Previous studies have shown active brown adipose tissue (BAT) is present in adults and may play important roles in regulating energy homeostasis. However, the majorities of these studies were done in patients undergoing scanning for cancer surveillance, and may not reflect BAT behavior in healthy individuals. In addition, little is known about the ethnic variation in BAT activity, particularly in Chinese adults. Due to the large amount in our cohort, we are able to look at the difference between subjects for cancer surveillance (CS) and subjects for medical check-up (MC), and to clarify the impact of clinical and lifestyle parameters.
||Time Perspective: Retrospective
||Retrospective Study on the Incidence and Factors of Brown Adipose Tissue in Adult Chinese
| Estimated Enrollment:
| Study Start Date:
| Estimated Study Completion Date:
| Estimated Primary Completion Date:
||December 2011 (Final data collection date for primary outcome measure)
We will study scanning database including data from July 2006 to June 2010 in Shanghai. BAT activity will be measured via 18F-fluorodeoxyglucose (FDG) positron emission tomography/computed tomography (PET/CT). Age, imaging date, sex, and outdoor temperature will be collected for all patients. To evaluate the effects of multiple metabolic parameters on BAT activity, we will collect height, body weight, fasting plasma glucose (FPG), medical history, diagnosis, smoking, alcohol consumption, exercise, liver triglyceride content, and thyroid metabolic activity for all patients with detectable BAT and their negative controls, consisting of two patients who underwent PET/CT scans at the same day but without detectable BAT.