JOURNAL ARTICLE
REVIEW
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Microsphere radioembolization of liver malignancies: current developments.

The worldwide incidence of hepatic malignancies, both primary and secondary, exceeds 1 000 000 new cases each year. The poor prognosis of patients suffering from hepatic malignancies has lead to the development of a liver directed therapy which consists of intra-arterial administration of radioactive particles through a catheter. Yttrium-90 ((90)Y) microspheres are increasingly applied for this purpose, and up to now nearly all clinical experience with radioembolization has been obtained with these microspheres. The response rate is very promising in both patients with primary and metastatic liver malignancies. Currently, two commercially available (90)Y microsphere devices are in use clinically, both as a first-line treatment and in a salvage setting. Unfortunately, the use of a pure beta-emitter like (90)Y hampers acquisition of high quality nuclear images for pre-treatment work-up and follow-up. This issue was addressed by the development of holmium-166 ((166)Ho) and rhenium-188 ((188)Re) microspheres, which emit both beta-particles for therapeutic purposes and gamma-photons for nuclear imaging. Moreover, since holmium is paramagnetic it allows for magnetic resonance imaging. (166)Ho loaded poly(L-lactic acid) microspheres have been thoroughly investigated in a preclinical setting, and recently the first clinical results for (188)Re microspheres were reported. This review provides an overview of the current status and (pre-)clinical developments of radioactive microspheres for treatment of liver malignancies.

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