Abstract
Background
The diagnostic performances of the International Ovarian Tumor Analysis (IOTA) ultrasound-based logistic regression model (LR2) and magnetic resonance imaging (MRI) in discriminating between benign and malignant adnexal masses have not been directly compared in a single study.
Methods
Using the IOTA LR2 model and subjective interpretation of MRI findings by experienced radiologists, 265 consecutive patients with adnexal masses were preoperatively evaluated in two hospitals between February 2014 and December 2015. Definitive histological diagnosis of excised tissues was used as a gold standard.
Results
From the 265 study subjects, 54 (20.4%) tumors were histologically diagnosed as malignant (including 11 borderline and 3 metastatic tumors). Preoperative diagnoses of malignant tumors showed 91.7% total agreement between IOTA LR2 and MRI, with a kappa value of 0.77 [95% confidence interval (CI), 0.68–0.86]. Sensitivity of IOTA LR2 (0.94, 95% CI, 0.85–0.98) for predicting malignant tumors was similar to that of MRI (0.96, 95% CI, 0.87–0.99; P = 0.99), whereas specificity of IOTA LR2 (0.98, 95% CI, 0.95–0.99) was significantly higher than that of MRI (0.91, 95% CI, 0.87–0.95; P = 0.002). Combined IOTA LR2 and MRI results gave the greatest sensitivity (1.00, 95% CI, 0.93–1.00) and had similar specificity (0.91, 95% CI, 0.86–0.94) to MRI.
Conclusions
The IOTA LR2 model had a similar sensitivity to MRI for discriminating between benign and malignant tumors and a higher specificity compared with MRI. Our findings suggest that the IOTA LR2 model, either alone or in conjunction with MRI, should be included in preoperative evaluation of adnexal masses.
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Acknowledgements
We thank Mr. Tetsutaro Hamano (P4 Statistics Co. Ltd., Tokyo, Japan) for statistical analysis. We are also grateful to all the women who participated in this study.
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Shimada, K., Matsumoto, K., Mimura, T. et al. Ultrasound-based logistic regression model LR2 versus magnetic resonance imaging for discriminating between benign and malignant adnexal masses: a prospective study. Int J Clin Oncol 23, 514–521 (2018). https://doi.org/10.1007/s10147-017-1222-y
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DOI: https://doi.org/10.1007/s10147-017-1222-y