ADAM9 and cancer: To better understand the role of ADAM9 in TNBC progression, we investigated ADAM9 expression in clinical samples, analyzed the correlation between ADAM9 expression and survival of patients with TNBC, and examined the cancer cell motility and invasiveness by knocking down the expression of ADAM9 in human TNBC cell lines, MDA-MB-231 and Hs578t, using small interference RNA (siRNA).