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TCGA molecular subgroups and FIGO grade in endometrial endometrioid carcinoma

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Abstract

Background

International Federation of Gynecology and Obstetrics (FIGO) grade is a crucial factor in the current system for the risk stratification of endometrial endometrioid carcinoma (EC). The Cancer Genome Atlas (TCGA) demonstrated four molecular prognostic subgroups for EC: POLE (good prognosis), microsatellite-instable (MSI, intermediate prognosis), copy-number-high (CNH, poor prognosis), and copy-number-low (CNL, variable prognosis).

Objective

To assess how the prevalence of the TCGA molecular subgroups changes from low-grade (G1-2) to high-grade (G3) EC, to understand how it may affect the current risk-assessment system.

Methods

A systematic review and meta-analysis was carried out by searching seven electronic databases from January 2013 to September 2019 for studies assessing the TCGA classification G1–2 and G3 EC. Pooled prevalence of the TCGA subgroups was calculated in EC. The association of each subgroup with grade was assessed using odds ratio (OR), with a significant p value < 0.05.

Results

Nine studies with 3185 patients were included. G3 EC showed significantly higher prevalence of the POLE subgroup (12.1% vs 6.2%; OR = 2.13; p = 0.0001), of the MSI subgroup (39.7% vs 24.7%; OR = 2.15; p = 0.0003) and of the CNH subgroup (21.3% vs 4.7%; OR = 5.25; p < 0.00001), and significantly lower prevalence of the CNL subgroup (28% vs 63.5%; OR = 0.2; p < 0.00001) than G1–2 EC.

Conclusion

The prevalence of the TCGA subgroups is not in accordance with the prognostic value of FIGO grade, indicating that the current risk stratification of EC will be heavily affected by molecular signature.

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Funding

No financial support was received for this study.

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Authors

Contributions

AT, AR independently assessed electronic search, eligibility of the studies, inclusion criteria, risk of bias, data extraction and data analysis. Disagreements were resolved by discussion with AM, GB, PA, GFZ, LI and FZ. AM, GB and PA contributed to the elaboration of methods for risk of bias assessment, data extraction and analysis. AT, AR, AM, LI and FZ conceived the study; GB, PA, GFZ, LI and FZ worked on the design of the study; AT, AR, AM, GB, PA, GFZ, LI and FZ worked on the manuscript preparation; GFZ, LI and FZ supervised the whole study.

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Correspondence to Antonio Raffone.

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Travaglino, A., Raffone, A., Mollo, A. et al. TCGA molecular subgroups and FIGO grade in endometrial endometrioid carcinoma. Arch Gynecol Obstet 301, 1117–1125 (2020). https://doi.org/10.1007/s00404-020-05531-4

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  • DOI: https://doi.org/10.1007/s00404-020-05531-4

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