ADAMTS9 is a tumor inhibitor in assorted cancer cells: esophagus carcinoma (Lo et al., 2007), gastric cancer (Du et al., 2013), breast cancer (Ocak et al., 2013) and nasopharyngeal carcinoma (Lung et al., 2008; Sheu et al., 2009). This evidence concerns the gene ADAMTS9 and breast cancer.