A Study of Atezolizumab Plus Carboplatin and Etoposide With or Without Tiragolumab in Patients With Untreated Extensive-Stage Small Cell Lung Cancer
This study will evaluate the efficacy of tiragolumab plus atezolizumab and carboplatin and etoposide (CE) compared with placebo plus atezolizumab and CE in participants with chemotherapy-naive extensive-stage small cell lung cancer (ES-SCLC). Eligible participants will be stratified by Eastern Cooperative Oncology Group (ECOG) Performance Status (0 vs. 1), LDH (\</= upper limit of normal \[ULN\] vs. \> ULN), and presence or history of brain metastasis (yes vs. no) and randomly assigned in a 1:1 ratio to receive one of the following treatment regimens during induction phase: * Arm A: Tiragolumab plus atezolizumab plus CE * Arm B: Placebo plus atezolizumab plus CE Following the induction phase, participants will continue maintenance therapy with either atezolizumab plus tiragolumab (Arm A) or atezolizumab plus placebo (Arm B).
Ask AI to explain this studyKey things to know
This describes the study’s primary purpose.
Plus 3 other study approaches.
These are broad labels—not an eligibility decision.
Checked against the public recordLast updated Apr 3, 2026 · Source: ClinicalTrials.gov
Ask the study team to confirm whether enrollment is open.
Interventional
Locations may change over time.
Study sponsor
What this study is about
- Purpose
- Treatment
- Study type
- Interventional
- Phase
- Phase 3
- Sponsor
- Hoffmann-La Roche
- Interventions being studied
- Drug: Tiragolumab; Drug: Atezolizumab; Drug: Carboplatin; Drug: Etoposide; Drug: Placebo
How this study is categorized
These labels come from structured fields and exact terms in the public record.
Who may be able to participate
The sponsor separates these requirements into two groups. You do not need to interpret them alone—use them to guide a conversation with the study team.
- Histologically or cytologically confirmed extensive-stage small cell lung cancer (ES-SCLC)
- No prior systemic treatment for ES-SCLC
- Eastern Cooperative Oncology Group (ECOG) Performance Status of 0 or 1
- Measurable disease, as defined by Response Evaluation Criteria in Solid Tumors version 1.1 (RECIST v1.1)
- Adequate hematologic and end-organ function
- Treatment-free for at least 6 months since last chemo/radiotherapy, among those treated (with curative intent) with prior chemo/radiotherapy for limited-stage SCLC
- Symptomatic or actively progressing central nervous system (CNS) metastases
- Malignancies other than small cell lung cancer (SCLC) within 5 years prior to randomization, with the exception of those with a negligible risk of metastasis or death treated with expected curative outcome
- Active or history of autoimmune disease or immune deficiency
- History of idiopathic pulmonary fibrosis, organizing pneumonia, drug-induced pneumonitis, or idiopathic pneumonitis, or evidence of active pneumonitis on screening chest computed tomography (CT) scan
- Positive test result for human immunodeficiency virus (HIV)
- Active hepatitis B or hepatitis C
- Severe infection at the time of randomization
- Treatment with any other investigational agent within 28 days prior to initiation of study treatment
- Prior treatment with CD137 agonists or immune checkpoint blockade therapies, anti-cytotoxic T lymphocyte-associated protein 4 (anti-CTLA-4), anti-TIGIT, anti-PD-1, and anti-PD-L1 therapeutic antibodies
- Treatment with systemic immunostimulatory agents within 4 weeks or 5 drug elimination half-lives prior to randomization
Important: This is the sponsor’s public criteria, not a determination of eligibility. The study team must review your individual situation.
U.S. locations
- Rocky Mountain Cancer Centers - Lone TreeLone Tree, Colorado
- MedStar Georgetown University Hospital (Lombardi Comprehensive Cancer Center)Washington D.C., District of Columbia
- Florida Cancer SpecialistsFort Myers, Florida
- SCRI Florida Cancer Specialists NorthSarasota, Florida
- Northwest Georgia Oncology Centers PC - MariettaMarietta, Georgia
- Illinois Cancer CarePeoria, Illinois
- New England Cancer SpecialistsScarborough, Maine
- Weinberg Cancer Institution at Franklin SquareBaltimore, Maryland
- Minnesota Oncology HematologyMinneapolis, Minnesota
- Comprehensive Cancer Centers of NevadaHenderson, Nevada
- Broome Oncology - BinghamtonBinghamton, New York
- Memorial Sloan Kettering Cancer CenterNew York, New York
Source and freshness
Processed from ClinicalTrials.gov. Last public update: Apr 3, 2026. Always confirm current availability with the study team.