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TheraSphere Yttrium-90 Glass Microspheres

Phase 3

Inoperable Hepatocellular Carcinoma | Small molecule | Oncology |Boston Scientific Corporation|Last Updated: Aug 12, 2026

Success Probability

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Market & Valuation

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Trial Design

RandomizedACTIVE_CONTROLLED
Total Trials1
Total Enrollment92

FDA Designations

No designations recorded

Clinical trial landscape

TheraSphere Yttrium-90 Glass Microspheres · 1 trial · 1 indication

Phase 3 1
NCT05016245MANDARIN (S6371)Inoperable Hepatocellular Carcinoma
COMPLETED92 Analytics
PHASE3COMPLETED
MANDARIN (S6371)
Inoperable Hepatocellular CarcinomaUnlock trial analytics

Study Endpoints

Primary Endpoints

Time to progression (TTP)
through study completion, an average of 18 months

Time to progression (TTP) Definition of progression: Progressive Disease (PD) assessment occurs according to mRECIST occurs according to mRECIST

Safety assessed within 60 days post treatment using NCI-CTCAE v5.0
within 60 days post treatment

Secondary Endpoints

Hepatic time to progression (hTTP) determined by localized mRECIST (within the treated area)
through study completion, an average of 18 months
Objective response rate (ORR) of the index lesion according to localized mRECIST (within the treatment area)
through study completion, an average of 18 months
Confirmed ORR according to mRECIST
through study completion, an average of 18 months
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Study Design & Arms

AllocationRANDOMIZED
MaskingNONE
ModelPARALLEL
PurposeTREATMENT

Treatment Arms

ArmTypeDescription
TheraSphere™ Yttrium-90 Glass MicrospheresEXPERIMENTAL -
conventional Transarterial Chemoembolization(cTACE)ACTIVE_COMPARATOR -

Interventions

NameTypeDescription
TheraSphere™ Yttrium-90 Glass MicrospheresCOMBINATION_PRODUCTTheraSphere™ Yttrium-90 Glass Microspheres TheraSphere™ is steam sterilized and supplied in 6 standard dose sizes: 3 GBq, 5 GBq, 7 GBq, 10 GBq, 15 GBq, 20 GBq. Custom dose sizes are also available in 0.5 GBq increments between 3 and 20 GBq. TheraSphereTM is supplied with the following accessories: Administration Set Administration Accessory Kit
conventional Transarterial Chemoembolization(cTACE)PROCEDUREconventional Transarterial Chemoembolization(cTACE) is comprised of an anti-neoplastic agent(s) (i.e. cisplatin), lipiodol and embolic agent(s). The choice of agent(s) to be used is per usual local site practice. Chemotherapy agents can be as a single agent or used in combination, as per local practice.
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Eligibility Criteria

Age Range18 Years to 80 Years
SexALL
Healthy VolunteersNo
Study Sites1

Inclusion Criteria: * ≥18 and ≤80 age and provided study consent * Patients diagnosed with HCC and clinically evaluated as inoperable (as per local practice) or who refuse operation (ablation, hepatectomy and liver transplantation) * At least one well defined HCC tumor measurable by mRECIST in cont...

Countries:China
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Recent Changes (Last 90 Days)

HIGHAug 12, 2026NCT05016245Status: ACTIVE_NOT_RECRUITING → COMPLETED
HIGHAug 12, 2026NCT05016245Status: ACTIVE_NOT_RECRUITING → COMPLETED
LOWJul 14, 2026NCT05016245lastUpdatePostDate: changed
LOWJul 14, 2026NCT05016245lastUpdatePostDate: changed
LOWJun 8, 2026NCT05016245lastUpdatePostDate: changed
LOWJun 8, 2026NCT05016245lastUpdatePostDate: changed
LOWJun 8, 2026NCT05016245lastUpdatePostDate: changed

Frequently asked questions about TheraSphere Yttrium-90 Glass Microspheres

What is TheraSphere Yttrium-90 Glass Microspheres used for?

TheraSphere Yttrium-90 Glass Microspheres is used for inoperable hepatocellular carcinoma, a type of liver cancer. It is an investigational therapy being developed by Boston Scientific Corporation. The treatment involves delivering radioactive microspheres directly to the tumor, and it is currently in Phase 3 clinical development.

What does TheraSphere Yttrium-90 Glass Microspheres target?

TheraSphere Yttrium-90 Glass Microspheres targets liver tumors by delivering yttrium-90, a radioactive isotope, directly to the site of the cancer. The microspheres are injected into the hepatic artery, where they become lodged in the tumor's blood vessels and emit radiation to destroy cancer cells while sparing healthy tissue.

Who makes TheraSphere Yttrium-90 Glass Microspheres?

TheraSphere Yttrium-90 Glass Microspheres is developed by Boston Scientific Corporation, a medical device company traded on the New York Stock Exchange under the ticker BSX. The company is conducting clinical trials to evaluate the treatment for inoperable hepatocellular carcinoma.

What phase is TheraSphere Yttrium-90 Glass Microspheres in?

TheraSphere Yttrium-90 Glass Microspheres is in Phase 3 clinical development. It is an investigational therapy and has not been approved by regulatory authorities. A Phase 3 trial, known as MANDARIN (NCT05016245), has been completed, evaluating the treatment in patients with inoperable hepatocellular carcinoma.

What clinical trials is TheraSphere Yttrium-90 Glass Microspheres in?

TheraSphere Yttrium-90 Glass Microspheres has one completed Phase 3 clinical trial, MANDARIN (NCT05016245). This randomized, active-controlled study enrolled 92 patients with inoperable hepatocellular carcinoma in China. The trial was open to adults aged 18 years and older, and it did not use a biomarker for patient selection.

Is TheraSphere Yttrium-90 Glass Microspheres the same as SIR-Spheres?

No, TheraSphere Yttrium-90 Glass Microspheres is not the same as SIR-Spheres. While both are yttrium-90 microsphere therapies used for liver cancer, they are distinct products. TheraSphere is developed by Boston Scientific, whereas SIR-Spheres is a different product from another manufacturer. The two are not interchangeable.