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Preoperative prediction of deep myometrial invasion and tumor grade for stage I endometrioid adenocarcinoma: a simple method of measurement on DWI

  • Magnetic Resonance
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Abstract

Objectives

To explore the utility of the tumor area ratio (TAR) for predicting deep myometrial invasion and tumor grade in stage I endometrioid adenocarcinoma (EEA).

Methods

We retrospectively evaluated 86 patients with International Federation of Gynecology and Obstetrics (FIGO) stage I EEA. All patients underwent unenhanced contrast MRI and diffusion-weighted imaging (DWI) procedures. The volume and maximum area of the tumor and uterus were obtained, and the tumor volume ratio (TVR) and TAR were calculated. The Kruskal-Wallis test and Mann-Whitney U test were used to compare the differences in indexes (TVR and TAR) between the different tumor grades and between superficial and deep myometrial invasion.

Results

The TVR and TAR values for deep myometrial invasion and high-grade EEA tumors were significantly higher than the values for superficial myometrial invasion and low-grade tumors (all p = 0.000). According to the receiver-operating characteristic (ROC) curve, the area under the curve (AUC) was significantly higher for TAR than for TVR for tumors with deep myometrial invasion (0.936 vs. 0.844, p = 0.045). However, no significant differences in the AUCs for TVR and TAR were observed between high- and low-grade tumors (0.865 vs. 0.863, p = 0.956). A TAR ≥ 34.6% predicted deep myometrial invasion in EEA with a sensitivity, specificity, and accuracy of 85.0%, 84.8%, and 86.0%, respectively. A TAR ≥ 38.9% predicted high-grade tumors with a sensitivity, specificity, and accuracy of 83.3%, 81.1%, and 82.6%, respectively.

Conclusion

TAR is useful for predicting deep myometrial invasion and high-grade stage I EEA

Key Points

TAR is useful for predicting risk factors for EEA.

TAR is easy to obtain and has high accuracy.

TAR has excellent interobserver repeatability agreement (ICC range 95.1–99.6%).

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Abbreviations

AUC:

Area under the curve

CE-MRI:

Contrast-enhanced MRI

CI:

Confidence interval

DWI:

Diffusion-weighted imaging

EC:

Endometrial cancer

EEA:

Endometrioid adenocarcinoma

FIGO:

International Federation of Gynecology and Obstetrics

ICC:

Interobserver correlation coefficient

MRI:

Magnetic resonance imaging

NPV:

Negative predictive value

PPV:

Positive predictive value

ROC:

Receiver-operating characteristic curve

TAR:

Tumor area ratio

TV:

Tumor volume

TVR:

Tumor volume ratio

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Funding

This study received funding from the Fundamental Research Funds for the Central Universities of China (1191320118).

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Authors and Affiliations

Authors

Corresponding author

Correspondence to Bin Yan.

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Guarantor

The scientific guarantor of this publication is Bin Yan, Department of Radiology, Shaanxi Provincial Tumor Hospital, Xi'an Jiaotong University, Xi'an Shaanxi, P.R China.

Conflict of interest

The authors of this manuscript declare no relationships with any companies, whose products or services may be related to the subject matter of the article.

Statistics and biometry

One of the authors (Wenjun Liu) has significant statistical expertise.

Informed consent

Written informed consent was obtained from all subjects (patients) in this study.

Ethical approval

Institutional Review Board approval was obtained.

Study subjects or cohorts overlap

Some study subjects or cohorts have been previously reported in: Yan B et al Can the apparent diffusion coefficient differentiate the grade of endometrioid adenocarcinoma and the histological subtype of endometrial cancer? Acta Radiol, 2018, 59:363-370.

Methodology

• retrospective

• diagnostic or prognostic study

• performed at one institution

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Yan, B., Liang, X., Zhao, T. et al. Preoperative prediction of deep myometrial invasion and tumor grade for stage I endometrioid adenocarcinoma: a simple method of measurement on DWI. Eur Radiol 29, 838–848 (2019). https://doi.org/10.1007/s00330-018-5653-2

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  • DOI: https://doi.org/10.1007/s00330-018-5653-2

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