According to the xiantao database, COL1A2, COL3A1, FGA, LUM, APOA1, APOH, and COL5A2 were more highly expressed in breast cancer than in normal tissues (Fig. 6C, p < 0.05), while the opposite pattern was seen for ALB and FBN1 (Fig. 6C, p < 0.05). Here, COL5A2 is linked to breast cancer.