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Internal view of patient's torso demonstrating targeted accuracy of TheraSphere Y-90 Glass Microspheres in liver.

TheraSphere™ Y-90 Glass Microspheres

PROACTIF study

PROACTIF study overview

The largest prospective, real-world Y-90 study with TheraSphere for the treatment of liver malignancies

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1,259 total patient population

(HCC, ICC, mCRC)

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34 sites

All-comers over 5 years


Study objectives

Evaluate effectiveness, safety and patient quality of life (QoL) with TheraSphere treatment in real-world clinical practice, and to identify clinical and dosimetric factors associated with survival

Primary endpoints

Overall survival (OS) and quality of life (QoL)

Key secondary endpoints

Safety, conversion to surgery and factors associated with OS


This study was sponsored by Boston Scientific Corporation. Lead investigators: Etienne Garin, MD and Boris Guiu, MD.

Guiu B, Bailly C, Vibert E et al. Effectiveness and safety of selective internal radiation therapy using yttrium-90 glass microspheres for hepatocellular carcinoma: real-world results from the multi-center prospective PROACTIF cohort of 989 patients. eClinicalMedicine, 2026; 95.