ERBB2 and breast cancer: Figure 5 displayed the box plots for the expressions of KGs with each BC subtypes (normal, luminal, HER2-positive, and TNBC), where blue indicates the normal group and orange, green, and brown indicate luminal, HER2-positive, and triple-negative BC, respectively. We observed the significant differential expression patterns between the normal group and the subtypes of the BC group. Supplementary Figure S2 shows that the expression patterns of KGs with different BC progression stages significantly differentiated from the control group.