A new study reveals the mechanism by which aggressive triple-negative breast cancer (TNBC) evades the body’s immune defenses. Researchers discovered that TNBC tumors produce high levels of a protein called TSPAN6, which activates a specific signaling pathway within tumor cells. This pathway, in turn, causes the tumor cells to release a chemical signal that deactivates nearby cancer-fighting T-cells, effectively switching off the local immune response. This immunosuppressive environment allows the cancer to grow unchecked. The findings, based on both mouse models and human tissue analysis, identify TSPAN6 as a potential new target for therapies aimed at re-arming the immune system against this hard-to-treat cancer. For the full details, read the complete article at https://www.sciencedaily.com/releases/2026/04/260411022031.htm.