Conclusions and perspectives
As mentioned in the present review, in the last several years, it was shown that the receptors of regulatory peptides, and specifically of NPY-related peptides, are not only present in normal human tissue, but are also overexpressed in a large variety of human neoplasms [54], highlighting the diagnostic and therapeutical relevance of their evaluation. Neuropeptide receptors are potential targets for imaging and radiotherapy by radiolabeled peptide hormone analogues [55]. For example, the high level of expression of somatostatin receptors on various tumor cells has already provided the molecular basis for successful use of radiolabeled somatostatin analogues as tumor tracers in nuclear medicine [56]. Similarly, the evaluation of the NPY system with a similar aim may result of clinical utility [36, 44, 57]. In addition to radiolabeled analogues for peptides such as somatostatin, cholecystokinin (CCK), gastrin, bombesin, substance P, and vasoactive intestinal peptide (VIP), analogues for NPY-related peptides have also been introduced [58, 59]. NPY analogues for the Y1-Rs, which are overexpressed in prostate and breast cancer, are currently under development and in different phases of (pre) clinical investigation. Moreover, multireceptor tumor targeting using the combination of bombesin and NPY Y1-R analogues is promising for scintigraphy and peptide receptor radionuclide therapy of breast carcinomas and their lymph node metastases [60].
In conclusion, the current evidence indicates that the NPY-family of peptides may play an important role in the progression of neuroendocrine tumors, and breast and prostate cancer. Future studies will better clarify some aspects of the involvement of these neuropeptides in tumor biology, as well as indicate novel diagnostic markers and therapeutical approaches.
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Ruscica, M., Dozio, E., Motta, M., Magni, P. (2005). NPY family of peptides in endocrine, breast and prostate tumors. In: Zukowska, Z., Feuerstein, G.Z. (eds) The NPY Family of Peptides in Immune Disorders, Inflammation, Angiogenesis and Cancer. Progress in Inflammation Research. Birkhäuser Basel. https://doi.org/10.1007/3-7643-7427-6_15
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