In the past decade, immunotherapy has helped save the lives of many cancer patients, many with lung cancer, who might have otherwise faced almost certain death sentences. However, only about 20% of patients who received immune therapies -- designed to enhance or override natural limitations on immune system response -- saw sustained benefits from treatment. Now Yale scientists have helped identify crucial ways that immune system cells congregate and communicate with each other to identify and eradicate tumors, an insight that can help improve these outcomes.