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MiR-98 inhibits cell proliferation and invasion of non-small cell carcinoma lung cancer by targeting PAK1.

A family of small non-coding RNAs, ~22 nt in length, known as microRNAs (miRNAs), regulating ~30% of all human gene expression, have been reported to be involved in the pathogenesis of a number of types of cancers, including non-small cell carcinoma lung cancer (NSCLC). P21-activated protein kinase 1 (PAK1) is a clinical biomarker of Non-small carcinoma lung cancer. Here, we found that miR-98 is down-regulated, whereas PAK1 is highly expressed in NSCLC tissues and cells. We demonstrated that miR-98 directly targets the 3'UTR of PAK1 and down-regulates its expression at the mRNA and protein level. Also, miR-98 inhibited and PAK1 stimulated proliferation, migration, invasion and apoptosis of NSCLC cells. In agreement, PAK1 over-expression counteracted the inhibitory effect of miR-98. This current study suggests that exogenous miR-98 may serve as novel potential maker for NSCLC therapy.