68Ga-ICAM-1pep PET/CT Imaging of Tumor Responses to Radiotherapy in Cancer Patients

This is an open-label positron emission tomography/computed tomography (PET/CT) study to investigate the clinical predictive value of 68Ga-ICAM-1pep in metastatic cancer patients receiving radiotherapy. A single dose of 2.96 MBq/kg body weight of 68Ga-ICAM-1pep will be injected intravenously. The visual and semiquantitative methods will be used to assess the PET/CT images.