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Dawe DE, Rittberg R, Syed I, Shanahan MK, Moldaver D, Bucher O, Galloway K, Reynolds K, Paul JT, Harlos C, Kim JO, Banerji S. Real-world predictors of survival in patients with extensive-stage small-cell lung cancer in Manitoba, Canada: a retrospective cohort study. Front Oncol 2023; 13:1191855. [PMID: 37795434 PMCID: PMC10545857 DOI: 10.3389/fonc.2023.1191855] [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] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2023] [Accepted: 08/07/2023] [Indexed: 10/06/2023] Open
Abstract
Background Extensive-stage small-cell lung cancer (ES-SCLC) is an incurable cancer with poor prognosis in which characteristics predictive of long-term survival are debated. The utility of agents such as immune checkpoint inhibitors highlights the importance of identifying key characteristics and treatment strategies that contribute to long-term survival and could help guide therapeutic decisions. Objective This real-world analysis examines the characteristics, treatment patterns, and clinical outcomes of patients receiving chemotherapy without immunotherapy for ES-SCLC in Manitoba, Canada. Methods A retrospective cohort study assessed patient characteristics, treatment, and survival duration (short: <6 months; medium: 6-24 months; long: >24 months) using the Manitoba Cancer Registry and CancerCare Manitoba records. Eligible patients were aged >18 years with cytologically confirmed ES-SCLC diagnosed between January 1, 2004, and December 31, 2018, and received cytotoxic chemotherapy (CT). The one-, two-, and five-year probabilities of overall survival (OS) were assessed relative to patient, disease, and treatment characteristics using Kaplan-Meier methods and Cox proportional hazards models. Results This analysis included 537 patients. Cisplatin was used in 56.1% of patients, 45.6% received thoracic radiotherapy (RT), and few received prophylactic cranial irradiation (PCI). In the overall cohort, one-, two- and five-year OS rates were 26%, 8%, and 3%, respectively. For patients with Eastern Cooperative Oncology Group Performance Status (ECOG PS) 0, OS rates at one, two, and five years were 43%, 17%, and 10%, respectively, vs. 27%, 8%, and 2% for those with ECOG PS 1-2, and 16%, 3%, and 3% for those with ECOG PS 3-4. In long-term survivors, ECOG PS scores were lower and abnormal laboratory test results were less frequent. Overall, 74.4% of long-term survivors received thoracic RT and 53.5% received PCI. Known poor prognostic factors - including brain/liver metastases, high lactate dehydrogenase (LDH), abnormal sodium, and low hemoglobin levels - were less common but still seen in long-term survivors. Conclusion Although rare, patients with ES-SCLC may experience long-term survival with CT ± thoracic RT ± PCI. Factors predicting long-term survival include traditional prognostic factors such as ECOG PS, LDH level, and receipt of thoracic RT or PCI. These findings support current treatment algorithms for ES-SCLC and provide baseline survival estimates to assess the real-world impact of adding immune checkpoint inhibitors in the future.
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Affiliation(s)
- David E. Dawe
- Department of Internal Medicine, University of Manitoba, Winnipeg, MB, Canada
- Department of Hematology and Medical Oncology, CancerCare Manitoba, Winnipeg, MB, Canada
- CancerCare Manitoba Research Institute, CancerCare Manitoba, Winnipeg, MB, Canada
| | - Rebekah Rittberg
- Department of Internal Medicine, University of Manitoba, Winnipeg, MB, Canada
- Department of Hematology and Medical Oncology, CancerCare Manitoba, Winnipeg, MB, Canada
| | - Iqra Syed
- AstraZeneca Canada, Mississauga, ON, Canada
| | | | | | - Oliver Bucher
- Department of Epidemiology and Cancer Registry, CancerCare Manitoba, Winnipeg, MB, Canada
| | - Katie Galloway
- Department of Epidemiology and Cancer Registry, CancerCare Manitoba, Winnipeg, MB, Canada
| | - Kayla Reynolds
- Department of Cellular & Physiological Sciences, University of British Columbia, Vancouver, BC, Canada
| | - James T. Paul
- Department of Internal Medicine, University of Manitoba, Winnipeg, MB, Canada
- Department of Hematology and Medical Oncology, CancerCare Manitoba, Winnipeg, MB, Canada
| | - Craig Harlos
- Department of Internal Medicine, University of Manitoba, Winnipeg, MB, Canada
- Department of Hematology and Medical Oncology, CancerCare Manitoba, Winnipeg, MB, Canada
| | - Julian O. Kim
- Department of Radiology, University of Manitoba, Winnipeg, MB, Canada
- Department of Radiation Oncology, CancerCare Manitoba, Winnipeg, MB, Canada
| | - Shantanu Banerji
- Department of Internal Medicine, University of Manitoba, Winnipeg, MB, Canada
- Department of Hematology and Medical Oncology, CancerCare Manitoba, Winnipeg, MB, Canada
- CancerCare Manitoba Research Institute, CancerCare Manitoba, Winnipeg, MB, Canada
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