It’s clear that radiation therapy, or radiotherapy, an approach used to treat cancer since the early 20th century, can be an effective companion to newer, immune-stimulating approaches known as immunotherapy. Research from a team from Roswell Park Comprehensive Cancer Center explains how radiation helps boost the immune system’s ability to fight cancer in combination with immune checkpoint inhibitors — and provides new evidence that the timing of these therapies can make a big difference in how effectively they work together.