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Liu SV, Mok TSK, Nabet BY, Mansfield AS, De Boer R, Losonczy G, Sugawara S, Dziadziuszko R, Krzakowski M, Smolin A, Hochmair MJ, Garassino MC, Gay CM, Heymach JV, Byers LA, Lam S, Cardona A, Morris S, Adler L, Shames DS, Reck M. Clinical and molecular characterization of long-term survivors with extensive-stage small cell lung cancer treated with first-line atezolizumab plus carboplatin and etoposide. Lung Cancer 2023; 186:107418. [PMID: 37931445 DOI: 10.1016/j.lungcan.2023.107418] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2023] [Revised: 10/06/2023] [Accepted: 10/29/2023] [Indexed: 11/08/2023]
Abstract
OBJECTIVES In the Phase I/III IMpower133 study, first-line atezolizumab plus carboplatin and etoposide (CP/ET) treatment for extensive-stage small cell lung cancer (ES-SCLC) significantly improved overall survival (OS) and progression-free survival versus placebo plus CP/ET. We explored patient and disease characteristics associated with long-term survival in IMpower133, and associations of differential gene expression and SCLC-A (ASCL1-driven), SCLC-N (NEUROD1-driven), SCLC-P (POU2F3-driven), and SCLC-inflamed (SCLC-I) transcriptional subtypes with long-term survival. MATERIALS AND METHODS Patients with previously untreated ES-SCLC were randomized 1:1 to four 21-day cycles of CP/ET with atezolizumab or placebo. Long-term survivors (LTS) were defined as patients who lived ≥ 18 months post randomization. A generalized linear model was used to evaluate the odds of living ≥ 18 months. Differential gene expression was analyzed using RNA-sequencing data in LTS and non-LTS. OS was assessed by T-effector and B-cell gene signature expression. Distribution of SCLC transcriptional subtypes was assessed in LTS and non-LTS. RESULTS More LTS were in the atezolizumab arm (34%) than in the placebo arm (20%). The odds ratio for living ≥ 18 months in the atezolizumab arm versus the placebo arm was 2.1 (P < 0.03). Enhanced immune-related signaling was seen in LTS in both arms. Exploratory OS analyses showed atezolizumab treatment benefit versus placebo across T-effector and B-cell gene signature expression subgroups. A higher proportion of LTS than non-LTS in both arms had the SCLC-I subtype; this difference was particularly pronounced in the atezolizumab arm. CONCLUSION These exploratory analyses suggest that long-term survival is more likely with atezolizumab than placebo in ES-SCLC, confirming the treatment benefit of the IMpower133 regimen. CLINICALTRIAL gov Identifier: NCT02763579.
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Affiliation(s)
- Stephen V Liu
- Lombardi Comprehensive Cancer Center, Georgetown University, Washington, DC, USA.
| | - Tony S K Mok
- State Key Laboratory of Translational Oncology, The Chinese University of Hong Kong, Hong Kong, China
| | | | | | | | - György Losonczy
- Department of Pulmonology, Semmelweis University, Budapest, Hungary
| | | | - Rafal Dziadziuszko
- Department of Oncology and Radiotherapy and Early Phase Clinical Trials Center, Medical University of Gdańsk, Gdańsk, Poland
| | - Maciej Krzakowski
- Maria Sklodowska Curie National Research Institute of Oncology, Warsaw, Poland
| | - Alexey Smolin
- Burdenko Main Military Clinical Hospital, Moscow, Russia
| | - Maximilian J Hochmair
- Karl Landsteiner Institute of Lung Research and Pulmonary Oncology, Vienna North Hospital Klinik Floridsdorf, Vienna, Austria
| | - Marina C Garassino
- The University of Chicago Department of Hematology/Oncology, Chicago, IL, USA
| | - Carl M Gay
- Department of Thoracic/Head & Neck Medical Oncology, The University of Texas MD Anderson Cancer Center, Houston, TX, USA
| | - John V Heymach
- Department of Thoracic/Head & Neck Medical Oncology, The University of Texas MD Anderson Cancer Center, Houston, TX, USA
| | - Lauren A Byers
- Department of Thoracic/Head & Neck Medical Oncology, The University of Texas MD Anderson Cancer Center, Houston, TX, USA
| | | | | | | | - Leah Adler
- F. Hoffmann-La Roche Ltd., Basel, Switzerland
| | | | - Martin Reck
- Lung Clinic Grosshansdorf, Airway Research Center North, German Center of Lung Research, Grosshansdorf, Germany
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