: 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.

: 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.