Impact of thoracic radiotherapy on first-line treatment outcomes in ES-SCLC patients

Cancer Med. 2024 Sep;13(17):e70175. doi: 10.1002/cam4.70175.

Abstract

Background: The therapeutic advantage of thoracic radiotherapy (tRT) as an adjunct to first-line immunotherapy and chemotherapy in patients with extensive-stage small cell lung cancer (ES-SCLC) remains unclear. We sought to elucidate this in a retrospective cohort study comparing the effectiveness and safety of tRT in combination with first-line immunotherapy and chemotherapy.

Methods: Our retrospective study included patients with ES-SCLC, treated at the West China Hospital between January 2019 and December 2022. They received first-line immunotherapy and chemotherapy and were categorized into two cohorts based on the administration of tRT. The primary outcomes were overall survival (OS) and progression-free survival (PFS). Cox regression analysis was utilized to identify potential independent predictors of prognosis and to compare the treatment outcomes across various patient subgroups. Treatment-related toxicities across both cohorts were compared using the Chi-squared test.

Results: A total of 99patients were eligible for the study, out of which 55 received tRT. The medianduration of follow-up was 39 months. Remarkably, patients who received tRTdemonstrated superior OS and PFS in comparison to those who did not (P < 0.05). Subgroup analysis further confirmed these findings. Multivariate analysisidentified treatment group and liver metastasis as independent prognosticfactors (P < 0.05). The incidence of grade 3-4 adverse events showed nostatistically significant difference between the two cohorts.

Conclusions: Thus, weconfirmed that the addition of tRT to the conventional regimen of first-linechemotherapy and immunotherapy yields better survival outcomes without asignificant increase in toxicity.

Keywords: Chemotherapy; Extensive‐stage small cell lung cancer; Immunotherapy; Survival outcomes; Thoracic radiotherapy.

MeSH terms

  • Adult
  • Aged
  • Combined Modality Therapy
  • Female
  • Humans
  • Immunotherapy / methods
  • Lung Neoplasms* / mortality
  • Lung Neoplasms* / pathology
  • Lung Neoplasms* / radiotherapy
  • Lung Neoplasms* / therapy
  • Male
  • Middle Aged
  • Prognosis
  • Progression-Free Survival
  • Retrospective Studies
  • Small Cell Lung Carcinoma* / drug therapy
  • Small Cell Lung Carcinoma* / mortality
  • Small Cell Lung Carcinoma* / pathology
  • Small Cell Lung Carcinoma* / radiotherapy
  • Small Cell Lung Carcinoma* / therapy
  • Treatment Outcome