HOTAIR and cancer: Calle et al. recently discussed a lncRNA code in cancer, and managed to classify these lncRNAs into two categories: tumor-suppression-associated lncRNAs (e.g., LED, Linc-p21, GUARDIN, PTENP1) and tumor-promotion-associated lncRNAs (e.g., MALAT1, HOTAIR, NORAD, PVT1).