Liu Jiayi, Li Ning, Li Li, Li Danye, Liu Kai, Zhao Lingyun, Tang Jintian, Li Liya
Department of Oncology, Xiangya Hospital, Central South University, Changsha, Hunan 410008, P.R. China ; Department of Engineering Physics, Institute of Medical Physics and Engineering, Key Laboratory of Particle and Radiation Imaging, Ministry of Education, Tsinghua University, Beijing 100084, P.R. China.
Oncol Lett. 2013 Dec;6(6):1550-1558. doi: 10.3892/ol.2013.1618. Epub 2013 Oct 11.
Magnetic-mediated hyperthermia (MMH) is a promising local thermotherapy approach for cancer treatment. The present study investigated the feasibility and effectiveness of MMH in esophageal cancer using a rabbit tumor model. The therapeutic effect of two hyperthermia approaches, magnetic stent hyperthermia (MSH), in which heat is induced by the clinical stent that is placed inside the esophagus, and magnetic fluid hyperthermia (MFH), where magnetic nanoparticles are applied as the agent, was systematically evaluated. A rabbit esophageal tumor model was established by injecting VX2 carcinoma cells into the esophageal submucosa. The esophageal stent was deployed perorally into the tumor segment of the esophagus. For the MFH, magnetic nanoparticles (MNPs) were administered to the rabbits by intratumoral injection. The rabbits were exposed under a benchtop applicator using an alternative magnetic field (AMF) with 300 kHz frequency for the hyperthermia treatment. The results demonstrated that esophageal stents and MNPs had ideal inductive heating properties upon exposure under an AMF of 300 kHz. MSH, using a thermal dose of 46°C with a 10-min treatment time, demonstrated antitumor effects on the rabbit esophageal cancer. However, the rabbit esophageal wall is not heat-resistant. Therefore, a higher temperature or longer treatment time may lead to necrosis of the rabbit esophagus. MFH has a significant antitumor effect by confining the heat within the tumor site without damaging the adjacent normal tissues. The present study indicates that the two hyperthermia procedures have therapeutic effects on esophageal cancer, and that MFH may be more specific than MSH in terms of temperature control during the treatment.
磁介导热疗(MMH)是一种很有前景的用于癌症治疗的局部热疗方法。本研究使用兔肿瘤模型探究了MMH在食管癌治疗中的可行性和有效性。系统评估了两种热疗方法的治疗效果,即磁支架热疗(MSH),通过置于食管内的临床支架诱导产热;以及磁流体热疗(MFH),使用磁性纳米颗粒作为介质。通过将VX2癌细胞注射到食管黏膜下层建立兔食管肿瘤模型。经口将食管支架置入食管肿瘤段。对于MFH,通过瘤内注射给兔施用磁性纳米颗粒(MNPs)。使用频率为300 kHz的交变磁场(AMF)在台式施加器下对兔进行热疗治疗。结果表明,食管支架和MNPs在300 kHz的AMF照射下具有理想的感应加热特性。MSH采用46°C的热剂量和10分钟的治疗时间,对兔食管癌显示出抗肿瘤作用。然而,兔食管壁不耐热。因此,更高的温度或更长的治疗时间可能导致兔食管坏死。MFH通过将热量限制在肿瘤部位而不损伤相邻正常组织,具有显著的抗肿瘤作用。本研究表明,这两种热疗方法对食管癌均有治疗效果,并且在治疗过程中MFH在温度控制方面可能比MSH更具特异性。
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