title: Detection of hepatocellular carcinoma using 11C-choline PET: comparison with 18F-FDG PET.
abstract: The purpose of this study was to retrospectively investigate the feasibility of 11C-choline PET, compared with 18F-FDG PET, for the detection of hepatocellular carcinoma (HCC).
  
  
  METHODS
  A total of 16 HCC lesions in 12 patients were examined with both 11C-choline PET and 18F-FDG PET. Tumor lesions were identified as areas of focally increased uptake, exceeding that of surrounding noncancerous liver tissue. For semiquantitative analysis, the tumor-to-liver (T/L) ratio was calculated by dividing the maximal standardized uptake value (SUV) in HCC lesions by the mean SUV in noncancerous liver tissue.
  
  
  RESULTS
  11C-choline PET showed a slightly higher detection rate than did 18F-FDG PET for detection of HCC (63% vs. 50%, respectively), although this difference was not statistically significant. 11C-choline PET had a better detection rate for moderately differentiated HCC lesions but not for those poorly differentiated (75% vs. 25%, respectively). In contrast, 18F-FDG PET exhibited the opposite behavior, with corresponding detection rates of 42% and 75%, respectively. The mean 11C-choline SUV and T/L ratio in moderately differentiated HCC lesions were higher than those in poorly differentiated HCC lesions. In contrast, the mean 18F-FDG SUV and T/L ratio in poorly differentiated HCC were higher than those in moderately differentiated HCC. These differences, however, were also not statistically significant.
  
  
  CONCLUSIONS
  11C-choline PET had a better detection rate for moderately differentiated HCC lesions but not for poorly differentiated HCC lesions, whereas 18F-FDG PET produced the opposite result. 11C-choline is a potential tracer to complement 18F-FDG in detection of HCC lesions.
authors.affiliation: Department of Radiology, Faculty of Medicine, Kagawa University, Kagawa, Japan. yuka@kms.ac.jp
authors.forename: Yuka
authors.initials: Y
authors.lastname: Yamamoto
authors.forename: Yoshihiro
authors.initials: Y
authors.lastname: Nishiyama
authors.forename: Reiko
authors.initials: R
authors.lastname: Kameyama
authors.forename: Keiichi
authors.initials: K
authors.lastname: Okano
authors.forename: Hirotaka
authors.initials: H
authors.lastname: Kashiwagi
authors.forename: Akihiro
authors.initials: A
authors.lastname: Deguchi
authors.forename: Masato
authors.initials: M
authors.lastname: Kaji
authors.forename: Motoomi
authors.initials: M
authors.lastname: Ohkawa
mesh_terms: D000368:Aged; D002250:Carbon Radioisotopes; D006528:Carcinoma, Hepatocellular / Q000000981:diagnostic imaging* / Q000378:metabolism; D002794:Choline / Q000493:pharmacokinetics; D005240:Feasibility Studies; D005260:Female; D019788:Fluorodeoxyglucose F18 / Q000493:pharmacokinetics; D006801:Humans; D008113:Liver Neoplasms / Q000000981:diagnostic imaging* / Q000378:metabolism; D008297:Male; D008875:Middle Aged; D049268:Positron-Emission Tomography; D019275:Radiopharmaceuticals / Q000493:pharmacokinetics; D012189:Retrospective Studies
chemical_list: D002250:Carbon Radioisotopes; D019275:Radiopharmaceuticals; D019788:Fluorodeoxyglucose F18; D002794:Choline