Abstract
Objective
To investigate the value of apparent diffusion coefficient (ADC) histogram analysis in predicting pelvic lymph node (LN) metastasis in patients with cervical cancer undergoing surgery.
Materials and methods
A total of 162 cervical cancer patients who underwent radical abdominal hysterectomy with pelvic LN dissection performed with pelvic 3 T-MRI including diffusion-weighted imaging were enrolled in this study. The ADC histogram variables (minimum, mean, median, 97.5th percentile [ADC97.5], and maximum) of the tumors were developed using in-house software. For predicting pelvic LN metastasis, clinical and imaging variables were evaluated using logistic regression and receiver-operating characteristic (ROC) analyses.
Results
Pelvic LN metastasis was identified histopathologically in 50 patients (30.9%). In patients with LN metastasis, all ADC histogram variables were significantly different from those without LN metastasis (all p < 0.01). Univariate analysis demonstrated that long- and short-axis diameter of LN, MRI T-stage, squamous cell carcinoma antigen, tumor size, and the ADC97.5 were significantly associated with pelvic LN metastasis (all p < 0.05). However, multivariate analysis demonstrated that the ADC97.5 was the only independent predictor of pelvic LN metastasis (odds ratio, 0.996; p = 0.001). The area under the ROC curve of ADC97.5 was 0.782, which was the greatest among all variables. Interobserver agreement of all ADC histogram variables was fair to good.
Discussion
The ADC97.5 from histogram analysis may be a useful marker for the prediction of pelvic LN metastasis in patients with cervical cancer.
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Abbreviations
- LN:
-
Lymph node
- FIGO:
-
International Federation of Gynecology and Obstetrics
- DWI:
-
Diffusion-weighted imaging
- ADC:
-
Apparent diffusion coefficient
- SCC:
-
Squamous cell carcinoma
- THRIVE:
-
T1-weighted high-resolution isotropic volume examination
- ROI:
-
Region of interest
- ADC97.5 :
-
97.5th percentile ADC
- ADCmean :
-
Mean ADC
- ADCmax :
-
Maximum ADC
- ADCmin :
-
Minimum ADC
- ADCmedian :
-
Median ADC
- ICC:
-
Intraclass correlation coefficient
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Acknowledgements
We thank Na Young Hwang MS and Insuk Sohn, Ph.D. of Statistics and Data Center, Samsung Medical Center, for help with statistical assistance.
Funding
This study was funded by Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education (NRF-2017R1A2B4006020).
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Study concepts and design: CKK, JL. Acquisition of data: CKK, JL, and SYP. Analysis and interpretation of data: CKK, JL, and SYP. Drafting of manuscript: CKK and JL. Critical revision: CKK, JL, and SYP.
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All the authors (J.L., C.K.K., and S.Y.P.) declare that they have no conflict of interest.
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Lee, J., Kim, C.K. & Park, S.Y. Histogram analysis of apparent diffusion coefficients for predicting pelvic lymph node metastasis in patients with uterine cervical cancer. Magn Reson Mater Phy 33, 283–292 (2020). https://doi.org/10.1007/s10334-019-00777-9
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DOI: https://doi.org/10.1007/s10334-019-00777-9