title: Increased risk for abnormalities on perioperative colon screening in patients with microsatellite instability-positive endometrial carcinoma.
abstract: Microsatellite instability (MSI) is a feature of certain hereditary and sporadic endometrial and colon cancers. We set out to determine whether molecular stratification of endometrial cancers based on tumor MSI status could help identify patients at increased risk for abnormalities found on perioperative colon screening. From a prospectively accrued series of 413 patients, medical records were reviewed from 94 patients with MSI positive (MSI+) and 94 patients with MSI negative (MSI-) endometrial cancers, matched by year of diagnosis. We reviewed clinicopathologic data and results of perioperative colon screening. Differences were analyzed using Fisher exact test and logistic regression analysis. There were no significant clinicopathologic differences between the two cohorts. Sixty-five percent of patients in each group underwent perioperative colon screening. However, patients with MSI+ cancers had a twofold increase in the frequency of colonic abnormalities (30% versus 14.8%, P = 0.044) over those with MSI- cancers. Furthermore, the only primary colon cancers (N = 2) were found in women with MSI+ endometrial cancers that were unmethylated at the MLH1 promoter. Our data suggest that patients with MSI+ endometrial cancers are at increased risk for abnormalities on perioperative colon screening. Those with MSI+MLH1 unmethylated cancers appear to be at highest risk.
authors.affiliation: Department of Obstetrics and Gynecology, Division of Gynecologic Oncology, Northwestern University Feinberg School of Medicine, Chicago, Illinois 60611, USA. bbuttin@nmff.org
authors.forename: B M
authors.initials: BM
authors.lastname: Buttin
authors.forename: M A
authors.initials: MA
authors.lastname: Powell
authors.forename: P J
authors.initials: PJ
authors.lastname: Goodfellow
authors.forename: S N
authors.initials: SN
authors.lastname: Lewin
authors.forename: R K
authors.initials: RK
authors.lastname: Gibb
authors.forename: D G
authors.initials: DG
authors.lastname: Mutch
mesh_terms: D048868:Adaptor Proteins, Signal Transducing; D002352:Carrier Proteins / Q000235:genetics; D003110:Colonic Neoplasms / Q000175:diagnosis* / Q000235:genetics*; D003113:Colonoscopy; D019175:DNA Methylation; D016889:Endometrial Neoplasms / Q000175:diagnosis* / Q000235:genetics*; D005260:Female; D006801:Humans; D008403:Mass Screening; D053842:Microsatellite Instability; D008875:Middle Aged; D000070957:MutL Protein Homolog 1; D009687:Nuclear Proteins / Q000235:genetics; D011401:Promoter Regions, Genetic / Q000235:genetics; D012307:Risk Factors
chemical_list: D048868:Adaptor Proteins, Signal Transducing; D002352:Carrier Proteins; C501486:MLH1 protein, human; D009687:Nuclear Proteins; D000070957:MutL Protein Homolog 1