Figure 1A shows that OPG is highly expressed in the triple-negative breast cancer (TNBC) cell lines (BT-20, MDA-MB-231, MDA-MB-468, and SUM149PT), relative to the other breast cancer cell lines (SKBR-3, MCF-7 and T-47D) and the non-carcinogenic breast epithelial cells (MCF-12A and MCF-10A). This evidence concerns the gene TNFRSF11B and triple-negative breast carcinoma.