Immunotherapy for ovarian cancer

Last medical review:

Immunotherapy helps to strengthen or restore the immune system's ability to fight cancer. This works to kill cancer cells and stop cancer cells from growing and spreading.

Immunotherapy is sometimes used to treat ovarian cancer. If you have immunotherapy, your healthcare team will use what they know about the cancer and about your health to plan the drugs, doses and schedules.

Immunotherapy may be the only treatment you have or it may be used along with other treatments. You may have immunotherapy to treat ovarian cancer that:

  • can't be removed with surgery and is microsatellite instability-high (MSI-H) or mismatch repair deficient (dMMR)

Immune checkpoint inhibitors

The type of immunotherapy drugs used for ovarian cancer are called immune checkpoint inhibitors.

The immune system normally stops itself from attacking normal cells in the body by using specific proteins called checkpoints. Checkpoints slow down or stop an immune system response. Small intestine adenocarcinoma cells can sometimes use these checkpoints to hide and avoid being attacked by the immune system. Immune checkpoint inhibitors work by blocking the checkpoint proteins so immune system cells (called T cells) attack and kill the cancer cells.

Immune checkpoint inhibitors may be offered if the cancer has certain genetic changes known as high microsatellite instability (MSI-H) or mismatch repair deficiency (dMMR).

If th cancer has these features, the following immune checkpoint inhibitors may be used:

  • pembrolizumab (Keytruda)
  • dostarlimab (Jemperli)

Immunotherapy drugs for ovarian cancer may not be covered by all provincial or territorial drug plans. Your doctor or healthcare team will discuss access to these drugs with you and if you may benefit from this treatment.

Side effects of immunotherapy

Side effects of immunotherapy will depend mainly on the type of drug or drug combination, the dose, how it's given and your overall health. Tell your healthcare team if you have side effects that you think might be from immunotherapy. The sooner you tell them of any problems, the sooner they can suggest ways to help you deal with them.

Common possible side effects of immunotherapy for ovarian cancer include:

Immunotherapy drugs can have serious and potentially life-threatening side effects because they can make your immune system work against your organs. Talk to your healthcare team to learn more about the side effects of this treatment.

Find out more about immunotherapy

Find out more about immunotherapy. To make the decisions that are right for you, ask your healthcare team questions about immunotherapy.

Details on specific drugs change regularly. Find out more about sources of drug information and where to get details on specific drugs.

Expert review and references

  • Tien Le , MD, FRCSC, DABOG
  • American Society of Clinical Oncology (ASCO). Ovarian, Fallopian Tube, and Peritoneal Cancer Types of Treatment. 2022:
  • American Cancer Society. Immunotherapy for Ovarian Cancer. 2020:

Medical disclaimer

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