A Study of the Safety and Effectiveness of Atezolizumab Combined with Etoposide, and Carboplatin for Patients with Untreated Extensive-Stage Small Cell Lung Cancer


About this study

This randomized, Phase I/III, multicenter, double-blinded, placebo-controlled study is designed to evaluate the safety and efficacy of atezolizumab (anti-programmed death ligand 1 [anti-PD-L1]) in combination with carboplatin plus (+) etoposide compared with treatment with placebo + carboplatin + etoposide in treatment-naive participants with extensive-stage small cell lung cancer (ES-SCLC). Participants will be randomized in a 1:1 ratio to receive either atezolizumab + carboplatin + etoposide or placebo + carboplatin + etoposide on 21 day-cycles for 4 cycles in the induction phase followed by maintenance with atezolizumab or placebo until disease progression (PD) as assessed by the investigator using Response Evaluation Criteria in Solid Tumors version 1.1 (RECIST v1.1). Treatment can be continued until persistent radiographic PD or symptomatic deterioration.

Participation eligibility

Participant eligibility includes age, gender, type and stage of disease, and previous treatments or health concerns. Guidelines differ from study to study, and identify who can or cannot participate. There is no guarantee that every individual who qualifies and wants to participate in a trial will be enrolled. Contact the study team to discuss study eligibility and potential participation.

Inclusion Criteria:

  • Participants 18 years of age or older
  • Histologically or cytologically confirmed ES-SCLC (per the Veterans Administration Lung Study Group [VALG] staging system)
  • No prior treatment for ES-SCLC
  • ECOG performance status of 0 or 1
  • Measurable disease, as defined by RECIST v1.1
  • Adequate hematologic and end organ function

Exclusion Criteria:

  • Active or untreated central nervous system (CNS) metastases as determined by computed tomography (CT) or magnetic resonance imaging (MRI) evaluation
  • Malignancies other than 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
  • Pregnant or lactating women
  • History of autoimmune disease
  • History of idiopathic pulmonary fibrosis, organizing pneumonia, drug induced pneumonitis, idiopathic pneumonitis, or evidence of active pneumonitis on screening chest Computed Tomography (CT) scan. History of radiation pneumonitis in the radiation field (fibrosis) is permitted.
  • Positive test for Human Immunodeficiency Virus (HIV)
  • Active hepatitis B or hepatitis C
  • Severe infections at the time of enrollment
  • Significant cardiovascular disease
  • Prior treatment with cluster of differentiation 137 (CD137) agonists or immune checkpoint blockade therapies, anti-PD1, and anti-PD-L1 therapeutic antibody

Participating Mayo Clinic locations

Study statuses change often. Please contact the study team for the most up-to-date information regarding possible participation.

Mayo Clinic Location Status Contact

Rochester, Minn.

Mayo Clinic principal investigator

Aaron Mansfield, M.D.

Closed for enrollment

Contact information:

Cancer Center Clinical Trials Referral Office

(855) 776-0015

More information


Publications are currently not available

Additional contact information

Cancer-related trials contact form

Phone: 855-776-0015 (toll-free)

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