MSN and cancer: Consistent with the human breast cancer cohorts, MSN mRNA and protein expression was significantly elevated in TNBC cell lines compared to non-TNBC breast cancer cell lines in the comparative analysis with the Cancer Cell Line Encyclopedia (CCLE) dataset (Fig. 1D, p < 0.001), and our breast cancer cell line library (Fig. 1E, p < 0.001; mRNA and p = 0.002; protein, respectively).