This study was conducted to evaluate the diagnostic and prognostic values of LINC00623 in patients with lung adenocarcinoma (LUAD), as well as the promoting role in LUAD progression. LINC00623 levels were identified by RT-qPCR. Using ROC curve analysis, the discrimination value of LINC00623 for LUAD from lung squamous cell carcinoma (LUSC) and the health was assessed. Recurrence-free and overall survival were estimated using the Kaplan-Meier method and multivariate survival analysis. Cell biological properties were analyzed by growth curves, transwell migration, and invasion assays. The downstream miRNA and genes were retrieved and annotated by online databases. LINC00623 was significantly upregulated in the LUAD tissues and cell lines compared to LUSC tissues and the noncancerous tissues. LINC00623 showed a discriminating power for predicting LUAD. LUAD patients with a high level of LINC00623 tend to have poor overall survival and recurrence-free survival. Downregulation of LINC00623 reduced the proliferation, migration, and invasion of LUAD cells. MiR-1207-5p was a target of LINC00623 and its target genes were related to PI3K/Akt signaling pathway. The subtypes, recurrence-free survival, and overall survival of patients with LUAD might be well discriminated by LINC00623 levels. LINC00623 promoted LUAD progression through sponging miR-1207-5p.
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