Abstract
Background
Immune checkpoint inhibitors (ICIs) have become a standard therapy in non-small cell lung cancer (NSCLC). Although lung cancer adjoining emphysematous bullae (Ca-ADJ) were reported to express higher programmed cell death-ligand 1 (PD-L1), the predictive impact of Ca-ADJ on the response to ICIs is unknown.
Methods
Two hundred and fifty-seven advanced or recurrent NSCLC patients treated with ICI monotherapy at Kyushu University Hospital and National Hospital Organization Kyushu Cancer Center were analyzed. To minimize the bias arising from the patients’ background, adjusted Kaplan–Meier survival curves and Cox proportional hazards regression analyses using inverse probability of treatment weights (IPTW) were performed.
Results
Of the 257 patients, 55 had Ca-ADJ. Patients with Ca-ADJ were significantly associated with younger age (P = 0.0343), male sex (P = 0.0070), and smoking (P = 0.0080). The objective response rate of cases with Ca-ADJ was significantly higher than that of those without Ca-ADJ (36.4% vs. 20.8%, respectively; P = 0.0167). The disease control rate of cases with Ca-ADJ was also significantly higher than tumors without Ca-ADJ (63.6% vs. 47.5%, respectively; P = 0.0341). The IPTW-adjusted Kaplan–Meier curves showed that patients with Ca-ADJ had significantly longer progression-free survival (PFS) and overall survival (OS) than those without Ca-ADJ (P = 0.0407 and P = 0.0126, respectively). On IPTW-adjusted Cox analysis, Ca-ADJ was an independent predictor of PFS and OS (P < 0.0001 and P < 0.0001, respectively).
Conclusions
Patients with Ca-ADJ may be good candidates for ICIs. These findings should be validated prospectively.
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Availability of data and materials
The data that support the findings of this study are available from the corresponding author upon reasonable request.
Abbreviations
- Ca-ADJ:
-
Cancer adjoining emphysematous bullae
- EB:
-
Emphysematous bullae
- ECOG PS:
-
Eastern Cooperative Oncology Group performance status
- EGFR:
-
Epidermal growth factor receptor
- ICI:
-
Immune checkpoint inhibitor
- IPTW:
-
Inverse probability of treatment weights
- NSCLC:
-
Non-small cell lung cancer
- OS:
-
Overall survival
- PD-L1:
-
Programmed death-ligand 1
- PFS:
-
Progression-free survival
- TMB:
-
Tumor mutation burden
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Takamori, S., Takada, K., Shimokawa, M. et al. Prognostic impact of primary cancer adjoining emphysematous bullae in non-small cell lung cancer patients treated with immune checkpoint inhibitors. Cancer Immunol Immunother 70, 1745–1753 (2021). https://doi.org/10.1007/s00262-020-02783-6
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DOI: https://doi.org/10.1007/s00262-020-02783-6