PT - JOURNAL ARTICLE AU - KENICHI CHIKATANI AU - NORIYASU CHIKA AU - OKIHIDE SUZUKI AU - TAKEHIKO SAKIMOTO AU - KEIICHIRO ISHIBASHI AU - HIDETAKA EGUCHI AU - YASUSHI OKAZAKI AU - HIDEYUKI ISHIDA TI - A Model for Predicting DNA Mismatch Repair-deficient Colorectal Cancer AID - 10.21873/anticanres.14441 DP - 2020 Aug 01 TA - Anticancer Research PG - 4379--4385 VI - 40 IP - 8 4099 - http://ar.iiarjournals.org/content/40/8/4379.short 4100 - http://ar.iiarjournals.org/content/40/8/4379.full SO - Anticancer Res2020 Aug 01; 40 AB - Background/Aim: Identifying patients with DNA mismatch repair-deficient (dMMR) colorectal cancer (CRC) is vital to improve treatment and identify patients with Lynch syndrome (LS). We developed a prediction model for dMMR CRC using clinicopathologic features. Patients and Methods: We reviewed the medical records of 1,147 patients who underwent resection of stage I-IV CRC in whom universal screening for LS using immunohistochemistry for MMR proteins had performed. Univariate and multivariate logistic regression analyses were used to build a prediction model of dMMR CRC. Results: The prevalence of dMMR CRC was 5.2%. Age (≥75 years), tumor location (right-sided colon), main histologic features (poor differentiation), maximum tumor size (≥65 mm), and stage (I/II) were independent significant variables related to dMMR. We created a formula for predicting the likelihood of dMMR, and the probability ranged from 0.2% to 83%. Conclusion: dMMR CRC can be identified efficiently using clinicopathologic features obtained in daily clinical practice.