Besides, previous studies showed that three lncRNAs, including NEAT1, MALAT1, and XIST (Hu et al., 2017; Guo et al., 2018; Jiao et al., 2018; Liu et al., 2019; Shan et al., 2020), and two circRNAs, including PKD2 and VIM (Fang et al., 2013; Li et al., 2018), were upregulated in BC. This evidence concerns the gene PKD2 and breast cancer.