Immunohistochemistry staining showed that GTSE1 was mainly located in the cytoplasm of breast cancer cells (Fig. 2c), and its protein expression level was higher in TNBC (Fig. 2d), which was consistent with the result of the bc-GenExMiner database showing the GTSE1 mRNA level (Fig. 2e). This evidence concerns the gene GTSE1 and breast cancer.