fluorescence in situ hybridization [also called FISH]

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(flur-ESS-ince in SY-too hy-brid-ih-ZAY-shun)

This is a lab test that measures the amount of a certain gene in cells. It can be used to see if an invasive cancer has too many HER2 genes. A cancer with too many of these genes is called HER2-positive. If a cancer is HER2-positive, it may respond to Herceptin (chemical name: trastuzumab). This is a drug that can slow down or stop the growth of cancer with too many HER2 genes.

Read more about fluorescence in situ hybridization (FISH) test.

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