NCI Dictionary of Cancer Terms

The NCI Dictionary of Cancer Terms features 8,351 terms related to cancer and medicine.

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human epidermal growth factor receptor 2 test
(HYOO-mun eh-pih-DER-mul grothe FAK-ter reh-SEP-ter 2 …)
A laboratory test that measures the amount of HER2 protein on cancer cells or how many copies of the HER2 gene are in the DNA. The HER2 protein is involved in normal cell growth. It may be made in larger than normal amounts by some types of cancer, including breast, ovarian, bladder, pancreatic, and stomach cancer. This may cause cancer cells to grow more quickly and spread to other parts of the body. A human epidermal growth factor receptor 2 test may be done to help plan treatment. It is a type of tumor marker test. Also called HER2 test and HER2/neu test.