CASP8 and intervertebral disk degenerative disorder: The fold-changes of the normalized intensities were 5.99, 3.21, 2.82, 0.168, 2.42 and 2.17, respectively, for the four lncRNAs (lincRNA-SLC20A1-1, RP11-296A18.3, KB-1683C8.1 and lincRNA-BTG2) and two mRNAs (CASP8 and FAF1) in the gene chip analysis between the IDD and the normal group.