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Fluorescence in situ hybridization (FISH) is a test that \"maps\" the genetic material in human cells, including specific genes or portions of genes.
Because a FISH test can detect genetic abnormalities associated with cancer, it's useful for diagnosing some types of the disease. When the type of cancer has previously been diagnosed, a FISH test also may provide additional information to help predict a patient's outcome and whether he or she is likely to respond to chemotherapy drugs.
In breast cancer patients, for example, a FISH test on breast cancer tissue removed during a biopsy can show whether the cells have extra copies of the HER2 gene. Cells with extra copies of the gene have more HER2 receptors, which receive signals that stimulate the growth of breast cancer cells. So patients with extra copies of the gene are more li...
Because FISH testing is expensive and not widely available, it's not as commonly used as another breast cancer test: ImmunoHistoChemistry (IHC).
During a FISH test using a sample of the patient's tissue, special colored dyes are attached to specific parts of certain chromosomes in order to visualize and count them under a fluorescent microscope and to detect cancer-promoting abnormalities.
Compared to standard cytogenetic (cell gene) tests, one advantage of FISH is that it can identify genetic changes that are too small to be seen under a microscope. Another advantage is that FISH doesn't have to be performed on cells that are actively dividing. Because other tests cannot be performed until cancer cells have been growing in lab dishe...
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