Programmed Death-Ligand 1 Expression Predicts Tyrosine Kinase Inhibitor Response and Better Prognosis in a Cohort of Patients With Epidermal Growth Factor Receptor Mutation-Positive Lung Adenocarcinoma.

Abstract:

BACKGROUND:The immune checkpoint proteins programmed death-1/ligand (PD-1/PD-L1) play a critical role in immune escape of tumor cells. In models of epidermal growth factor receptor (EGFR)-driven non-small-cell lung cancer (NSCLC), EGFR signal upregulates PD-1/PD-L1. However, data on the clinical significance of PD1/PD-L1 expression in patients with the subtype of NSCLC carrying EGFR mutations remain limited. MATERIALS AND METHODS:Immunohistochemistry was performed to evaluate the expression of PD-1, PD-L1, and CD4+ and CD8+ tumor-infiltrating T lymphocytes (TILs). RESULTS:In a cohort of 56 patients, PD-L1 and PD-1 was positive in 53.6% and 32.1% of tumor specimens, respectively. PD-L1(+) patients had a significantly greater disease-control rate (P = .004), in association with longer progression-free survival (P = .001) after EGFR-tyrosine kinase inhibitor (TKI) therapy and overall survival (P = .004), and no correlation between PD-1 positivity and clinical outcomes was observed. PD-L1 expression was not significantly associated with either clinicopathologic features or TILs. CONCLUSIONS:These findings suggest that this subtype of EGFR mutation-positive NSCLC is highly eligible for PD-1/PD-L1 immunotherapy. PD-L1 might represent a favorable biomarker candidate for the response to EGFR-TKIs and outcomes of these patients with NSCLC.

journal_name

Clin Lung Cancer

journal_title

Clinical lung cancer

authors

Lin C,Chen X,Li M,Liu J,Qi X,Yang W,Zhang H,Cai Z,Dai Y,Ouyang X

doi

10.1016/j.cllc.2015.02.002

subject

Has Abstract

pub_date

2015-09-01 00:00:00

pages

e25-35

issue

5

eissn

1525-7304

issn

1938-0690

pii

S1525-7304(15)00055-8

journal_volume

16

pub_type

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