Accumulation of glucose in keloids with FDG-PET.
OBJECTIVE
Glucose metabolism has not been investigated in human (in vivo) keloids. In the present study, we performed positron emission tomography (PET) with fluorine-18-fluorodeoxyglucose (FDG) to examine glucose metabolism in keloids.


METHODS
Five patients (2 men and 3 women) with typical keloids having a thickness of more than 5 mm were studied. HEADTOME-IV SET-1400W-10 (Shimadzu, Tokyo, Japan) was employed for PET studies. Transmission scanning was performed on each patient. After fasting for more than 4 hours, the patients were injected intravenously with FDG 185-370 (MBq) following each transmission scan. Emission scans were performed 40-55 min after injection. For quantitative evaluation, the regions of interest (Circles ROIs: 6 mm in diameter) were placed on all the keloid lesions and surrounding tissues, and then their standardized uptake value (SUV = the tissue concentration/the activity injected per body weight) was calculated.


RESULTS
FDG was defined as showing the accumulation in keloids when its uptake was relatively higher in the keloid than that in the surrounding tissue. The SUV of the keloids ranged from 1.0 to 2.74, with a mean of 1.79.


CONCLUSIONS
FDG-PET was performed in 5 patients with keloids and low-grade accumulation of FDG was observed in all lesions. This indicated that glucose metabolism was accelerated in keloids.
Ozawa
Toshiyuki
T
Department of Plastic and Reconstructive Surgery, Osaka City University, Graduate School of Medicine, Japan. ozawa@med.osaka-cu.ac.jp
Okamura
Terue
T
Harada
Teruichi
T
Muraoka
Michinari
M
Ozawa
Nozomi
N
Koyama
Koichi
K
Inoue
Yuichi
Y
Ishii
Masamitsu
M
D000328:Adult; D000368:Aged; D005260:Female; D019788:Fluorodeoxyglucose F18 / Q000493:pharmacokinetics*; D005947:Glucose / Q000378:metabolism*; D006801:Humans; D007627:Keloid / Q000000981:diagnostic imaging* / Q000378:metabolism*; D008297:Male; D049268:Positron-Emission Tomography / Q000379:methods*; D019275:Radiopharmaceuticals; D014018:Tissue Distribution
D019275:Radiopharmaceuticals; D019788:Fluorodeoxyglucose F18; D005947:Glucose