Overview
Immunotherapy refers to treatments that change how the immune system works. In cancer care, it may help the body recognize and attack cancer cells more effectively. Common approaches include immune checkpoint inhibitors, CAR T-cell therapy, cytokines, cancer vaccines, and monoclonal antibodies used in certain ways. Some people receive immunotherapy alone, while others receive it with surgery, radiation, chemotherapy, or targeted therapy.
Who Is Affected
People with certain cancers are the main group who may be offered immunotherapy. Whether it is an option depends on the type of disease, stage, lab test results, overall health, past treatments, and access to specialized care. Some forms, such as CAR T-cell therapy, are offered only in specific centers with trained teams.
Diagnosis and Tests
Before starting immunotherapy, the care team usually confirms the diagnosis and checks whether the treatment is appropriate for that specific disease. This may involve imaging, blood tests, tissue biopsy, and tumor testing for markers that can help guide treatment decisions. During treatment, regular monitoring is often needed to look for side effects and to see how the disease is responding.
Treatment Categories
Immunotherapy is not one single treatment. Categories include checkpoint inhibitors that remove immune system “brakes,” CAR T-cell therapy that modifies a person’s immune cells, monoclonal antibodies that target specific molecules, immune-stimulating medicines, and some therapeutic vaccines. The way treatment is given and the possible side effects depend on the category and the condition being treated.
Living With It
People receiving immunotherapy often need regular follow-up visits and blood tests. Side effects may affect the skin, bowels, lungs, liver, hormone glands, nerves, or other organs, and some can appear during treatment or even after it ends. Keeping a symptom diary and reporting new problems early can help the healthcare team respond quickly.
When to Seek Medical Care
Contact your healthcare team promptly if you develop new or worsening symptoms during or after immunotherapy. Important symptoms to report include fever, rash, cough, shortness of breath, diarrhea, severe fatigue, yellowing of the skin or eyes, confusion, severe headache, chest pain, or a major change in urination. Do not assume symptoms are minor, because immune-related side effects can become serious if not addressed.
When It May Be an Emergency
Emergency care may be needed if immunotherapy causes a severe reaction or serious inflammation in vital organs. Seek urgent help for trouble breathing, swelling of the face or throat, severe chest pain, sudden weakness, seizures, severe dehydration, fainting, or confusion. If a person seems very unwell after a recent treatment, tell emergency staff that they are receiving or recently received immunotherapy.
Questions to Ask a Healthcare Professional
You may want to ask why immunotherapy is being recommended, what type is planned, how it will be given, and what side effects should be watched for. It can also help to ask how often monitoring will be needed, what symptoms should trigger an urgent call, and whether treatment might affect work, travel, fertility, vaccines, or other medicines. If cost or travel is a concern, ask about support services and where treatment will take place.