A Study to Evaluate GEH200520/GEH200521 (18F) Safety and Tolerability When Used for PET Scans in Patients With Solid Tumour Malignancies

Administration of GEH200520 Injection followed within 2 to 4 minutes by GEH200521 (18F) Injection followed by a 10mL saline flush

Dynamic whole-body PET/CT scan starting at the time of injection (sequential scans over 90 minutes anticipated) followed by static whole-body scans starting at 150 minutes, 270 minutes, and (optional) 24 hours after injection.

Administration of GEH200520 Injection followed within 2 to 4 minutes by GEH200521 (18F) Injection followed by a 10mL saline flush

Whole-body PET/CT scan (up to 30 min). Exact timing will be determined from Part A. An optional dynamic scan may be acquired in addition to the required whole-body PET/CT scan at each imaging visit.