Twenty years ago, seven people diagnosed with metastatic HER2-positive breast cancer received a cancer vaccine as part of a clinical trial. Today, they’re all still alive. This prompted Zachary Hartman to study the immune systems of the people in the trial to see what was happening. He found that the women had immune cells that continue to recognize the cancer and keep it under control. Now his goal is to make that vaccine even more effective and make it work on other types of breast cancer.

Listen to the episode to hear Dr. Hartman explain: