Yttrium Y 90 Carbon Microspheres

**Semantic type:** Pharmacologic Substance

**Definition:** An injectable formulation composed of carbon microspheres loaded with the radioisotope yttrium Y 90, with potential antineoplastic activity. Upon administration, the yttrium Y 90 carbon microspheres selectively deliver a cytotoxic dose of beta-emitting yttrium Y 90 to the tumor site, which may result in both tumor cell death and tumor regression.

**Synonyms:** - Yttrium-90 Carbon Microspheres