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225Ac-ETN029

Phase 1

Small Cell Lung Carcinoma | Small molecule | Oncology |Novartis AG|Trials Updated: Sep 22, 2026

Development status

Highest phase Phase 1
Registered trials 1 across 1 sponsor since Jun 2025

Success Probability

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Market & Valuation

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Trial Design

UNCONTROLLED
Total Trials1
Total Enrollment116

FDA Designations

No designations recorded

Clinical trial landscape

225Ac-ETN029 · 1 trial · 11 indications

Phase 1 1
NCT07006727Phase I Study of [225Ac]Ac-ETN029 in Patients With Advanced DLL3-expressing Solid TumorsSmall Cell Lung Carcinoma
RECRUITING116 Analytics
PHASE1RECRUITING
Phase I Study of [225Ac]Ac-ETN029 in Patients With Advanced DLL3-expressing Solid Tumors
Small Cell Lung CarcinomaUnlock trial analytics

Study Endpoints

Primary Endpoints

Number of patients with dose limiting toxicities of 225Ac-ETN029
From the start of study treatment until 6 weeks after

A dose limiting toxicity (DLT) is defined as any adverse event or abnormal laboratory value of CTCAE 5.0 grade 3 or higher that occurs within the DLT evaluation period and that is not primarily related to disease, disease progression, intercurrent illness, or concomitant medications with a few exceptions defined in the study protocol. Other significant toxicities may be considered to be DLTs, even if not Grade 3 or higher.

Incidence and severity of adverse events and serious adverse events of 225Ac-ETN029
From start of study treatment until completion of the 36 month follow up, assessed up to approximately 42 months

Incidence and severity of treatment-emergent adverse events and serious adverse events, including changes in laboratory values, vital signs, and electrocardiograms qualifying and reported as AEs

Dose modifications for 225Ac-ETN029
From the start of study treatment until last dose of study treatment, assessed as approximately 24 weeks

Number of dose modifications (e.g, dose interruptions and reductions) for 225Ac-ETN029

Dose intensity for 225Ac-ETN029
From start of study treatment until last dose of study treatment, assessed as approximately 24 weeks

Dose intensity of 225Ac-ETN029 defined as the ratio of actual cumulative dose received and actual duration of exposure

Secondary Endpoints

Overall response rate (ORR)
Up to approximately 42 months
Disease control rate (DCR)
Up to approximately 42 months
Duration of response (DOR)
Up to approximately 42 months
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Study Design & Arms

AllocationNA
MaskingNONE
ModelSINGLE_GROUP
PurposeTREATMENT

Treatment Arms

ArmTypeDescription
Arm 1EXPERIMENTALPatients will receive 225Ac-ETN029, with some patients also receiving 111In-ETN029

Interventions

NameTypeDescription
225Ac-ETN029DRUGRadioligand therapy
111In-ETN029DRUGRadioligand imaging agent
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Eligibility Criteria

Age Range18 Years to 100 Years
SexALL
Healthy VolunteersNo
Study Sites8

Inclusion Criteria: * Age ≥ 18 years old * Patients with one of the following indications: Dose Escalation Only: * Locally advanced, unresectable, or metastatic SCLC with disease progression following, or intolerance to, at least 1 line of systemic therapy, including platinum-containing chemother...

Countries:United StatesCanadaJapanSouth Korea
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Recent Changes (Last 90 Days)

LOWSep 22, 2026NCT07006727Enrollment: 123 → 116
LOWSep 22, 2026NCT07006727Enrollment: 123 → 116
LOWSep 9, 2026NCT07006727Enrollment: 116 → 123
LOWSep 9, 2026NCT07006727Enrollment: 116 → 123
LOWJul 28, 2026NCT07006727lastUpdatePostDate: changed
LOWJul 28, 2026NCT07006727lastUpdatePostDate: changed

Frequently asked questions about 225Ac-ETN029

What is 225Ac-ETN029?

225Ac-ETN029 is an investigational oncology therapy being developed by Novartis AG for Small Cell Lung Carcinoma and other advanced DLL3-expressing solid tumors. It is a small molecule in Phase 1 clinical development and has not been approved by the FDA. It is administered as a targeted treatment for patients with these tumor types.

What is 225Ac-ETN029 used for?

225Ac-ETN029 is being studied for the treatment of Small Cell Lung Carcinoma and other advanced DLL3-expressing solid tumors. Its clinical program includes patients with large cell neuroendocrine carcinoma of the lung, neuroendocrine prostate cancer, gastroenteropancreatic neuroendocrine carcinoma, Merkel cell carcinoma, and medullary thyroid carcinoma, among other neuroendocrine tumor types.

Who is developing 225Ac-ETN029?

Novartis AG, which trades under the ticker NVS, is the developer of 225Ac-ETN029. The company is running the clinical program for this investigational small molecule in advanced DLL3-expressing solid tumors, including Small Cell Lung Carcinoma.

What phase is 225Ac-ETN029 in?

225Ac-ETN029 is in Phase 1 clinical development. It is an investigational therapy and is not FDA approved. The Phase 1 program is currently recruiting participants and is designed to evaluate the drug in patients with advanced DLL3-expressing solid tumors, including Small Cell Lung Carcinoma.

What clinical trials is 225Ac-ETN029 in?

225Ac-ETN029 is being evaluated in the Phase 1 study NCT07006727, titled a Phase I Study of [225Ac]Ac-ETN029 in Patients With Advanced DLL3-expressing Solid Tumors. The trial is recruiting and plans to enroll 116 participants across the United States, Canada, Japan, and South Korea. It is an uncontrolled study in adults 18 years and older.