MALAT1 and cancer: Controversial reports exist between in vitro and in vivo studies regarding Malat1’s function in nuclear speckles and cancers (Nakagawa et al., 2012; Zhang et al., 2012; Eißmann et al., 2012; Tripathi et al., 2010; Ip and Nakagawa, 2012; Kim et al., 2018; Cui et al., 2019; Yang et al., 2019; Yi et al., 2019).