DAREON ® -Lung-1: A Study in People With Advanced Small Cell Lung Cancer to Compare Obrixtamig Plus Atezolizumab, Carboplatin, and Etoposide Treatment With Standard Chemoimmunotherapy

What this study involves

The registry says this study is recruiting. Individual locations may have different availability.

Study type

Interventional

Phase

Phase 3

Age range

18 years - Not specified

Sex eligible

All sexes

Healthy volunteers

Not accepted

Participants

670 Estimated

These are starting points, not an eligibility decision. The research team must review the full requirements.

About the research

This study is open to adults with advanced small cell lung cancer (SCLC). The purpose of this study is to find out if a study medicine called obrixtamig plus standard treatment (atezolizumab, carboplatin, and etoposide) improves survival when compared to standard treatment alone. Obrixtamig is an antibody-like molecule that may help the immune system fight cancer. Another purpose of the study is to test a medical device being developed to measure levels of the tumour marker DLL3.

Participants are put into 2 groups randomly, which means by chance. One group receives obrixtamig and standard treatment. The other group receives standard treatment without obrixtamig. All treatments are given as infusions into a vein.

Participants are in the study for up to 3 years. During this time, they visit the study site regularly. Participants in the group receiving obrixtamig stay overnight at the study site following the first 2 obrixtamig treatments. At the visits, doctors check the size of the tumour(s). The results are compared between the 2 groups to see whether the treatment works. The doctors also regularly check participants' health and take note of any unwanted effects.

Who may be able to participate?

The list below is the sponsor’s full registry wording. It can include conditions, prior treatment, test results and other requirements. A match in search does not mean you qualify.

Inclusion Criteria :

1. Patients with histologically confirmed Extensive-stage Small Cell Lung Cancer (ES-SCLC)
2. Patients without any previous systemic anti-cancer treatment for ES-SCLC. Patients who received previous systemic anti-cancer treatment during limited stage are eligible if the treatment has been completed more than 6 months before the diagnosis of ES-SCLC.
3. Adequate archival formalin-fixed paraffin-embedded (FFPE) tumour tissue, as specified in the Laboratory Manual, must be available for central laboratory analysis of Delta-like ligand 3 (DLL3) expression status and other biomarkers. The central laboratory investigational VENTANA DLL3 (SP347) RxDx test result must be available prior to randomisation.
4. Patients with asymptomatic brain metastasis are eligible if they meet one of the following criteria:

* Treatment for brain metastases (e.g. whole brain radiation therapy, stereotactic radiotherapy, or radiosurgery) completed at least 7 days prior to randomisation and the patient is neurologically stable without the use of glucocorticoids or therapeutic anti-convulsant for at least 7 days prior to randomisation
* Untreated brain metastases that do not require treatment and the patient is neurologically stable without the use of glucocorticoids or therapeutic anti-convulsant for at least 28 days prior to randomisation
5. Eastern Cooperative Oncology Group (ECOG) score of 0 or 1
6. Eligible for continuing carboplatin + etoposide + atezolizumab regimen as first-line Standard of care (SoC) treatment within 28 days after the start of the initial cycle of standard therapy
7. Eligible to receive treatment with full dose of atezolizumab, carboplatin, and etoposide as first-line SoC treatment, in accordance with the approved Summary of Product Characteristics if provided centrally or approved local product label if provided by the trial site Further inclusion criteria apply.

Exclusion Criteria :

1. Presence of leptomeningeal disease and/or carcinomatous meningitis
2. Previous treatment targeting DLL3 (e.g. T cell engagers (TcEs), cell therapies, antibody-drug conjugates, or radiopharmaceuticals)
3. Radiotherapy of any anatomical site within 7 days prior to randomisation
4. Toxicity from previous treatments that has not resolved to ≤ Common Terminology Criteria for Adverse Events (CTCAE) Grade 1 or baseline. Patients with alopecia, any grade, CTCAE ≤Grade 2, asthenia/fatigue, amenorrhea/menstrual disorders any grade, CTCAE Grade ≤2 peripheral neuropathy, and/or CTCAE Grade 2 endocrinopathies controlled by replacement therapy, and toxicities, which are considered irreversible but stable for at least 4 weeks prior to randomisation, per investigator judgment may be eligible. Note: Patients who developed toxicity from the cycle of standard therapy received prior to randomisation are eligible if adequate organ function is ensured as described
5. Patient with active autoimmune disease or a documented history of autoimmune disease that requires systemic treatment (e.g. glucocorticoids or immunosuppressive drugs). Patients with vitiligo, resolved childhood asthma/atopy, alopecia, or any chronic skin condition that does not require systemic therapy, patients with autoimmune-related hypothyroidism on a stable dose of thyroid replacement hormone and/or controlled Type 1 diabetes mellitus on a stable insulin regimen may be included if in the opinion of the investigator it is appropriate and safe to do so.

Further exclusion criteria apply.

Treatment, groups and participation

The registry may describe treatments and study duration without a complete visit calendar. Ask the study team for the exact schedule, procedures, risks, costs and alternatives. Keep your usual care plan unless your treating clinician tells you otherwise.

Assignment

Random assignment

Masking

No masking

What researchers are measuring

Outcome measures describe what is being studied. They are not proof that a treatment works.

Primary measures

Secondary measures

Research locations (242)

The overall study status and a local site’s status can differ. Confirm that location’s availability before traveling.

242 locations

Study team and timeline

Lead sponsor

Boehringer Ingelheim

Study start

Apr 13, 2026 Actual

Primary completion

Sep 9, 2028 Estimated

Study completion

Jul 30, 2029 Estimated

First posted

Mar 16, 2026 Actual

Last updated

Nov 10, 2026 Actual

Official study contacts