Inclusion Criteria:  Patients who underwent CT-scan with suspicion of renal tumor and the scans show no sign of renal cancer. For patient with ccRCC or oncocytoma, they should have a histological verified tumor (Biopsy or surgical specimen) Sign up information consent Can perform protocol procedure  Exclusion Criteria:  Non-clear cell Renal cell carcinoma RCC with pure sarcomatoid differentiation, also called sarcoma of the kidney Use of heparin for concurrent disease in need of blood dilution (e.g. ongoing deep vein thrombosis or lung emboli). Note: use of of heparin for thrombus prophylaxis in conjunction with primary surgery or postoperatively ≤4 weeks will be allowed.