Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
8131248 | Ultrasound in Medicine & Biology | 2018 | 13 Pages |
Abstract
Combretastatin A4 phosphate (CA4P) is a vascular disrupting agent that rapidly shuts down blood supply to tumors. Early monitoring of tumor perfusion plays a crucial role in determining the optimal strategy to managing treatment and guiding future therapy. The aim of this study was to investigate the potential value of dynamic contrast-enhanced ultrasound (CEUS) in quantitative evaluation of tumor perfusion at an early stage in CA4P therapy. Central and peripheral perfusion of tumors was detected by CEUS pre-treatment (0âh) and 2, 12 and 48âh after CA4P injection. Two perfusion parameters, maximum intensity (IMAX) and time to peak (TTP), were calculated from the time-intensity curve. After CEUS, the efficacy of CA4P was immediately confirmed by immunofluorescence assay and hematoxylin and eosin, Hoechst 33342 and fluorescein isothiocyanate-lectin staining. In CEUS of the center region of tumors, IMAX gradually decreased from 0 to 12âh and regrew at 48âh (pâ<â0.01). TTP increased only at 2âh. In the peripheral regions, IMAX did not change obviously from 0 to 12âh (pâ>â0.05) and just increased at 48âh (pâ<â0.01). The TTP of peripheral regions had the same tendency to vary tendency as that of center regions. In addition, microvascular density (MVD), vascular perfusion and necrotic area of the tumor were quantitatively analyzed. A close correlation between IMAX and MVD was observed in the center areas of tumors (râ=â0.72, pâ<â0.01), whereas the correlation between IMAX and MVD in peripheral areas was weak (râ=â0.37, pâ<â0.01). However, IMAX was positively correlated with tumor perfusion in both center and peripheral areas of tumors (râ=â0.82, pâ<â0.01, and râ=â0.63, pâ<â0.01, respectively). Consequently, IMAX was a reliable indicator of tumor perfusion evaluation by CEUS. The use of CEUS to quantify tumor perfusion could a promising method for the early detection of tumor responses in anti-vascular treatment.
Keywords
Related Topics
Physical Sciences and Engineering
Physics and Astronomy
Acoustics and Ultrasonics
Authors
Pingyu Zhang, Yihan Chen, JinFeng Liu, Yali Yang, Qing Lv, Jing Wang, Li Zhang, Mingxing Xie,