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The skeleton is one of the preferential sites for metastases of solid tumors, and metastatic disease is the most common malignancy of the bone. Diagnosis and evaluation of skeletal metastases require more frequently a combined approach of different diagnostic methods. Between the currently available imaging modalities, a major role is devoted to two radionuclide functional techniques namely scintigraphy and positron emission tomography (PET) imaging. Both these techniques require the use of different radiopharmaceuticals. The aim of this paper is to review the most important radiocompounds that can be successfully used to detect and/or characterize bone metastases.

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Choline is a quaternary ammonium base that represents an essential component of phospholipids and cell membranes. Malignant transformation is associated with an abnormal choline metabolism at a higher levels with respect to those exclusively due to cell multiplication. The use of Positron Emission Tomography/Computed Tomography (PET/CT) with radiocholine (RCH), labeled with C or F, is widely diffuse in oncology, with main reference to restaging of patients with prostate cancer. The enhanced concentration in neoplasm is based not only on the increasing growing rate, but also on more specific issues, such as the augmented uptake in malignant cells due to the up-regulation of choline kinase. Furthermore the role of hypoxia in decreasing choline's uptake determine an in vivo concentration only in well oxygenated tumors, with a lower uptake when malignancy increases, that is, in tumors positive at F-Fluoro-deoxyglucose. In this paper we have analyzed the most important issues related to the possible utilization of RCH in diagnostic imaging of human cancer. J. Cell. Physiol. 232: 270-275, 2017. © 2016 Wiley Periodicals, Inc.

Positron Emission Tomography (PET) is a diagnostic imaging procedure used regularly to acquire essential clinical information. The PET-CT hybrid, which consists of two scanning machines: PET scanner and an x-ray Computed Tomography (CT). At present these represent the technological hierarchy of Nuclear Medicine, occupying an important position in diagnostics. In fact, PET-CT has the capability to evaluate diseases through a simultaneous functional and morphostructural analysis. This allows for an earlier diagnosis of the disease state which is crucial for obtaining the required information to provide a more reliable prognosis and therapy. Presently, the most frequently used PET radiotracer [ 18 F]fluorodeoxyglucose (FDG) has a major role in oncology. Useful information is being regularly obtained by using both FDG and a selection of radiotracer compounds to evaluate some of the most important biological processes. Thus, creating an opening for 'Molecular Imaging' and providing a platform for a potential revolution in the clinical diagnostic field. In this review, we hope to present the most interesting technicalogical and methodological advances in clinical diagnostics for oncology, neurology, and cardiology. A particular attention is dedicated to the applications of PET in neuropsychiatric diseases and its connections with receptor imaging.

Targeted alpha therapy (TAT) is an investigational procedure which utilises monoclonal antibodies (mAbs), peptide conjugates and/or other chemical compounds. These bio-vectors are able to transport a dose of alpha particles to destroy cancer cells. Radionuclide antibody-conjugates (RACs), labelled with beta emitters, have already been used in humans. More recently, TAT has been introduced to treat oncological diseases mainly leukaemia and lymphoma. Encouraging results have also been obtained in solid neoplasms with the administration of anti-tenascin. This chimeric antibody labelled with astatine-211 was delivered in patients with recurrent brain tumours into a surgically created cavity. Conversely, a clinical trial using a standard TAT approach to treat patients with metastatic melanoma, observed the shrinkage of the solid tumour mass. This response in melanoma may lead to an alternative mechanism for TAT, called tumour-antivascular- alpha-therapy (TAVAT), and forms the basis of a novel approach to the treatment of cancer disease states. In this paper, we will concentrate mainly on the application of TAT using antibodies. In particular, an investigation into the major general features connected with the use of alpha emitters in cancer therapy will be discussed. The prospective role of TAT with RACs will also be outlined briefly, especially focussing on the most important therapeutic strategies to date based on antibodies radiolabelled with beta emitters.

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