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RecruitingLast updated: 10 July 2026

DAREON-LUNG-1: A study in people with advanced small cell lung cancer to compare obrixtamig plus standard treatment with standard treatment aloneA Phase III Multi-center, Open-label, Randomised Trial of Intravenous Obrixtamig in Combination With Atezolizumab, Carboplatin, and Etoposide vs. Atezolizumab, Carboplatin, and Etoposide as First-line Treatment in Patients With Extensive-stage Small Cell Lung Cancer

Trial purpose

Medical clipboardCancer treatment

Tumor type

Lung Cancers Lung cancer

Age

People18+

Trial acronym

DAREON-LUNG-1

Clinical summary

Summary

This study is open to adults with advanced small cell lung cancer (SCLC).

The purpose 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 in the study 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 participants are given as infusions into a vein (IV).

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

Conditions

This trial is treating people with extensive-stage small cell lung cancer

Eligibility

Inclusion

  1. Patients with histologically confirmed Extensive-stage Small Cell Lung Cancer (ES-SCLC)
  2. Patients without any previous systematic anti-cancer treatment for ES-SCLC. Patients who received previous systematic 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 14 days prior to randomisation and 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 are 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

  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 sites within 14 days prior to randomisation
  4. Persistent toxicity from previous treatments that has not resolved to ≤ Common Terminology Criteria for Adverse Events (CTCAE) Grade 1 (except for alopecia, asthenia/fatigue, amenorrhea/menstrual disorders, CTCAE Grade 2 peripheral neuropathy, and 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)
  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.

Inclusion

  • Your cancer has spread to other parts of the body (metastatic) or has grown into nearby parts of the body (locally advanced).

Exclusion

  • You have certain types of non-cancer medical conditions.
  • You have had certain treatments, surgical procedures or drugs.
Message

Clinical trials have complex eligibility criteria, and other criteria may apply for this trial. Ask your doctor about whether this trial could be right for you.

Participating hospitals

Recruiting hospitals

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More information

Trial Identifiers

Information on this page is partially produced from ClinicalTrials.gov, EU Clinical Trials Register *. View further details about this trial on the registry via the links below:

  • NCT07472517 *
  • 2025-520565-51-00 *
  • 1438-0012; U1111-1317-4955

Trial sponsor

Boehringer Ingelheim

Scientific Title

A Phase III Multi-center, Open-label, Randomised Trial of Intravenous Obrixtamig in Combination With Atezolizumab, Carboplatin, and Etoposide vs. Atezolizumab, Carboplatin, and Etoposide as First-line Treatment in Patients With Extensive-stage Small Cell Lung Cancer

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