15 August 2015 : Animal Research
Application of Volumetric Modulated Arc Therapy and Simultaneous Integrated Boost Techniques to Prepare “Safe Margin” in the Rabbit VX2 Limb Tumor ModelChong-Wen WangABCDEF, Yang ZhouB, Jing-Ping BaiAG, Hao LiuE, Yan LiuD, Guang-Li ShiB, Jiao-Jiao DingD, Dong-Hui MaE, Wen-Ting LiD, Peng-Ming XieC, Yue YanB
Med Sci Monit 2015; 21:2397-2405
BACKGROUND: In this study, we aimed to establish the rabbit VX2 limb tumor model, and then prepare a “necrotic zone” as a safe margin by volumetric modulated arc therapy and simultaneous integrated boost (VMAT-SIB) technique applied in the areas where the tumor is located adjacent to the bone (GTVboost area).
MATERIAL AND METHODS: Rabbits in the control group (n=10) were not treated, while those in the test group (n=10) were treated with the SIB schedule delivering a dose of 40Gy, 35Gy, 30Gy, and 25Gy to the GTVboost, GTV (gross tumor volume), CTV (clinical target volume), and PTV (planning target volume) in 10 fractions. Magnetic resonance diffusion-weighted imaging (MRDWI), 3-dimensional power Doppler angiography (3D-PDA), and histological changes were observed after radiotherapy.
RESULTS: After radiotherapy, the two groups showed a significant difference in the GTVboost area. In the test group, the tumor necrosis showed a significantly low signal in DWI and high signal in apparent diffusion coefficient (ADC) maps. The 3D-PDA observation showed that tumor vascular structures decreased significantly. Histological analysis demonstrated that a necrotic zone could be generated in the GTVboost area, and microscopic examination observed cell necrosis and fibroplasia.
CONCLUSIONS: This studies demonstrated the feasibility of using VMAT-SIB technique in the rabbit VX2 limb tumor model. The formation of a necrotic zone can be effectively defined as safe margin in the GTVboost area. showing potential clinical applicability.
Keywords: Extremities, Diffusion Magnetic Resonance Imaging, Angiography, Imaging, Three-Dimensional, Magnetic Resonance Imaging, Necrosis, Rabbits, Radiotherapy Dosage, Radiotherapy, Intensity-Modulated - methods, Sarcoma, Experimental - radiotherapy, Soft Tissue Neoplasms - radiotherapy, Ultrasonography, Doppler
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