
Lung cancer (LC) incidence is increasing globally, and altered levels of microRNAs (miRNAs) in the blood may contribute to identifying individuals with LC. The study identified miRNAs differentially expressed in peripheral blood at LC diagnosis and evaluated, in pre‐diagnostic blood specimens, how long before diagnosis expression changes of such candidate miRNAs could be detected. Higher expression of three candidates, miR‐320b, 320c, and 320d, was associated with poor survival, independent of LC stage and subtype. Moreover, miR‐320c and miR‐320d expression were higher in pre‐diagnostic specimens collected within two years of LC diagnosis. The results indicated that elevated miR‐320c and miR‐320d might be early indications of imminent and advanced LC.
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