As shown in Fig. 1A and Table 4, TGF‐β was positively expressed in 59.7% of breast cancer tissues (40/67), EGFR expression was upregulated in 37.3% of breast cancer tissues (25/67), and EGFR and TGF‐β were co‐expressed in 29.9% of breast cancer tissues (20/67). Here, EGFR is linked to breast cancer.