Prognostic Impact of Programmed Death-ligand 1 and Surrounding Immune Status on Stage I Lung Cancer.

Abstract:

BACKGROUND:The programmed death 1/programmed death-ligand 1 (PD-L1) pathway reportedly is as an important factor determining effects of immunotherapy; however, its prognostic impact is controversial, and its association with the surrounding immune microenvironment has not yet been elucidated. PATIENTS AND METHODS:We retrospectively analyzed 126 patients with pathologic stage I non-small-cell lung cancer. Patients with lepidic-dominant adenocarcinoma were excluded. PD-L1 expression was evaluated with immunohistochemistry correlated with clinicopathologic features and surrounding immune microenvironment status, including CD4, CD8, regulatory T cells, and human leukocyte antigen class I. Factors affecting prognosis were assessed by Kaplan-Meier and Cox regression analyses. RESULTS:Twenty-three (18.3%) patients were positive for PD-L1 expression. No significant correlation was observed between PD-L1 expression and the surrounding immune microenvironment status. The PD-L1-positive group had a worse prognosis than the PD-L1-negative group (5-year recurrence-free survival rates, 63.4% vs. 81.0%; P = .061). Among surrounding immune cells, intratumoral CD8 status had the strongest impact on prognosis (P = .12). In the intratumoral CD8-high group, PD-L1 expression demonstrated no significant prognostic impact, whereas in the intratumoral CD8-low group, patients positive for PD-L1 demonstrated a significantly worse prognosis than those negative for PD-L1 (5-year recurrence-free survival rates, 41.7% vs. 78.6%; P = .034). Multivariable Cox regression analysis revealed that 'PD-L1-positive and intratumoral CD8-low' status was an independent prognostic factor (hazard ratio, 3.80; 95% confidence interval, 1.22-10.5; P = .023). CONCLUSIONS:The prognostic impact of the PD-1/PD-L1 pathway may be distinct according to concurrent intratumoral CD8 status.

journal_name

Clin Lung Cancer

journal_title

Clinical lung cancer

authors

Handa Y,Tsutani Y,Shiroma N,Kai Y,Mimae T,Miyata Y,Takeshima Y,Arihiro K,Okada M

doi

10.1016/j.cllc.2020.01.013

subject

Has Abstract

pub_date

2020-07-01 00:00:00

pages

e302-e314

issue

4

eissn

1525-7304

issn

1938-0690

pii

S1525-7304(20)30013-9

journal_volume

21

pub_type

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