Correlation Between Estimated Glomerular Filtration Rate(eGFR) and Vascular Inflammation Measured by Positron Emission Tomography (PET) With 18F-fluoro-deoxyglucose (FDG)

Inclusion Criteria: 1. absence of prior cancer diagnosis or remission from cancer at the time of PET imaging and throughout the follow-up period; 2. \>=30 years of age; 3. no prior history of cardiovascular disease ; and 4. absence of acute or chronic inflammatory or autoimmune disease (based on documented medical history) or use of chronic anti-inflammatory therapy. Exclusion Criteria: 1. age \<35 years 2. presence of chronic inflammatory disease 3. use of anti-inflammatory medications 4. presence of active malignant cancer (defined as any radiological or pathological evidence of malignant cancer disease or undergoing chemotherapy or radiation therapy within 1 year before initial PET/CT and throughout the inter-scan duration).