Cancer treatment routinely involves taking out lymph nodes near the tumor in case they contain metastatic cancer cells. But new findings from a clinical trial show that immunotherapy can activate tumor-fighting T cells in nearby lymph nodes. "Immunotherapy is designed to jump start the immune response, but when we take out nearby lymph nodes before treatment, we're essentially removing the key locations where T cells live and can be activated," Spitzer said. Rather than the immunotherapy pumping up the T cells in the tumor, he said, T cells in the lymph nodes are likely the source for T cells circulating...