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Research Article|Articles in Press, 100494

Thyroid transcription factor 1 expression related to clinical outcomes of combined chemoimmunotherapy in patients with advanced lung adenocarcinoma: a prospective observational study1

Open AccessPublished:March 07, 2023DOI:https://doi.org/10.1016/j.jtocrr.2023.100494
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      Abstract

      Introduction

      Lung adenocarcinoma with negative thyroid transcription factor 1 (TTF-1) expression is believed to be a poor prognostic factor for certain systemic treatments. However, the impact of TTF-1 expression on combined chemoimmunotherapy remains unclear. We aimed to investigate the relationship between tumor TTF-1 expression and the efficacy of combined chemoimmunotherapy in patients with advanced lung adenocarcinoma.

      Methods

      This multicenter prospective observational study included 58 patients with advanced lung adenocarcinoma treated with combined chemoimmunotherapy across 10 institutions in Japan. The expression of TTF-1 in pretreatment tumors was determined using immunohistochemistry.

      Results

      The objective response rate of combined chemoimmunotherapy was significantly higher in TTF-1–positive groups than in TTF-1–negative groups (p = 0.02). The median progression-free survival (PFS) and overall survival were significantly longer in TTF-1–positive groups than in TTF-1–negative groups (10.9 vs. 5.0 months; p = 0.01). Multivariate analysis revealed that TTF-1 expression was an independent favorable prognostic factor for PFS. Moreover, TTF-1 expression in patients with lung adenocarcinoma is significantly associated with programmed death ligand 1 (PD-L1) expression (p = 0.003). The TTF-1–positive group with PD-L1 tumor proportion score ≥50% had a significantly longer PFS than other groups (p = 0.02).

      Conclusions

      TTF-1 positivity is associated with better clinical outcomes in patients with advanced lung adenocarcinoma treated with first-line combined chemoimmunotherapy.

      Keywords

      1Abbreviations:

      (TTF-1) (thyroid transcription factor 1), (PFS) (progression-free survival), (PD-L1) (programmed death ligand 1), (NSCLC) (non-small cell lung cancer), (ICI) (immune checkpoint inhibitor), (TPS) (tumor-proportion score), (OS) (overall survival), (ORR) (objective response rate), (HR) (hazard ratios), (CI) (confidence interval), (ECOG-PS) (Eastern Cooperative Oncology Group Performance Status), (EGFR) (epidermal growth factor receptor), (VEGF) (vascular endothelial growth factor)