Current status of transarterial radioembolization

Table 1 Characteristics of commercially available ⁹⁰Y-particles

Feature	SIR-Spheres®	TheraSphere®
Isotope	90Y	90Y
Half life (h)	64.2	64.2
Material	Resin	Glass
Diameter (μm)	20-60	20-30
Activity per particle (Bq)	50	2500
Spheres per 3 GBq	40-80 × 106	1.2 × 106
Specific Gravity (g/mL)	1.6	3.2
Embolic effect	Mild	Negligible
Contrast injection	During infusion	No
FDA approved indication	CRC liver metastases with intrahepatic floxuridine	HCC

FDA: Food and Drug Administration; CRC: Colorectal cancer; HCC: Hepatocellular carcinoma.