PDCD4 and lung cancer: In lung cancer cells, lncRNA LINC‐PINT can act as a ceRNA to regulate the expression of PDCD4 by sponging miR‐208a‐3p.27 LncRNA EPB41L4A‐AS2 acts as an efficient sponge of miR‐301a‐5p, reversing the inhibitory effect of miR‐301a‐5p on FOXL1 expression.28 Fourthly, regulation of the protein activity.