[18F]FLT-PET as a Predictive Imaging Biomaker of Treatment Responses to Regorafenib

Regorafenib is approved in the treatment for metastatic colorectal cancer patients who have been progressed after standard therapies, however, there has not been a predictive biomarker. The investigators designed this study to investigate whether \[18F\]FLT-PET might paly a role as a predictive imaging biomarker of treatment responses to regorafenib.