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Immunotherapy for Kaposi Sarcoma

Immunotherapy is the use of medicines to stimulate a person's own immune system to recognize and destroy cancer cells more effectively.

Immunomodulating agents

The way immunomodulating agents affect the immune system isn’t entirely clear. Three immunomodulating agents can be used to treat Kaposi sarcoma (KS). The first of these drugs to be developed, thalidomide, caused severe birth defects when taken during pregnancy. Because the other immunomodulating agents are related to thalidomide, there’s concern that they could also cause birth defects. That’s why all of these drugs can only be ordered through a special program run by the drug company that makes them.

Because all of these drugs can increase the risk of serious blood clots, they are often given along with aspirin or a blood thinner.

Thalidomide (Thalomid) was first used decades ago as a sedative and as a treatment for morning sickness in pregnant women. When it was found to cause birth defects, it was taken off the market. Later, it became available again as a treatment for multiple myeloma. A few studies show it works in some people with KS that has come back or keeps growing on other drugs.

Side effects of thalidomide can include drowsiness, fatigue, constipation, depression, and nerve damage (neuropathy). The neuropathy can be severe, and might not go away after the drug is stopped.

Pomalidomide (Pomalyst) can be used to treat people with KS who are HIV negative or have AIDS but their cancer is no longer responding to highly active antiretroviral therapy (HAART).

Some common side effects of pomalidomide include low blood counts (red cells, white cells, and platelets) kidney problems, rash, constipation, low phosphate or calcium levels, nausea and diarrhea.

Lenalidomide (Revlimid) might be used in some people with KS that has come back or keeps growing on other drugs.

The most common side effects of lenalidomide are thrombocytopenia (low platelets) and low white blood cell counts. It can also cause painful nerve damage.

More information about immunotherapy

To learn more about how drugs that work on the immune system are used to treat cancer, see Cancer Immunotherapy.

To learn about some of the side effects listed here and how to manage them, see Managing Cancer-related Side Effects.

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.

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U. S. Food and Drug Administration/Drug Approvals and Databases. (05/15/2020). FDA grants accelerated approval to pomalidomide for Kaposi sarcoma. Accessed 05/21/2020 from 

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Last Revised: May 21, 2020

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