HOTAIR and cancer: Out of the 87 studies, a total of 11 types of lncRNA have been independently reported in at least two articles to participate in cancer radioresistance/radiosensitivity, including lncRNA HOTAIR (n = 7), lncRNA GAS5 (n = 5), lncRNA PVT1 (n = 4), lncRNA TUG1 (n = 4), lncRNA NEAT1 (n = 3), lncRNA DGCR5 (n = 2), lncRNA FAM201A (n = 2), lncRNA KCNQ1OT1 (n = 2), lncRNA LINC00958 (n = 2), lncRNA MALAT1 (n = 2), and lncRNA XIST (n = 2).