Researchers develop personalized medicine tool for inherited colorectal cancer syndrome risk10 December 2018• PRESSRELEASE
An international team of researchers of the Leiden University Medical Center and the University of Utah has developed, calibrated, and validated a novel tool for identifying the genetic changes in Lynch syndrome genes that are likely to be responsible for causing symptoms of the disease. The results were published this week in the journal Genetics in Medicine.
Lynch syndrome is a hereditary condition that results in higher rates of colon, endometrial, and other cancers. If unmanaged, individuals with Lynch syndrome have a 75 percent lifetime risk of developing colorectal cancer. It is believed that approximately five percent of all colorectal cancer cases are associated with this syndrome.
Millions of distinct changes are possible in genes that control health, and it is a massive undertaking to identify which specific changes are associated with developing disease. Some genetic changes are believed to have no impact at all, while others carry significant risk. Researchers at Huntsman Cancer Institute work to understand and classify which gene changes are likeliest to cause disease, as well as to identify appropriate strategies to help manage disease risk.
The team used a laboratory test previously developed by the group of Niels de Wind, PhD, associate professor of human genetics at the Leiden University Medical Center in The Netherlands, to characterize genetic changes associated with disease risk. The lab test, called the Cell-free in vitro MMR Activity (CIMRA) assay, improves classification of variants of uncertain significance in Lynch syndrome. “The test is rapid and accurate,” said de Wind. In the current study, the test was thoroughly calibrated and validated, such that its results could now be integrated with computer-based modeling and clinical data. As a result, this study provides an analytical tool suitable for clinical use to assess the potential of changes in Lynch syndrome genes to cause disease.
“A key point is that we believe the accuracy of the tool combining the CIMRA test with the previously published computational analysis to be about 97 percent, making it appropriate for clinical use,” said Tavtigian. de Wind added that the work "represents a new pinnacle in the classification of genetic variation."
The authors believe that routine utilization of their methods will dramatically increase the rate of risk classification for genetic changes that previously were poorly understood. Moreover, this calibration strategy provides a template for the development, validation, and calibration of reliable strategies for the diagnostic assessment of other hereditary cancer predisposition syndromes and genetic disorders.
The article 'A Functional Assay-Based Procedure to Classify Mismatch Repair Gene Variants in Lynch Syndrome' can be found on the website of Genetics in Medicine.