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Non‐Gaussian diffusion imaging with a fractional order calculus model to predict response of gastrointestinal stromal tumor to second‐line sunitinib therapy
Author(s) -
Tang Lei,
Sui Yi,
Zhong Zheng,
Damen Frederick C.,
Li Jian,
Shen Lin,
Sun Yingshi,
Zhou Xiaohong Joe
Publication year - 2018
Publication title -
magnetic resonance in medicine
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.696
H-Index - 225
eISSN - 1522-2594
pISSN - 0740-3194
DOI - 10.1002/mrm.26798
Subject(s) - sunitinib , receiver operating characteristic , medicine , logistic regression , effective diffusion coefficient , gist , nuclear medicine , mathematics , radiology , stromal cell , magnetic resonance imaging , cancer
Purpose To demonstrate the clinical value of a non‐Gaussian diffusion model using fractional order calculus (FROC) for early prediction of the response of gastrointestinal stromal tumor to second‐line sunitinib targeted therapy. Methods Fifteen patients underwent sunitinib treatment after imatinib resistance. Diffusion‐weighted imaging with multiple b‐values was performed before treatment (baseline) and 2 weeks (for early prediction of response) after initiating sunitinib treatment. Conventional MRI images at 12 weeks were used to determine the good and poor responders according to the modified Choi criteria for MRI. Diffusion coefficient D, fractional order parameter β (which correlates to intravoxel tissue heterogeneity), and a microstructural quantity µ were calculated using the FROC model. The FROC parameters and the longest diameter of the lesion, as well as their changes after 2 weeks of treatment, were compared between the good and poor responders. Additionally, the pretreatment FROC parameters were individually combined with the change in D (ΔD) using a logistic regression model to evaluate response to sunitinib treatment with a receiver operating characteristic analysis. Results Forty‐two good‐responding and 32 poor‐responding lesions were identified. Significant differences were detected in pretreatment β (0.67 versus 0.74, P = 0.011) and ΔD (45.7% versus 12.4%, P = 0.001) between the two groups. The receiver operating characteristic analysis showed that ΔD had a significantly higher predictive power than the tumor size change (area under the curve: 0.725 versus 0.580; 0.95 confidence interval). When ΔD was combined with pretreatment β, the area under the curve improved to 0.843 with a predictive accuracy of 75.7% (56 of 74). Conclusions The non‐Gaussian FROC diffusion model showed clinical value in early prediction of gastrointestinal stromal tumor response to second‐line sunitinib targeted therapy. The pretreatment FROC parameter β can increase the predictive accuracy when combined with the change in diffusion coefficient during treatment. Magn Reson Med 79:1399–1406, 2018. © 2017 International Society for Magnetic Resonance in Medicine.