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FDA Approves New Test To Help Determine if Breast Cancer Patients Are Candidates for Herceptin Treatment

June 14, 2011 By Bio-Medicine.Org

SILVER SPRING, Md., June 14, 2011 /PRNewswire-USNewswire/ — The
U.S. Food and Drug Administration today approved a new genetic test
that will help health care professionals determine if women with
breast cancer are HER2-positive and, therefore, candidates for
Herceptin (trastuzumab), a commonly used breast cancer
treatment.

(Logo: http://photos.prnewswire.com/prnh/20090824/FDALOGO)

The test, called Inform Dual ISH, allows for measurement of the
number of copies of the HER2 gene in tumor tissue. The HER2 gene is
located on chromosome 17 in human cells. An excessive amount of the
protein produced by the gene is found in some types of cancer
cells, including breast cancer cells.

The Inform Dual ISH test allows lab personnel to count the
number of copies of HER2 genes on chromosome 17 in a small sample
of the breast tumor. The sample is stained with chemicals that
cause copies of HER2 genes and chromosome 17 to change color.
Copies of the HER2 gene appear black and copies of chromosome 17
appear red. These color changes can be seen under a standard
microscope.

This feature allows lab personnel to see and count copies of
chromosome 17 and HER2 genes on the same slide, similar to HER2
amplification measurements that have traditionally only been
available using fluorescence microscopes. The Inform Dual ISH,
however, allows lab staff to see the HER2 and chromosome 17 signals
directly under a microscope, for longer periods of time.

“When used with other clinical information and laboratory tests,
this test can provide health care professionals with additional
insight on treatment decisions for patients with breast cancer,”
said Alberto Gutierrez, Ph.D., director of the Office of In Vitro
Diagnostic Device Evaluation and Safety in the FDA’s Center for
Devices and Radiological Health.

The FDA based its approval of the Inform Dual ISH on a U.S.
study involving tumor

‘/>”/>

SOURCE

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