Our data showed that a high expression of TBC1D9 was positively correlated with CD24 expression in all BC tissue samples (rho = 0.20, p = 0.07) and in IDC (rho = 0.27, p = 0.02) and TNBC samples (rho = 0.36, p = 0.006) but not in non-TNBC samples including DCIS (rho = −0.09, p = 0.66) or without DCIS (rho = −0.09, p = 0.85) (Table 1). The gene discussed is CD24; the disease is ductal breast carcinoma in situ.