(A,B) qRT- PCR analysis was performed to detect the LINC00668 expression level in HCC tissues the adjacent non-tumor tissues and different stages of HCC. (C) The expression of LINC00668 in normal liver cell line THLE-3 and HCC cell lines (HepG2, SNU-387, MHCC-97H, Huh7) was examined by qRT-PCR analysis. (D) The efficiency of LINC00668 knockdown was verified by qRT-PCR analysis. (E) Cell colony formation assay was conducted to detect cell proliferation ability after knockdown of LINC00668. (F,G) Transwell assays were performed to examine cell migration and invasion after knockdown of LINC00668. (H) EMT process changing was detected by Western blot assay after down-regulated LINC00668. *P<0.05, **P<0.01. Abbreviation: EMT, epithelial–mesenchymal transition.