diagnostic and prognostic markers for lung adenocarcinoma.