Health Topic

Cancer Immunotherapy

Immunotherapy is a cancer treatment that helps your immune system fight cancer. Learn about the different types.

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Important: This page is general information, not medical advice. It does not recommend or prescribe any treatment. Always consult your doctor or pharmacist before starting, stopping or changing any medicine.

About Cancer Immunotherapy

Immunotherapy is a cancer treatment that helps your immune system fight cancer. It is a type of biological therapy. Biological therapy uses substances made from living organisms or versions of these substances made in a lab. Immunotherapy isn't used for all cancers, and the response to treatment varies. If you're getting immunotherapy, your health care provider will monitor your treatment closely.

Immunotherapy isn't used as often as other cancer treatments, such as surgery, chemotherapy, and radiation therapy. But immunotherapy is used for some types of cancer, and researchers are doing clinical trials to see whether it also works for other types.

Cancer begins in your cells, which are the building blocks of your body. Usually, your body forms new cells as needed, replacing old cells that die. Sometimes, this process goes wrong. When you have cancer, some of your cells begin to multiply without stopping, and old cells don't die when they should. They spread into the surrounding tissues.

One reason cancer cells can keep growing and spreading is that they can hide from your immune system. Some immunotherapies can "mark" your cancer cells. This makes it easier for your immune system to find and destroy the cells. It is a type of targeted therapy that uses medicines or other substances that attack specific cancer cells with less harm to normal cells. Other types of immunotherapies work by boosting your immune system to work better against cancer.

There are different forms of immunotherapy, so how they are given varies. You could get immunotherapy intravenously (by IV), in pills or capsules, or cream for your skin. For bladder cancer, they might place it directly into your bladder.

How often and how long you get immunotherapy also varies. It depends on your type of cancer, how advanced it is, the type of immunotherapy you get, and how well it is working. You may have treatment every day, week, or month. Some immunotherapies are given in cycles, so your body has time to rest and recover.

You may have side effects. The most common side effects are skin reactions at the needle site if you get it by IV. Other side effects may include flu-like symptoms or, rarely, severe reactions.

It sits within Cancers.

The lead U.S. institute for this subject is the National Cancer Institute.

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Research on Cancer Immunotherapy

4,429 studies areregistered for this condition on ClinicalTrials.gov, the U.S. National Library of Medicine's public registry. A selection is below — the links go straight to the registry entry, not to a summary of ours.

What a registered study does and does not mean. Registration means a study exists and has been declared publicly. It says nothing about whether the treatment being tested works, is safe, or is available to you. Many studies find no benefit — that is what research is for. Never seek out an experimental treatment on the strength of a registry entry alone.

Research currently under way

Research already completed

Study data from ClinicalTrials.gov, a service of the U.S. National Library of Medicine. Retrieved 2026-07-30. Registry entries are supplied by study sponsors and investigators; ClinicalTrials.gov does not verify their scientific validity. PocketsInfo is not affiliated with, and not endorsed by, the NLM or the NIH.

Where to read more

Rather than paraphrase, we point you to the primary sources. Every link below is to a government health agency, a national institute or a recognised medical body — grouped by what you are trying to find out.

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Clinical Trials

Medical subject headings

Clinicians and researchers index this subject under Neoplasms, Immunotherapy. These are the terms to use when searching medical literature.

This page is built from the MedlinePlus health topic record for Cancer Immunotherapy, a service of the U.S. National Library of Medicine (NLM), National Institutes of Health. Information is from MedlinePlus.gov. PocketsInfo is not affiliated with, and is not endorsed by, the NLM or the NIH. Retrieved 30 July 2026.