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Role of Radiolabelled Small Molecules Binding to PSMA in Diagnosis and Therapy of Prostate Cancer

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Book cover PET/CT in Prostate Cancer

Abstract

PET/CT with choline tracers has been used in the past for staging and detection of recurrent disease, but shows a low sensitivity and specificity, especially in patients with low PSA levels [1–3]. Therefore, novel tracers with improved imaging characteristics are needed. In this aspect the prostate-specific membrane antigen (PSMA) is a promising target. PSMA is a type II transmembrane protein with glutamate-carboxypeptidase and folate hydrolase activity, which shows overexpression on prostatic cancer including advanced stage prostate carcinomas [4, 5] and a low expression in normal tissues. After ligand binding to PSMA, the ligand-PSMA complex is internalized (Fig. 6.1), resulting in an effective accumulation of the bound molecule in the tumor cells. Together with a fast clearance of the tracer out of the circulation, this results in a high image quality for diagnosis and a high local dose for therapeutic applications. Several studies report that PSMA expression levels increase according to the stage and grade of the tumor [5–7]. Therefore, a variety of PSMA-targeted radioligands for diagnosis and therapy have been developed [8–23]. This chapter concentrates on small molecules binding to PSMA.

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Correspondence to Uwe Haberkorn .

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Haberkorn, U., Eder, M., Kopka, K., Babich, J.W., Eisenhut, M. (2017). Role of Radiolabelled Small Molecules Binding to PSMA in Diagnosis and Therapy of Prostate Cancer. In: Cook, G. (eds) PET/CT in Prostate Cancer. Clinicians’ Guides to Radionuclide Hybrid Imaging(). Springer, Cham. https://doi.org/10.1007/978-3-319-57624-4_6

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  • DOI: https://doi.org/10.1007/978-3-319-57624-4_6

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