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Iopofosine I 131 single dose

Phase 2

Waldenstrom Macroglobulinemia | Small molecule | Oncology |Cellectar Biosciences, Inc.|Last Updated: Mar 18, 2026

Target and mechanism

ModalitySmall molecule

Also known as Iopofosine I 131

Success Probability

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Market & Valuation

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Trial Design

CONTROLLED
Total Trials1
Total Enrollment120

FDA Designations

ACCELERATED_APPROVALORPHAN_DRUGRARE_PEDIATRIC_DISEASEFAST_TRACKBREAKTHROUGH_THERAPY

Clinical trial landscape

Iopofosine I 131 single dose · 1 trial · 9 indications

Phase 2 1
NCT02952508Study of Iopofosine I-131 (CLR 131) in Select B-Cell Malignancies (CLOVER-1) With Expansion in WaldenstromWaldenstrom Macroglobulinemia
ACTIVE NOT_RECRUITING120 Analytics
PHASE2ACTIVE NOT_RECRUITING
Study of Iopofosine I-131 (CLR 131) in Select B-Cell Malignancies (CLOVER-1) With Expansion in Waldenstrom
Waldenstrom MacroglobulinemiaUnlock trial analytics

Study Endpoints

Primary Endpoints

Part A [CLOVER-1] Clinical benefit rate
84 days

Response assessment per International Uniform Response Criteria for Multiple Myeloma; Lugano Criteria for lymphoma; International Workshop on Chronic Lymphocytic Leukemia for CLL; VIth Waldenstrom's Macroglobulinemia Criteria for Response Assessment; or 2005 Response Criteria for CNS Lymphoma

Part B [CLOVER-WaM] Major Response Rate
12 months

Response assessment per criteria modified from VIth Waldenstrom's Macroglobulinemia Criteria for Response Assessment

Secondary Endpoints

Part A [CLOVER-1] Overall Response Rate
135 days
Part A [CLOVER-1] Progression Free Survival
135 days
Part A [CLOVER-1] Time to Next Treatment
3 years
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Study Design & Arms

AllocationNON_RANDOMIZED
MaskingNONE
ModelPARALLEL
PurposeTREATMENT

Treatment Arms

ArmTypeDescription
Iopofosine I 131, intravenous administration WMEXPERIMENTALIopofosine I 131 in Waldenstroms Macroglobulinemia
Iopofosine I 131, intravenous administration MMEXPERIMENTALIopofosine I 131 in Multiple Myeloma
Iopofosine I 131, intravenous administration CNS LymphomaEXPERIMENTALIopofosine I 131 in Central Nervous System Lymphoma
Iopofosine I 131 intravenous administration NHL [CLOSED]EXPERIMENTALIopofosine I 131 in Chronic Lymphocytic Leukemia / Small Lymphocytic Lymphoma, Mantle Cell Lymphoma, Marginal Zone Lymphoma, and Diffuse Large B-Cell Lymphoma

Interventions

NameTypeDescription
Iopofosine I 131 single doseDRUGRadiopharmaceutical
Iopofosine I 131 multiple doseDRUGRadiopharmaceutical
Iopofosine I 131 fractionated doseDRUGRadiopharmaceutical
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Eligibility Criteria

Age Range18 Years to N/A
SexALL
Healthy VolunteersNo
Study Sites52

\[CLOVER-1\] Inclusion Criteria: All Patients * Histologically or cytologically confirmed MM; Patients with primary or secondary CNSL may be enrolled. * ECOG performance status of 0 to 2 * 18 years of age or older * Life expectancy of at least 6 months * Platelets ≥ 75,000/µL (if full-dose anticoag...

Countries:United StatesAustraliaBrazilCzechiaFinlandFranceGreeceIsraelSpainTurkey (Türkiye)United Kingdom
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Frequently asked questions about Iopofosine I 131 single dose

What is Iopofosine I 131 used for?

Iopofosine I 131 is an investigational small molecule being developed for oncology indications, including Waldenstrom macroglobulinaemia (also spelled Waldenstrom macroglobulinemia) and breast cancer. It is currently in clinical development for these conditions, with trials evaluating its use in B-cell malignancies and triple negative breast cancer.

Who makes Iopofosine I 131?

Iopofosine I 131 is being developed by Cellectar Biosciences, Inc., a biopharmaceutical company traded on the NASDAQ under the ticker symbol CLRB. The company is conducting clinical trials to evaluate the drug's safety and efficacy in various oncology indications.

What phase is Iopofosine I 131 in?

Iopofosine I 131 is in clinical development across multiple phases. A Phase 1 study is recruiting for triple negative breast cancer, a Phase 2 study (CLOVER-1) is active but not recruiting for B-cell malignancies, and a Phase 3 study is not yet recruiting for Waldenstrom macroglobulinaemia. The drug is investigational and not yet approved.

What clinical trials is Iopofosine I 131 in?

Iopofosine I 131 is being evaluated in several trials. NCT02952508 is a Phase 2 study in select B-cell malignancies with expansion in Waldenstrom macroglobulinemia. NCT07311993 is a Phase 1 study in triple negative breast cancer. NCT07766421 is a Phase 3 study comparing Iopofosine I 131 to R-CD in Waldenstrom macroglobulinaemia patients.

Is Iopofosine I 131 the same as CLR 125?

No, Iopofosine I 131 is not the same as CLR 125. Iopofosine I 131 is being studied in B-cell malignancies and Waldenstrom macroglobulinaemia, while CLR 125 is a separate investigational drug being evaluated in a Phase 1 study for triple negative breast cancer (NCT07311993). Both are developed by Cellectar Biosciences.

What FDA designations has Iopofosine I 131 received?

Iopofosine I 131 has received several FDA designations, including accelerated approval, orphan drug, rare pediatric disease, fast track, and breakthrough therapy. These designations are intended to expedite the development and review of the drug for serious or life-threatening conditions.