ERBB2 and breast cancer: We sought to re-examine SDC1 expression in distinct breast cancer subtypes in this study In pursuit of this objective, the GSE62931 dataset (n = 100) was integrated in GEO, and SDC1 expression was significantly up-regulated in TNBC samples (n = 54) compared to non-TNBC specimens (n = 47, inclusive of Luminal and HER2+ subtypes), as evidenced by the results (Fig. 2C).