- At 8 weeks post-infusion, we will evaluate the tumor by using a CT scan and/or MRI. We will also perform a PET or PET/CT scan if the research doctor feels it is necessary. We may do a chest CT scan to see if the tumor has spread to the lungs and an abdominal/pelvic CT scan or MRI if the participant has symptoms that suggesting that there may be tumor in the liver, or a bone scan to see if there is tumor in the bones.