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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

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Trial Design

CONTROLLED
Total Trials1
Total Enrollment55

FDA Designations

No designations recorded

Clinical trial landscape

LNTH2403 Phase 1 dose · 1 trial · 1 indication

Phase 1 1
NCT07357519Lu-TARGO (177Lu-TARGeted Osteosarcoma Therapy)Relapsed / Refractory Osteosarcoma
RECRUITING55 Analytics
PHASE1RECRUITING
Lu-TARGO (177Lu-TARGeted Osteosarcoma Therapy)
Relapsed / Refractory OsteosarcomaUnlock trial analytics

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 to 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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Frequently asked questions about LNTH2403 Phase 1 dose

What is LNTH2403 used for?

LNTH2403 is an investigational small molecule being studied for the treatment of relapsed or refractory osteosarcoma, a type of bone cancer. It is currently in Phase 1 clinical development and has not been approved by the FDA.

Who is developing LNTH2403?

LNTH2403 is being developed by Lantheus Holdings, Inc., a company traded on the NASDAQ under the ticker symbol LNTH. The company is conducting a Phase 1 clinical trial to evaluate the drug in patients with relapsed or refractory osteosarcoma.

What phase is LNTH2403 in?

LNTH2403 is in Phase 1 clinical development. It is an investigational drug and has not been approved by the FDA. The ongoing Phase 1 trial is currently recruiting participants in the United States.

What clinical trials is LNTH2403 in?

LNTH2403 is being evaluated in a Phase 1 clinical trial with the identifier NCT07357519, titled Lu-TARGO (177Lu-TARGeted Osteosarcoma Therapy). The trial is recruiting patients with relapsed or refractory osteosarcoma in the United States and has an enrollment target of 55 participants.

Is LNTH2403 the same as Lu-TARGO?

LNTH2403 is associated with the clinical trial Lu-TARGO, which stands for 177Lu-TARGeted Osteosarcoma Therapy. The trial name refers to the study of LNTH2403 in patients with relapsed or refractory osteosarcoma.