LINC-ROR and cancer: Apart from ANRIL, which is induced by hypoxia, previous reports have also characterized several other lncRNAs as hypoxia-responsive lncRNAs, such as lincRNA-p21 [8], LET [15], NEAT1 [22] and linc-ROR [23], which can be regulated by hypoxia and are involved in hypoxia-induced signaling transduction in cancer.