Arterial Spin Labeled Perfusion MRI for the Evaluation of Response to Tyrosine Kinase Inhibition Therapy in Metastatic Renal Cell Carcinoma
Abstract
Perfusion of renal cell carcinoma metastases, as quantified with arterial spin labeling MRI, may be useful in selecting candidates for antiangiogenic therapy and in helping detect the onset of treatment resistance.
Background
Tumor perfusion may inform therapeutic response and resistance in metastatic renal cell carcinoma (RCC) treated with antiangiogenic therapy.
Purpose
To determine if arterial spin labeled (ASL) MRI perfusion changes are associated with tumor response and disease progression in metastatic RCC treated with vascular endothelial growth factor receptor (VEGFR) tyrosine kinase inhibitors (TKIs).
Materials and Methods
In this prospective study, metastatic RCC perfusion was measured with ASL MRI before and during sunitinib or pazopanib therapy between October 2008 and March 2014. Objective response rate (ORR) and progression-free survival (PFS) were calculated. Perfusion was compared between responders and nonresponders at baseline, at week 2, after cycle 2 (12 weeks), after cycle 4 (24 weeks), and at disease progression and compared with the ORR by using the Wilcoxon rank sum test and with PFS by using the log-rank test.
Results (data was partially omitted)
Seventeen participants received sunitinib ; 11 participants received pazopanib. Responders had higher baseline tumor perfusion than nonresponders. Perfusion decreased from baseline to week 2, after cycle 2, and after cycle 4. Interval reduction in perfusion at those three time points was not associated with ORR. Perfusion increased from cycle 4 to disease progression.
Conclusion
Arterial spin labeled perfusion MRI may assist in identifying responders to vascular endothelial growth factor receptor tyrosine kinase inhibitors and may help detect early evidence of disease progression in patients with metastatic renal cell carcinoma.
© RSNA, 2020
Notes:
tyrosine kinase inhibitor酪氨酸酶抑制劑
antiangiogenic抗血管生成的
arterial spin labeled動脈自旋標記
endothelial growth factor receptor血管內皮生長因子受體
sunitinib舒尼替尼
pazopanib帕㘴帕尼
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