Published in:
Open Access
01-09-2017 | Oncology
Primary and metastatic ovarian cancer: Characterization by 3.0T diffusion-weighted MRI
Authors:
Auni Lindgren, Maarit Anttila, Suvi Rautiainen, Otso Arponen, Annukka Kivelä, Petri Mäkinen, Kirsi Härmä, Kirsi Hämäläinen, Veli-Matti Kosma, Seppo Ylä-Herttuala, Ritva Vanninen, Hanna Sallinen
Published in:
European Radiology
|
Issue 9/2017
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Abstract
Objectives
We aimed to investigate whether apparent diffusion coefficients (ADCs) measured by 3.0T diffusion-weighted magnetic resonance imaging (DWI) associate with histological aggressiveness of ovarian cancer (OC) or predict the clinical outcome. This prospective study enrolled 40 patients with primary OC, treated 2011-2014.
Methods
DWI was performed prior to surgery. Two observers used whole lesion single plane region of interest (WLsp-ROI) and five small ROIs (S-ROI) to analyze ADCs. Samples from tumours and metastases were collected during surgery. Immunohistochemistry and quantitative reverse transcription polymerase chain reaction (qRT-PCR) were used to measure the expression of vascular endothelial growth factor (VEGF) and its receptors.
Results
The interobserver reliability of ADC measurements was excellent for primary tumours ICC 0.912 (WLsp-ROI). Low ADCs significantly associated with poorly differentiated OC (WLsp-ROI P = 0.035). In primary tumours, lower ADCs significantly associated with high Ki-67 (P = 0.001) and low VEGF (P = 0.001) expression. In metastases, lower ADCs (WLsp-ROI) significantly correlated with low VEGF receptors mRNA levels. ADCs had predictive value; 3-year overall survival was poorer in patients with lower ADCs (WLsp-ROI P = 0.023, S-ROI P = 0.038).
Conclusion
Reduced ADCs are associated with histological severity and worse outcome in OC. ADCs measured with WLsp-ROI may serve as a prognostic biomarker of OC.
Key Points
• Reduced ADCs correlate with prognostic markers: poor differentiation and high Ki-67 expression
• ADCs also significantly correlated with VEGF protein expression in primary tumours
• Lower ADC values are associated with poorer survival in ovarian cancer
• Whole lesion single plane-ROI ADCs may be used as a prognostic biomarker in OC