Anatomic pathology selected abstracts
October 2024—Screening for colorectal cancers can involve assessing mismatch repair deficiency or microsatellite instability to identify people with Lynch syndrome, the most common hereditary syndrome causing colorectal cancer. Advanced adenomas are considered immediate precursor lesions of colorectal cancer. The authors conducted a study in which they investigated the relevance of microsatellite instability screening of advanced adenomas for Lynch syndrome in population screening. They selected advanced adenomas (n=1,572) from the Dutch colorectal cancer population screening program. All were reviewed and met one or more of the following criteria: tubulovillous (n=848, 54 percent) or villous (n=118, 7.5 percent) adenoma, diameter of 1 cm or more (n=1,286, 82 percent), or high-grade dysplasia (n=176, 11 percent).