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I-131-1095

Phase 2

Metastatic Prostate Cancer | Small molecule | Oncology |Lantheus Holdings, Inc.|Last Updated: Oct 14, 2025

Success Probability

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Market & Valuation

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Trial Design

RandomizedACTIVE_CONTROLLEDDMC
Total Trials1
Total Enrollment120

FDA Designations

No designations recorded

Clinical trial landscape

I-131-1095 · 1 trial · 5 indications

Phase 2 1
NCT03939689I-131-1095 Radioligand Plus Enzalutamide vs Enzalutamide for mCRPC That Progressed During Abiraterone (ARROW).Metastatic Prostate Cancer
COMPLETED120 Analytics
PHASE2COMPLETED
I-131-1095 Radioligand Plus Enzalutamide vs Enzalutamide for mCRPC That Progressed During Abiraterone (ARROW).
Metastatic Prostate CancerUnlock trial analytics

Study Endpoints

Primary Endpoints

PSA Response Rate
Up to 53 weeks

The percentage of participants with a PSA response according to PCWG3 criteria. PCWG3 defines PSA response as the first occurrence of a 50 percent or more decline in PSA from baseline, confirmed by a second measurement at least 3 weeks later.

Secondary Endpoints

Objective Response Rate (ORR)
Up to 53 weeks
Radiographic Progression Free Survival (rPFS)
Up to 5 years.
Overall Survival (OS)
Up to 5 years
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Study Design & Arms

AllocationRANDOMIZED
MaskingNONE
ModelPARALLEL
PurposeTREATMENT

Treatment Arms

ArmTypeDescription
EnzalutamideACTIVE_COMPARATORParticipants received the label dosage of enzalutamide once daily for up to 53 weeks.
I-131-1095 in combination with enzalutamideEXPERIMENTALParticipants received up to 4 (8-week) cycles of I-131-1095: 100 mCi for the first dose. Subsequent dose(s) were reduced to 75 mCi for participants experiencing any of the dose-limiting toxicities. The third and fourth therapeutic doses could be reduced to 75 mCi on the basis of dosimetry assessment after administration of 10 mCi of I-131-1095 prior to the third dosing cycle. Participants also received the label dosage of enzalutamide once daily for up to 53 weeks.

Interventions

NameTypeDescription
I-131-1095DRUGParticipants received up to 4 (8-week) cycles of I-131-1095: 100 mCi for the first dose. Subsequent dose(s) were reduced to 75 mCi for participants experiencing any dose-limiting toxicities. The third and fourth therapeutic doses could be reduced to 75 mCi on the basis of dosimetry assessment after administration of 10 mCi of I-131-1095 prior to the third dosing cycle. Participants also received the label dosage of enzalutamide once daily for up to 53 weeks.
EnzalutamideDRUGParticipants received the label dosage of enzalutamide once daily for up to 53 weeks.
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Eligibility Criteria

Age Range18 Years to N/A
SexMALE
Healthy VolunteersNo
Study Sites27

Inclusion Criteria: 1. Male ≥ 18 years of age 2. Histologically or cytologically confirmed adenocarcinoma of the prostate without neuroendocrine differentiation or small cell features at initial diagnosis 3. Castration-resistant prostate cancer, with serum testosterone ≤ 50 ng/dL at Screening 4. Ra...

Countries:United StatesCanada
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Competitive Landscape -Prostate Cancer 254 trials (matched to "Metastatic Prostate Cancer")

Frequently asked questions about I-131-1095

What is I-131-1095 used for in metastatic prostate cancer?

I-131-1095 is an investigational small molecule being studied for the treatment of metastatic prostate cancer, specifically metastatic castration-resistant prostate cancer (mCRPC) that has progressed during treatment with abiraterone. It is being evaluated in combination with enzalutamide in a Phase 2 clinical trial.

What does I-131-1095 target?

I-131-1095 is a radioligand therapy, meaning it delivers a radioactive isotope (I-131) to cancer cells. The specific molecular target of I-131-1095 has not been disclosed in the available information, so its precise mechanism of action is not detailed here.

Who makes I-131-1095?

I-131-1095 is being developed by Lantheus Holdings, Inc., a biopharmaceutical company traded on the NASDAQ under the ticker symbol LNTH. The company is conducting clinical research on this investigational agent for metastatic prostate cancer.

What phase is I-131-1095 in?

I-131-1095 is in Phase 2 clinical development. It is an investigational drug and has not been approved by the FDA. A Phase 2 trial has been completed, evaluating the drug in combination with enzalutamide for metastatic castration-resistant prostate cancer.

What clinical trials is I-131-1095 in?

I-131-1095 has been studied in one completed Phase 2 clinical trial, identified as NCT03939689. This trial, known as ARROW, compared I-131-1095 plus enzalutamide versus enzalutamide alone in patients with metastatic castration-resistant prostate cancer that progressed during abiraterone treatment. The trial enrolled 120 participants in the United States and Canada.

Is I-131-1095 the same as any other drug?

I-131-1095 is an investigational radioligand therapy developed by Lantheus Holdings. No alternative names for this drug have been disclosed in the available information. It is distinct from other prostate cancer therapies such as enzalutamide and abiraterone, which are used as comparators or combination partners in its clinical trial.