Chemoimmunotherapy as the First-Line Treatment for Patients With Extensive-Stage Small-Cell Lung Cancer and an ECOG Performance Status 2 or 3

Background: Studies demonstrated that chemoimmunotherapy prolongs progression-free survival (PFS) and overall survival (OS) in patients with extensive-stage small-cell lung cancer (ES-SCLC) and an Eastern Cooperative Oncology Group performance status (ECOG PS) 0 or 1. However, there is little data regarding chemoimmunotherapy in patients with ES-SCLC and an ECOG PS 2 or 3. This study aims to evaluate the benefits of chemoimmunotherapy compared to chemotherapy in the first-line treatment of patients with ES-SCLC and ECOG PS 2 or 3. Materials and Methods: This retrospective study analyzed 46 adults treated at Mayo Clinic between 2017 and 2020 with de novo ES-SCLC and an ECOG PS 2 or 3. Twenty patients received platinum-etoposide and 26 patients received platinum-etoposide and atezolizumab. Progression-free survival (PFS) and Overall survival (OS) were calculated using Kaplan-Meier methods. Results: PFS was longer in the chemoimmunotherapy group compared to the chemotherapy group, 4.1 months (95% confidence interval [CI]: 3.8-6.9) vs. 3.2 months (95% CI: 0.6-4.8), respectively; P = 0.0491. However, there was no statistically significant difference in the OS between the chemoimmunotherapy and chemotherapy group, 9.3 months (95% CI:: 4.9-12.8) vs. 7.6 months (95% CI: 0.6-11.9), respectively; P = .21. Conclusion: Chemoimmunotherapy prolongs PFS compared to chemotherapy in patients with newly diagnosed ES-SCLC and an ECOG PS 2 or 3. No OS difference was observed among the chemoimmunotherapy and chemotherapy groups; nevertheless, this may be attributed due to the small sample size of the study.