ERBB2 and breast neoplasm: SFRP1 expression was also higher in triple-negative compared to luminal (log2 FC = 3.14; p-value < 0.001) and HER2 (log2 FC = 2.99; p-value < 0.001) breast tumors and in basal compared to luminal (log2 FC = 2.96; p-value < 0.001) and HER2 (log2 FC = 2.82; p-value < 0.001) breast tumors (Figure 1B).