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학술저널
저자정보
Kidong Kim (Seoul National University) Suhyun Hwangbo (Interdisciplinary Program in Bioinformatics Seoul National University) Hyojin Kim (Department of Pathology Seoul National University Bundang Hospital Seongnam Korea) Yong-Beom Kim (Seoul National University Bundang Hospital) Jae Hong No (Department of Obstetrics and Gynecology Seoul National University Bundang Hospital Seongnam Korea) Dong Hoon Suh (Department of Obstetrics and Gynecology Seoul National University Bundang Hospital Seongnam Korea) Taesung Park (Department of Statistics Seoul National University Seoul Korea)
저널정보
대한부인종양학회 Journal of Gynecologic Oncology Journal of Gynecologic Oncology Vol.33 No.3
발행연도
2022.5
수록면
1 - 9 (9page)
DOI
https://doi.org/10.3802/jgo.2022.33.e27

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Objective: The need to perform genetic sequencing to diagnose the polymerase epsilon exonuclease ( ) subtype of endometrial cancer (EC) hinders the adoption of molecular classification. We investigated clinicopathologic and protein markers that distinguish thefrom the copy number (CN)-low subtype in EC. Methods: Ninety-one samples (15 , 76 CN-low) were selected from The Cancer Genome Atlas EC dataset. Clinicopathologic and normalized reverse phase protein array expression data were analyzed for associations with the subtypes. A logistic model including selected markers was constructed by stepwise selection using area under the curve (AUC) from 5-fold cross-validation (CV). The selected markers were validated using immunohistochemistry (IHC) in a separate cohort. Results: Body mass index (BMI) and tumor grade were significantly associated with the subtype. With BMI and tumor grade as covariates, 5 proteins were associated with theEC subtypes. The stepwise selection method identified BMI, cyclin B1, caspase 8, and X-box binding protein 1 (XBP1) as markers distinguishing the from the CN-low subtype. The mean of CV AUC, sensitivity, specificity, and balanced accuracy of the selected model were 0.97, 0.91, 0.87, and 0.89, respectively. IHC validation showed that cyclin B1 expression was significantly higher in the than in the CN-low subtype and receiver operating characteristic curve of cyclin B1 expression in IHC revealed AUC of 0.683. Conclusion: BMI and expression of cyclin B1, caspase 8, and XBP1 are candidate markers distinguishing the from the CN-low subtype. Cyclin B1 IHC may replace sequencing in molecular classification of EC.

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