The Efficacy of APT Magnetic Resonance Imaging in Predicting the Efficacy of Bevacizumab in Recurrent Malignant Gliomas

Recurrent Malignant Gliomas (RMG) have a very short survival time, and re-operation risk is large and failed to significantly improve the prognosis of patients. At present, targeted therapy with bevacizumab is effective in prolonging the progression of patients However, a considerable proportion of recurrent malignant gliomas are insensitive to bevacizumab, and therefore, using noninvasive imaging methods to predict which RMG is sensitive to bevacizumab therapy prior to targeted therapy is very important On the other hand, the current evaluation of bevacizumab is mainly based on the degree of gadolinium enhancement and tumor volume changes, repeated gadolinium injection may increase the risk of gadolinium ion deposition of brain tissue, and because of Bevacizumab only acting as an anti-tumor angiogenesis, and a false response may occur in assessing efficacy, which is a bias in the overall assessment of bevacizumab. Amide Proton Transfer (APT) is a new molecular imaging technique for the detection indirect of free protein and peptide concentrations based on chemical saturation exchange. Our previous studies have shown that APT signal is independent of gadolinium-enhanced imaging markers , The signal intensity is closely related to the density of tumor cells, cell proliferation and angiogenesis. Therefore, the imaging features and signal changes of APT can fully reflect the therapeutic effect of malignant glioma, and avoid the side effects caused by contrast injection. This study will be designed as multi-center, prospective, observational clinical research. 100 cases of RMG patients in Zhujiang Hospital and Nanfang Hospital will be recruited. The patients will be examined with conventional MRI and APT-MRI imaging of 3.0T high field MRI. The treatment of different types of RMG line will be scanned with APT protocol. The changes of signal intensity will be studied. The relationship between APT imaging characteristics and clinical end point events will be observed and compared with conventional MR imaging technique. Two techniques will be used to predict the the 6-month progression-free survival after bevacizumab treatment. The aim of this study is to determine whether APT can predict the efficacy of bevacizumab in the treatment of RMG, and which RMG is effective and sensitive to bevacizumab therapy .Also,we will evaluate the feasibility of APT-MR imaging as a surrogate biomarker for predicting the efficacy of targeted therapy and to establish the basic criteria for the selection of individualized targeted therapy regimens for RMG.