Implementing population-based screening for Lynch syndrome.
2017
6600 Background: A myriad of molecular markers has been proposed and tested with the promise of improving cancer care. Few have been validated and even fewer have been implemented in daily clinic. The most common hereditary colorectal cancer entity, Lynch Syndrome, can be identified in a subset of colorectal cancer patients by screening molecular markers for mismatch-repair (MMR) deficiency. We wanted to implement this screening in a Danish region, optimize quality, and describe the results. Methods: All colorectal cancer (CRC) patients diagnosed from October 2010 to September 2012 in the Region of Southern Denmark were included. Immunohistochemistry (IHC) was performed for protein expression of the MLH1, PMS2, MSH2, and MSH6 genes followed by MLH1 methylation analysis in cases with loss of pMLH1. Hereafter the indications for genetic counselling were lack of any MMR-protein – and in case missing pMLH1only those with no promoter-methylation of MLH1. Patients were included irrespectively of stage, post-mor...
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