NORAD and pachyonychia congenita: As we all know, lncRNAs can act as the microRNA decoys to sequester miRNAs, thus favoring expression of repressed target mRNAs, or lncRNAs can suppress the expression of target mRNAs by competitively binding to miRNAs [32]. Several studies had proved that NORAD serving as a ceRNAs could bind to miRNA, thus being involved in cellular processes in cancers, including PC [13, 18, 19].