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QIAGEN Introduces CE-marked Molecular Assay for the Cancer Biomarker K-ras

Published: Tuesday, November 11, 2008
Last Updated: Tuesday, November 11, 2008
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Pyrosequencing-based molecular test can detect and profile genetic mutations to predict responses to EGFR inhibitor therapies in colorectal cancer patients.

QIAGEN N.V. has announced the launch of a new test to determine mutations of the K-ras gene. The K-ras gene is mutated in between 35 percent and 45 percent of metastatic colorectal cancer (CRC) patients.

Studies have shown that K-ras testing can better define which CRC patients will benefit from treatment with epidermal growth factor receptor (EGFR) inhibiting monoclonal antibodies, such as Amgen’s Vectibix® (panitumumab) and Imclone/Bristol-Myers Squibb’s Erbitux® (cetuximab).

QIAGEN’s new “PyroMark Q24 K-ras Assay-Kit” is CE-marked for use in second-line treatment of metastatic CRC together with Erbitux or Vectibix and will be available near the beginning of 2009. QIAGEN intends to launch this assay for in vitro diagnostic use in the United States as well.

QIAGEN’s new “PyroMark Q24 K-ras Assay-Kit” is able to detect all major and minor known mutations in the K-ras codons 12, 13 and 61, and, in addition, allows the discovery of new mutations as well. This assay is the first molecular assay QIAGEN is launching based on Pyrosequencing, a fundamental technology for short-length, high resolution sequence analysis and quantification. QIAGEN acquired the technology and the associated business in October 2008 from Biotage.

The market for K-ras testing has seen strong momentum over the last months. A number of recently published studies, including a large multinational prospective study conducted by the Belgian University in Leuven, suggested that the K-ras mutation status is a prognostic biomarker predicting the outcome of EGFR therapies.

In this study, approximately 40% of all CRC-patients had mutated K-ras genes. The trial data indicated that such patients will not benefit from, and in some cases even experience negative reactions to EGFR antibodies, while patients without specific mutations are likely to benefit from this drug treatment.

In response to these studies, European regulators adopted the indication for Vectibix (panitumumab) to include only patients whose tumors carry the unmutated K-ras gene.

Earlier this month, the U.S. National Comprehensive Cancer Network (NCCN) issued new guidelines for treatment of CRC which recommended that only patients with tumors characterized by the unmutated K-ras gene shall be treated with EGFR drugs. This organization of 21 cancer centres furthermore recommended that oncologists should generally determine the K-ras gene status of all patients diagnosed with CRC prior to any treatment.


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