More interestingly, LINC00665 can encode a special micropeptide (CIP2A-BP) to inhibit the progression of three negative breast cancers or act as a ceRNA that is involved in regulating the LINC00665/AGTR1/miR-34a-5p axis and other biological behaviours in glioma (Guo et al., 2020; Ruan et al., 2020; Dai et al., 2021). This evidence concerns the gene CIP2A and breast cancer.