Triple-negative breast tumors may hijack immune cells to attract nerves that help the cancer grow. Nerves growing through a tumor may help an aggressive breast cancer survive, expand, and resist treatment. Research published in Cell Death & Differentiation traces this process in triple-negative breast cancer, a particularly difficult form of the disease to treat. Immune cells draw nerves into tumorsThe investigation focused on macrophages, immune cells that normally fight infections and repair damaged tissue. Inside breast tumors, however, the same signal appears to attract nearby nerves that help the cancer grow and withstand treatment.