title: Uptake of carbon-11-methionine and fluorodeoxyglucose in non-Hodgkin's lymphoma: a PET study.
abstract: Uptake of L-[methyl-11C]methionine (11C-methionine) and [18F]-2-fluoro-2-deoxy-D-glucose (FDG) was studied with PET in 14 patients with non-Hodgkin's lymphomas. The low molecular weight fraction of venous plasma separated by fast gel filtration was used as the input function for 11C-methionine studies, and tracer accumulation was analyzed according to Patlak and Gjedde. The average uptake rate of 11C-methionine was 0.0775 +/- 0.0245 min-1 (s.d.) and of FDG 0.0355 +/- 0.0293 min-1, 11C-methionine uptake rate being significantly higher than that of FDG (p less than 0.01). Carbon-11-methionine accumulated strongly in all but one of the lymphomas. FDG accumulated clearly in lymphomas of high-grade malignancy, whereas two intermediate- and three low-grade malignant lymphomas had a poor uptake rate. The tumor/plasma ratio of both 11C-methionine and FDG increased faster in high and intermediate-grade lymphomas than in low-grade lymphomas, but there was considerable overlap between the histologic grades. Carbon-11-methionine seems to be preferable in detecting tumors, while FDG was superior to 11C-methionine in distinguishing the high-grade malignant lymphomas from the other grades.
authors.affiliation: Department of Oncology and Radiotherapy, Turku University Central Hospital, Finland.
authors.forename: S
authors.initials: S
authors.lastname: Leskinen-Kallio
authors.forename: U
authors.initials: U
authors.lastname: Ruotsalainen
authors.forename: K
authors.initials: K
authors.lastname: Någren
authors.forename: M
authors.initials: M
authors.lastname: Teräs
authors.forename: H
authors.initials: H
authors.lastname: Joensuu
mesh_terms: D000328:Adult; D000368:Aged; D002250:Carbon Radioisotopes; D003847:Deoxyglucose / Q000031:analogs & derivatives* / Q000493:pharmacokinetics; D005260:Female; D005462:Fluorine Radioisotopes; D019788:Fluorodeoxyglucose F18; D006801:Humans; D008228:Lymphoma, Non-Hodgkin / Q000097:blood / Q000378:metabolism*; D008297:Male; D008715:Methionine / Q000493:pharmacokinetics*; D008875:Middle Aged; D014055:Tomography, Emission-Computed
chemical_list: D002250:Carbon Radioisotopes; D005462:Fluorine Radioisotopes; D019788:Fluorodeoxyglucose F18; D003847:Deoxyglucose; D008715:Methionine