Targeted therapies and immunotherapy for stomach cancer
What are targeted therapies?
Targeted therapy uses drugs to find and attack cancer cells. There are many different types of targeted therapy drugs. Each type targets something in or around the cancer cell that is helping it grow and survive.
Targeted therapy drugs may be used to treat advanced stomach cancer.
Targeted therapy drugs for stomach cancer
Sometimes a targeted therapy drug called trastuzumab is given with chemotherapy to treat advanced stomach cancer. Targeted therapy drugs target something in or around the cancer cell that is helping it grow and survive.
Trastuzumab only works for people with a stomach cancer that has high levels of a protein called HER2. 10 to 15 out of every 100 people with stomach cancer (10 to 15%) have a HER2-positive cancer. Tests can be done on tissue taken at a biopsy or during surgery to find out if the cancer cells have high levels of HER2.
Trastuzumab attaches to the HER2 proteins on the surface of the cancer cells. This stops the cancer cells from dividing and growing.
How trastuzumab is given
Trastuzumab is given as a drip (infusion) every 3 weeks. If it works well, your cancer doctor may decide to keep giving it after your chemotherapy finishes. The side effects of trastuzumab are usually mild.
Related pages
What is immunotherapy?
Immunotherapy drugs use the immune system to find and attack cancer cells.
You may be offered an immunotherapy drug called nivolumab. Nivolumab targets and blocks a protein (receptor) called PD-1 on the surface of T cells, which are part of the immune system. It also blocks another protein called PD-L1. This helps the immune system to find and attack the cancer cells.
Some people have tests on the cancer cells to check the levels of PD-L1. The results can tell your doctor how likely this type of immunotherapy drug is to be helpful. Immunotherapy drugs can still work for you even if results do not show high levels of PD-L1.
You may be given nivolumab along with chemotherapy if you have advanced stomach cancer. Your cancer doctor can tell you more about whether nivolumab might be helpful in your situation.
Some people with advanced cancer of the stomach may be offered another immunotherapy drug called pembrolizumab with chemotherapy. This will depend on the treatments you’ve had before and the levels of PD-L1 that are found on the cancer cells. Your cancer doctor can tell you more about whether this might be suitable for you.
You have pembrolizumab, along with chemotherapy, as a drip (infusion) into a vein. A nurse will give them to you in the chemotherapy day unit.
About our information
This information has been written, revised and edited by Macmillan Cancer Support’s Cancer Information Development team. It has been reviewed by expert medical and health professionals and people living with cancer.
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References
Below is a sample of the sources used in our stomach cancer information. If you would like more information about the sources we use, please contact us at informationproductionteam@macmillan.org.uk
Lordick F, Carneiro S, Cascinu T, Fleitas K, Haustermans G, Piessen A, et al. Gastric cancer: ESMO Clinical Practice Guideline for diagnosis, treatment and follow-up. Annals of Oncology. 2022;33(10): 1005–1020. Available from www.doi.org/10.1016/j.annonc.2022.07.004 [accessed July 2023].
National Institute for Care and Health Excellence. Oesophago-gastric cancer: assessment and management in adults NICE guideline [NG83]. 2018. Available from www.nice.org.uk/guidance/ng83 [accessed July 2023].
Dr Chris Jones
Reviewer
Speciality Registrar in Clinical Oncologist and Clinical Lecturer in Clinical Oncology
Date reviewed
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