Objective: Although 2-F-fluoro-2-deoxy-glucose (F-FDG) has established roles in the diagnosis of a variety of cancers, it has limited value in the detection of primary/recurrent lesions in the bladder, mainly because of interference by the pooled radioactivity in the urine. Our previous study revealed promising properties of L- and D-2-F-α-methyl-phenylalanine (2-F-FAMP) as radiotracers; i.e., their rapid blood clearance and low renal accumulation. In the present study we evaluated the utility of L- and D-2-F-FAMP for imaging bladder cancer in a mouse model.
Methods: We used the human bladder cancer cell line HT1376 to prepare a bladder cancer xenograft model in mice bearing both orthotopic and subcutaneous tumors. Biodistribution and PET imaging studies were performed at 1 and 3 h after injection of L-2-F-FAMP or D-2-F-FAMP. F-FDG was used as a control.
Results: At 1 h after injection, greater accumulations of both L-2-F-FAMP and D-2-F-FAMP were observed in the orthotopic tumors compared to F-FDG. The orthotopic tumor-to-muscle ratio of D-2-F-FAMP was significantly higher than that of F-FDG (p < 0.01), because of the rapid blood clearance of D-2-F-FAMP. L-2-F-FAMP showed the highest subcutaneous tumor-to-muscle ratio (p < 0.01) due to its high subcutaneous tumor uptake. Compared to L-2-F-FAMP, D-2-F-FAMP exhibited faster clearance and lower kidney accumulation. In the PET imaging studies, L- and D-2-F-FAMP both clearly visualized the orthotopic bladder tumors at 1 h after injection.
Conclusion: Our study showed that L-2-F-FAMP and D-2-F-FAMP have the potential to detect bladder cancer.
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