Clustering analysis revealed that KLK10-14 genes consisted of one cluster in the 19 breast carcinoma (Supplementary Figure S1), and strongly positive associations was detected among these gene expressions (KLK10 and KLK11: p < 0.0001, KLK10 and KLK12: p = 0.002, KLK10 and KLK13: p = 0.0050, KLK10 and KLK14: p < 0.0001, KLK11 and KLK12: p < 0.0001, KLK11 and KLK13: p < 0.0001, KLK11 and KLK14: p < 0.0001, KLK12 and KLK13: p < 0.0001, KLK12 and KLK14: p < 0.0001, and KLK13 and KLK14: p = 0.0060). Here, KLK12 is linked to breast carcinoma.