If someone asked you to explain immunotherapy to a friend, what would you say? Most of my patients hear "immunotherapy" and assume it's another version of chemotherapy. It's not. And that difference matters. Here's how I explain it: Chemotherapy uses drugs that directly attack cancer cells - but it also damages healthy cells, which is why it causes the side effects most people fear. Immunotherapy takes a different approach. It helps your own immune system recognize and fight the cancer. Cancer cells are clever - they find ways to hide from your immune system or shut it down. Immunotherapy removes those hiding spots. Think of it like this: your immune system is a security guard. The cancer has found a way to wear a disguise. Immunotherapy pulls off the disguise so the guard can do its job. This means immunotherapy often works differently than chemo - it can take longer to show results, but when it works, the response can last much longer. I've just added a full lesson to the Classroom that goes deeper into the different types of immunotherapy (checkpoint inhibitors, CAR-T, monoclonal antibodies, and more). If you want a clearer picture of what immunotherapy actually is and how it works, that's a good place to start.