Increased Arterial PET/CT ¹⁸F-Fluorodeoxyglucose Uptake in Obese and Overweight Patients

Objectives. - We aimed to investigate the association between BMI and early atherosclerotic activity in cancer patients. We also compared the inflammatory and macroscopic calcification processes of atherosclerosis in the aortic segments and large arteries by ¹⁸F-FDG PET/CT of between normal and high BMI patients. Methods. - We conducted a retrospective review of cancer patients presented to our institution within the period between February and May 2018. Patients were classified according to their BMI into two groups: normal BMI group and high BMI group. Data of average SUV_max and SUV_mean for four segments of the aorta, common iliac arteries, and femoral arteries were estimated and compared between both groups. Moreover, the macroscopic calcification on CT images for each vascular section was also reported. Results. - Ninety-eight patients were classified into two groups: normal BMI group (n = 52; 53.1%), and high BMI group (n = 46; 46.9%). Average SUV_max was significantly higher in obese participants in all arterial segments (P < 0.05). However, the SUV_mean was significantly higher in obese patients in only three arterial segments aortic arch, left femoral artery and descending thoracic aorta (P < 0.05).Moreover, the differences between the two study groups in terms of the frequency of macroscopic calcifications were not statistically significant for all vascular segments. BMI positively correlated with SUV_max and SUV_mean of the vascular segments (r value from 0,219 to 0,575/p value between 0,023 and 0,0001). Conclusions. - Fluorine-18-FDG PET/CT imaging revealed that patients with high BMI have more accelerated atherosclerotic inflammatory process in their major vessels compared to their age-matched controls with normal BMI. Future studies should assess the associated between these findings and the cardiovascular events in the long term. (authors)