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Iopofosine I 131

Phase 1

Breast Cancer | Small molecule | Oncology |Cellectar Biosciences, Inc.|Last Updated: Jun 3, 2026

Success Probability
Approval Probability 71%
TA Base Rate26%
Adjusted LOA41%
ML RiskLOW_RISK
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Market & Valuation
rNPV $3.2B
Market Size $9.4B
Revenue Basis $1.6B
Competitors 6
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Trial Design
RandomizedCONTROLLEDDMCBiomarker
Total Trials1
Total Enrollment60
FDA Designations
No designations recorded
Clinical Trials (1)
NCT IDTitlePhaseStatusEnrollmentVelocityDesignStartCompletionLast UpdatedSitesCountries
NCT07311993Phase 1 Study of CLR 125 in Triple Negative Breast CancerPHASE1 RECRUITING 60Dec 5, 2025Jul 1, 2029Jun 3, 20264 United States
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Study Endpoints
Primary Endpoints
Dose Determination for CLR 125
57 days after initiation of last cycle (each cycle is 57 days)

Identify the recommended Phase 2 dose and regimen of CLR 125 in advanced TNBC patients

Number of adverse events related to study treatment (CLR 125)
Assessed throughout the study through 1 year following completion of treatment.

Adverse Events are graded per NCI CTCAE v5.0

Secondary Endpoints
Efficacy Evaluation for Overall Response Rate
57 days after initiation of last cycle (each cycle is 57 days)
Efficacy Evaluation for Progression Free Survival
Assessed throughout the study through 1 year following completion of treatment
Efficacy Evaluation for Overall Survival
Assessed throughout the study through 1 year following completion of treatment
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Study Design & Arms
AllocationRANDOMIZED
MaskingNONE
ModelPARALLEL
PurposeTREATMENT
Treatment Arms
ArmTypeDescription
Dosimetry PhaseOTHERIopofosine I 131 (CLR 131) will be administered at 10 mCi on day 1 for approximately 15 patients for imaging purposes.
Treatment Phase: CLR 125 Arm 1EXPERIMENTALCLR 125 administered at 65 mCi/m2 fractionated over four doses (day 1, 2, 8, and 9) in each 8-week cycle; patient will receive up to 4 cycles.
Treatment Phase: CLR 125 Arm 2EXPERIMENTALCLR 125 will be administered at 125 mCi/m2 fractionated over four doses (day 1, 2, 8, and 9) in each 8-week cycle; patient will receive up to 3 cycles.
Treatment Phase: CLR 125 Arm 3EXPERIMENTALCLR 125 will be administered at 190 mCi/m2 fractionated over four doses (day 1, 2, 8, and 9) in each 8-week cycle; patient will receive up to 2 cycles.
Interventions
NameTypeDescription
Iopofosine I 131DRUGInvestigational radiopharmaceutical product intended for IV administration.
CLR 125DRUGInvestigational radiopharmaceutical product intended for IV administration.
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Eligibility Criteria
Age Range18 Years — N/A
SexALL
Healthy VolunteersNo
Study Sites4

Inclusion Criteria: * Unequivocal TNBC histology \[ER and PR less than 10% each and HER-2 negative\]. * Patients that have progressed after at least one prior standard therapeutic regimen given alone or in combination (including, but not limited, to: chemotherapy, immunotherapy, sacituzumab govitec...

Countries:United States
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Competitive Landscape -Breast Cancer 408 trials
CompanyTickerTrialsLead PhaseDrugs
Merck & Co., Inc.MRK12PHASE3Pembrolizumab, Paclitaxel, Doxorubicin, Epirubicin, Cyclophosphamide
AstraZeneca PLCAZN47PHASE3Fulvestrant, Capivasertib, Trastuzumab Deruxtecan, Paclitaxel, Trastuzumab
Gilead Sciences, Inc.GILD13PHASE3Sacituzumab Govitecan-hziy, Eribulin, Capecitabine Product, Gemcitabine, Vinorelbine
Eli Lilly and CompanyLLY27PHASE3Abemaciclib, Standard Adjuvant Endocrine Therapy, Imlunestrant, Tamoxifen, Anastrozole
BioNTech SE Sponsored ADRBNTX7PHASE3DB-1303/BNT323, T-DM1, Capecitabine, Paclitaxel, Nab-paclitaxel
Novartis AG Sponsored ADRNVS30PHASE3Ribociclib, Alpelisib, Fulvestrant, Trastuzumab, Pertuzumab
Olema Pharmaceuticals, Inc.OLMA5PHASE3Palazestrant, Fulvestrant, Anastrozole, Letrozole, Exemestane
Pfizer Inc.PFE34PHASE3ARV-471, Fulvestrant, PF-07220060, letrozole, abemaciclib
BeOne Medicines Ltd. Sponsored ADRONC6PHASE3BGB-43395, Letrozole, Abemaciclib, Palbociclib, Ribociclib
Jazz Pharmaceuticals Public Limited CompanyJAZZ3PHASE3Zanidatamab, Trastuzumab, Eribulin, Vinorelbine, Gemcitabine
Celcuity Inc.CELC3PHASE3Gedatolisib, Palbociclib, Fulvestrant, Alpelisib, Arm A: Gedatolisib + Palbociclib + Fulvestrant
Relay Therapeutics, Inc.RLAY2PHASE3RLY-2608, Capivasertib, Fulvestrant, Palbociclib, Ribociclib
GSK plc Sponsored ADRGSK2PHASE3Niraparib
Greenwich LifeSciences, Inc.GLSI1PHASE3GLSI-100
Bristol-Myers Squibb CompanyBMY5PHASE2Iza-bren, Nab-paclitaxel, Paclitaxel, Capecitabine, Carboplatin
BriaCell Therapeutics CorpBCTX2PHASE3SV-BR-1-GM, Cyclophosphamide, Interferon infiltration of the inoculation site, Retifanlimab, Treatment of Physician's Choice
Incyte CorporationINCY4PHASE2Ruxolitinib, Capecitabine, Regorafenib, Pembrolizumab, Axatilimab
Natera, Inc.NTRA3PHASE2Discontinuation of the anti-HER2 maintenance therapy
Puma Biotechnology, Inc.PBYI3PHASE2Neratinib, Loperamide, Colesevelam, Alisertib, Endocrine therapy
Immutep Ltd Sponsored ADRIMMP1PHASE2eftilagimod alpha, Paclitaxel
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Recent Changes (Last 90 Days)
LOWJun 4, 2026NCT07311993lastUpdatePostDate: changed
LOWJun 4, 2026NCT07311993lastUpdatePostDate: changed
LOWJun 4, 2026NCT07311993lastUpdatePostDate: changed
LOWJun 4, 2026NCT07311993lastUpdatePostDate: changed
LOWJun 4, 2026NCT07311993lastUpdatePostDate: changed
LOWMay 26, 2026NCT07311993primaryCompletionDate: changed
LOWMay 24, 2026NCT07311993studyFirstPostDate: changed