Glowing dye reveals hidden immune clues in esophageal cancer

This study tested a new imaging technique to visualize PD-L1, a protein that helps tumors hide from the immune system, in people with esophageal cancer. Researchers gave 21 participants a fluorescent dye that attaches to PD-L1 and used a special camera during endoscopy to see where and how much PD-L1 was present before and after standard treatment. The goal was to learn more about PD-L1 patterns, not to treat the cancer directly, so this was a knowledge-gathering study.