Abstract
Purpose
To determine if magnetic resonance imaging (MRI) histogram analyses can help predict response to chemotherapy in patients with colorectal hepatic metastases by using response evaluation criteria in solid tumours (RECIST1.1) as the reference standard.
Materials and methods
Standard MRI including diffusion-weighted imaging (b=0, 500 s/mm2) was performed before chemotherapy in 53 patients with colorectal hepatic metastases. Histograms were performed for apparent diffusion coefficient (ADC) maps, arterial, and portal venous phase images; thereafter, mean, percentiles (1st, 10th, 50th, 90th, 99th), skewness, kurtosis, and variance were generated. Quantitative histogram parameters were compared between responders (partial and complete response, n=15) and non-responders (progressive and stable disease, n=38). Receiver operator characteristics (ROC) analyses were further analyzed for the significant parameters.
Results
The mean, 1st percentile, 10th percentile, 50th percentile, 90th percentile, 99th percentile of the ADC maps were significantly lower in responding group than that in non-responding group (p=0.000–0.002) with area under the ROC curve (AUCs) of 0.76–0.82. The histogram parameters of arterial and portal venous phase showed no significant difference (p>0.05) between the two groups.
Conclusion
Histogram-derived parameters for ADC maps seem to be a promising tool for predicting response to chemotherapy in patients with colorectal hepatic metastases.
Key Points
• ADC histogram analyses can potentially predict chemotherapy response in colorectal liver metastases.
• Lower histogram-derived parameters (mean, percentiles) for ADC tend to have good response.
• MR enhancement histogram analyses are not reliable to predict response.
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Abbreviations
- MRI:
-
magnetic resonance imaging
- RECIST:
-
response evaluation criteria in solid tumours
- ADC:
-
apparent diffusion coefficient
- ROC:
-
receiver operator characteristics
- AUCs:
-
area under the ROC curve
- CLM:
-
colorectal liver metastasis
- SOS:
-
sinusoidal obstruction syndrome
- CT:
-
computed tomography
- PET:
-
positron emission tomography
- DWI:
-
diffusion weighted imaging
- TR:
-
repetition time
- TE:
-
echo time
- VIBE:
-
volumetric interpolated breath-hold examination
- DCE:
-
dynamic contrast enhanced
- AP:
-
arterial phase
- PVP:
-
portal venous phase
- ROI:
-
region of interest
- CR:
-
complete response
- PR:
-
partial response
- PD:
-
progressive disease
- SD:
-
stable disease
- PPV:
-
positive predictive values
- NPV:
-
negative predictive values
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Acknowledgments
The scientific guarantor of this publication is Sheng-Xiang Rao. 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. This study has received funding by the National Science Foundation of China (Grant No. 81371543. No complex statistical methods were necessary for this paper. Institutional Review Board approval was obtained. Written informed consent was waived by the Institutional Review Board. Methodology: retrospective, case-control study, performed at one institution.
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Liang, HY., Huang, YQ., Yang, ZX. et al. Potential of MR histogram analyses for prediction of response to chemotherapy in patients with colorectal hepatic metastases. Eur Radiol 26, 2009–2018 (2016). https://doi.org/10.1007/s00330-015-4043-2
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DOI: https://doi.org/10.1007/s00330-015-4043-2