DDN and cervical cancer: So far, lncRNA DDN-AS1, lncRNA TMPO-AS1, lncRNA RUSC1-AS1, and lncRNA DLEU1 have been detected to be upregulated in cervical cancer and acted as promoters in cervical carcinogenesis (Liu et al., 2018; Liu et al., 2019; Gang et al., 2020; Guo et al., 2020).