Prospective temporal validation of mathematical models to calculate risk of endometrial malignancy in patients with postmenopausal bleeding

Research output: Contribution to journalArticle

Abstract

Objectives: To validate prospectively five mathematical models published in 2007 for calculating the risk of endometrial malignancy in a defined high-risk group of patients with postmenopausal bleeding and sonographic endometrial thickness≥4.5mm. Methods: Of 1012 consecutive patients, 379 fulfilled our inclusion criteria, which were the same as those of the original study in which the models were created (endometrial thickness≥4.5mm, no fluid in the uterine cavity, detectable Doppler signals in the endometrium). A standardized history was taken, and clinical and transvaginal grayscale and power Doppler ultrasound examinations were performed following the study protocol. All data were collected prospectively and the five models were applied prospectively to the study patients' data to assess their risk of endometrial malignancy. Using the histological diagnosis of the endometrium as gold standard, we calculated the area under the receiver-operating characteristics curve (AUC), and sensitivity, specificity and likelihood ratios when using the same cut-offs as in the original study, for each of the five models. Results: Ninety-three (25%) patients had malignant endometrium. The performance of the models was similar to that in the original study, with AUCs ranging from 0.86 to 0.90. The model with the best diagnostic performance included endometrial thickness, heterogeneous endometrial echogenicity and areas of densely packed vessels on power Doppler (AUC, 0.90; sensitivity, 81%; specificity, 84% at preselected cut-off). The models were well calibrated. Conclusions: On temporal validation, the five models for calculating the risk of endometrial malignancy in a defined high-risk group of patients retained their good diagnostic performance and were well calibrated. The models make it possible to reclassify high-risk patients as having a low or relatively low risk, moderately high risk or very high risk of endometrial cancer, and so can be used for individualized patient management.

Details

Authors
Organisations
External organisations
  • Skåne University Hospital
  • Vilnius University
Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Obstetrics, Gynecology and Reproductive Medicine

Keywords

  • Doppler ultrasound, Endometrial neoplasms, Logistic models, Postmenopausal bleeding, Ultrasonography, Validation studies
Original languageEnglish
Pages (from-to)649-656
JournalUltrasound in Obstetrics and Gynecology
Volume49
Issue number5
Early online date2017
Publication statusPublished - 2017
Publication categoryResearch
Peer-reviewedYes