yttrium Y 90 resin microspheres

Definition / meaning of yttrium Y 90 resin microspheres

An injectable formulation of the radioisotope yttrium Y 90 encapsulated in resin microspheres with potential antineoplastic activity. When injected into arterial vasculature supplying the tumor, yttrium Y 90 resin microspheres occlude tumor blood vessels and selectively deliver a cytotoxic dose of beta emitting yttrium Y 90 to the tumor site, which may result in tumor cell death and tumor regression.

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Source(s):

The Web site of the National Cancer Institute (http://www.cancer.gov/)

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