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• W2000432684 abstract "Purpose: To prospectively assess molecular imaging of multiple myeloma (MM) by using the radiolabeled amino acid carbon 11 (11C) methionine and positron emission tomography (PET)/computed tomography (CT). Materials and Methods: The study was approved by the institutional local ethics committee and the national radiation protection authorities. All patients with MM and control patients gave written informed consent. Nineteen patients with MM (11 women, eight men; age range, 42–64 years) and 10 control patients with hyperparathyroidism without hematologic diseases (six women, four men; age range, 43–75 years) underwent PET/CT 20 minutes after injection of a mean of 1.0 GBq ± 0.2 (standard deviation) 11C-methionine. Presence and extent of CT-assessed tumor manifestations and 11C-methionine bone marrow (BM) uptake were determined on the basis of maximum standardized uptake value (SUVmax). BM imaging patterns, normal BM, and maximal lesion 11C-methionine uptake in patients with MM were compared with those in control patients. In two patients with MM, sulfur 35 (35S) methionine uptake in freshly isolated BM plasma cells was measured. Values for SUVmax of groups were compared by using the Mann-Whitney test on a per-patient basis. Results: 35S-methionine uptake of plasma cells was five- to sixfold higher than in normal BM cells. 11C-methionine BM uptake in control patients was homogeneous and low. All patients with MM except one with exclusively extramedullary myeloma had 11C-methionine–positive lesions. Maximal lesion and normal BM 11C-methionine mean SUVmax were 10.2 ± 3.5 and 4.3 ± 2.0, respectively, and thus were significantly higher than that of BM in the control group (mean, 1.8 ± 0.3; P < .001). Extramedullary MM was clearly visible in three patients (mean SUVmax, 7.2 ± 2.4). Additional 11C-methionine–positive lesions in normal cancellous bone were found in nearly all patients with MM. In pretreated patients with MM, a moderate fraction of osteolytic lesions had no 11C-methionine uptake. Conclusion: On the basis of increased methionine uptake in plasma cells, active MM can be imaged with 11C-methionine PET/CT. © RSNA, 2006" @default.
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• W2000432684 date "2007-02-01" @default.
• W2000432684 modified "2023-09-27" @default.
• W2000432684 title "Multiple Myeloma: Molecular Imaging with C-Methionine PET/CT—Initial Experience" @default.
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• W2000432684 doi "https://doi.org/10.1148/radiol.2422051980" @default.
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