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.
Radiotherapy has a systemic inhibitory effect on non-irradiated lesions (abscopal effect) in addition to local antitumor effects, and currently no biomarkers are used for the prediction of the abscopal effect of radiotherapy in standard clinical practice. Our recent preclinical studies identified ICAM-1 as a potential predictive biomarker for the radiotherapy-induced abscopal effect. In this clinical trial, we aim to investigate whether the ICAM-1-targeting radiotracer 68Ga-ICAM-1pep could be used for PET imaging of tumor responses to radiotherapy in cancer patients. PET/CT imaging of 68Ga-ICAM-1pep will be performed in patients before and after radiotherapy.
Study Type
INTERVENTIONAL
Allocation
RANDOMIZED
Purpose
DIAGNOSTIC
Masking
NONE
Enrollment
20
68Ga-ICAM-1pep PET/CT: after intravenous injection of 2.96 MBq/kg body weight of quality-controlled 68Ga-ICAM-1pep, a Siemens Biograph PET/CT scan will be applied within 1 h, and the scan range will be from the top of the head to 1/3 of the upper thigh.
Beijing Cancer Hospital
Beijing, Beijing Municipality, China
RECRUITINGQuantitate the standardized uptake values (SUVs) of 68Ga-ICAM-1pep at baseline.
Perform PET/CT imaging using 68Ga-ICAM-1pep before radiotherapy.The semiquantitative analysis will be performed by the same nuclear medicine physician for all cases, and the standardized uptake values (SUVs) of 68Ga-ICAM-1pep in the tumor lesions will be measured.
Time frame: At baseline
Characterize changes in the standardized uptake values (SUVs) of 68Ga-ICAM-1pep during radiotherapy.
Perform PET/CT imaging using 68Ga-ICAM-1pep after radiotherapy. The semiquantitative analysis will be performed by the same nuclear medicine physician for all cases, and the standardized uptake values (SUVs) of 68Ga-ICAM-1pep in the tumor lesions will be measured. The SUVs of 68Ga-ICAM-1pep in the tumor lesions after radiotherapy will be compared with that at the baseline.
Time frame: 3 to 4 weeks after beginning of radiotherapy
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