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LNTH2403 Phase 1 dose

Phase 1

Relapsed / Refractory Osteosarcoma | Small molecule | Oncology |Lantheus Holdings, Inc.|Last Updated: May 1, 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
CONTROLLEDBiomarker
Total Trials1
Total Enrollment55
FDA Designations
No designations recorded
Clinical Trials (1)
NCT IDTitlePhaseStatusEnrollmentVelocityDesignStartCompletionLast UpdatedSitesCountries
NCT07357519Lu-TARGO (177Lu-TARGeted Osteosarcoma Therapy)PHASE1 RECRUITING 55Feb 3, 2026May 1, 2032May 1, 20262 United States
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Study Endpoints
Primary Endpoints
To identify the maximum tolerated dose (MTD) of LNTH-2403 in participants with R/R osteosarcoma (Ph1)
From enrollment to the end of treatment at 8 weeks

Incidence of DLTs during the first 8 weeks (DLT evaluation window) after the first dose of LNTH-2403

To evaluate the safety and tolerability profile of LNTH-2403 in participants with R/R osteosarcoma (Ph1)
From enrollment to the end of treatment at 8 weeks

Type, frequency, severity, timing, and relationship to LNTH-2403 of all Treatment-emergent adverse event, (TEAEs) and Serious adverse events, (SAEs)

To assess the preliminary anti-neoplastic activity of LNTH-2403 in participants with R/R osteosarcoma (Ph2)
From enrollment to Event-Free Survival (EFS) at 4 months

Event-Free Survival (EFS) at 4 months

Secondary Endpoints
To assess the preliminary anti-neoplastic activity of LNTH-2403 in participants with R/R osteosarcoma (Ph1)
8 weeks
To describe the safety and tolerability profile of LNTH-2403 in participants with R/R osteosarcoma (Ph2)
4 months
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Study Design & Arms
AllocationNON_RANDOMIZED
MaskingNONE
ModelSINGLE_GROUP
PurposeTREATMENT
Treatment Arms
ArmTypeDescription
Phase 1- Escalating doses of LNTH-2403 administered once every 8 weeksEXPERIMENTALPhase 1 will evaluate escalating doses of LNTH-2403 administered once every 8 weeks, with the potential to explore other dosing schedules based on observed radiation dosimetry and PK parameters and safety and tolerability data.
Phase 2 will evaluate LNTH-2403 as a single agent at the recommended phase 2 doseEXPERIMENTALPhase 2 will evaluate LNTH-2403 as a single agent in participants with R/R osteosarcoma at the recommended phase 2 dose (RP2D).
Interventions
NameTypeDescription
LNTH2403 Phase 1 doseDRUGLNTH-2403 administered once every 8 weeks, with the potential to explore other dosing schedules based on observed radiation dosimetry and PK parameters and safety and tolerability data.
Phase 2; LNTH2403 a single agent recommended phase 2 dose (RP2D).DRUGOnce the RP2D is selected, phase 2 will commence
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Eligibility Criteria
Age Range12 Years — N/A
SexALL
Healthy VolunteersNo
Study Sites2

Inclusion Criteria: Participants must meet all the following criteria to be enrolled in the study 1. Histopathologic documented diagnosis of R/R osteosarcoma 2. Must have disease characterized by at least one of the following (Participants meeting only (b.), only (c.), or only (b. and c.) must be d...

Countries:United States
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Recent Changes (Last 90 Days)
LOWMay 26, 2026NCT07357519primaryCompletionDate: changed
LOWMay 24, 2026NCT07357519studyFirstPostDate: changed