Molecular Imaging of Fibroblast Activation Protein Expression Using Labeled Technetium-99m HYNIC-FAPI

Inclusion Criteria: * Subject is \> 18 years of age * Clinical and radiological diagnosis of metastatic cancer with histological verification. * White blood cell count: \> 2.0 x 10\^9/L * Haemoglobin: \> 80 g/L * Platelets: \> 50.0 x 10\^9/L * Bilirubin =\< 2.0 times Upper Limit of Normal * Serum creatinine: Within Normal Limits * Blood glucose level not more than 5.9 mmol/L * A negative pregnancy test (serum beta-human chorionic gonadotropin, beta-HCG) at screening for all patients of childbearing potential. Sexually active women of childbearing potential participating in the study must use a medically acceptable form of contraception for at least 30 days after study termination * Subject is capable to undergo the diagnostic investigations to be performed in the study * Informed consent Exclusion Criteria: * Active current autoimmune disease or history of autoimmune disease * Active infection or history of severe infection within the previous 3 months (if clinically relevant at screening) * Known HIV positive or chronically active hepatitis B or C * Administration of other investigational medicinal product within 30 days of screening * Ongoing toxicity \> grade 2 from previous standard or investigational therapies, according to US National Cancer Institute's