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Cytokines are small proteins that are crucial in controlling the growth and activity of other immune system cells and blood cells. When released, they signal the immune system to do its job. Cytokines affect the growth of all blood cells and other cells that help the body's immune and inflammation responses. They also help to boost anti-cancer activity by sending signals that can help make abnormal cells die and normal cells live longer.
One specific type of cytokine is called a chemokine. A chemokine can make immune cells move toward a target. There are different kinds of chemokines, including interleukins, interferons, tumor necrosis factors, and growth factors.
Some cytokines can be made in a lab and are used to treat cancer. Some are used to help prevent or manage chemotherapy side effects. They are injected, either under the skin, into a muscle, or into a vein. The most common ones are interleukins and interferons.
Interleukins are a group of cytokines that act as chemical signals between white blood cells. Interleukin-2 (IL-2) helps immune system cells grow and divide more quickly. A man-made version of IL-2 is approved to treat advanced kidney cancer and metastatic melanoma. IL-2 can be used as a single drug treatment for these cancers, or it can be combined with chemotherapy or with other cytokines such as interferon-alfa.
Side effects of IL-2 can include flu-like symptoms such as chills, fever, fatigue, and confusion. Some have nausea, vomiting, or diarrhea. Many people develop low blood pressure, which can be treated with other medicines. Rare but potentially serious side effects include an abnormal heartbeat, chest pain, and other heart problems. Because of these possible side effects, if IL-2 is given in high doses, it must be done in a hospital.
Other interleukins, such as IL-7, IL-12, and IL-21, continue to be studied for use against cancer too, both as adjuvants and as stand-alone agents.
Interferons are chemicals that help the body resist virus infections and cancers. The types of interferon (IFN) are named after the first 3 letters of the Greek alphabet:
Only IFN-alfa is used to treat cancer. It boosts the ability of certain immune cells to attack cancer cells. It may also slow the growth of cancer cells directly, as well as the blood vessels that tumors need to grow.
IFN-alfa can be used to treat these cancers:
Side effects of interferons can include:
These side effects can be severe and can make treatment with interferon hard for many people to tolerate. Most side effects don’t last long after the treatment stops, but fatigue can last longer. Other rare long-term effects include damage to nerves, including those in the brain and spinal cord.
The American Cancer Society medical and editorial content team
Our team is made up of doctors and oncology certified nurses with deep knowledge of cancer care as well as journalists, editors, and translators with extensive experience in medical writing.
American Society of Clinical Oncology (ASCO). ASCO Annual Meeting 2019: Immunotherapy for lung cancer, gastrointestinal cancers and targeted therapy for breast cancer. Accessed at https://www.cancer.net/blog/2019-06/asco-annual-meeting-2019-immunotherapy-lung-cancer-gastrointestinal-cancers-and-targeted-therapy on December 19, 2019.
American Society of Clinical Oncology (ASCO). Understanding immunotherapy. Accessed at https://www.cancer.net/navigating-cancer-care/how-cancer-treated/immunotherapy-and-vaccines/understanding-immunotherapy on December 19, 2019.
Bayer VR, Davis ME, Gordan RA, et al. Immunotherapy. In Olsen MM, LeFebvre KB, Brassil KJ, eds. Chemotherapy and Immunotherapy Guidelines and Recommendations for Practice. Pittsburgh, PA: Oncology Nursing Society; 2019:149-189.
Brodsky AN. Cancer immunotherapy: The year in review and a look at the year ahead. Cancer Research Institute. Accessed at https://www.cancerresearch.org/blog/january-2019/cancer-immunotherapy-2018-review-2019-predict on December 19, 2019.
Hafeez U, Gan HK, Scott AM. Monoclonal antibodies as immunomodulatory therapy against cancer and autoimmune diseases. Curr Opin Pharmacol. 2018; 41:114-121.
Wraith DC. The future of immunotherapy: A 20-year perspective. Front Immunol. 2017:8:1668. Accessed at https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5712390/ on December 19, 2019.
Last Revised: December 27, 2019
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