PD-L1 expression according to the EGFR status in primary lung adenocarcinoma

Kazuki Takada, Gouji Toyokawa, Tetsuzo Tagawa, Kenichi Kohashi, Mototsugu Shimokawa, Takaki Akamine, Shinkichi Takamori, Fumihiko Hirai, Fumihiro Shoji, Tatsuro Okamoto, Yoshinao Oda, Yoshihiko Maehara

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Abstract

Objectives It was reported that programmed cell death-ligand 1 (PD-L1) expression is associated with smoking and wild-type epidermal growth factor receptor (EGFR) in lung adenocarcinoma. However, the association between PD-L1 expression and EGFR mutation site in EGFR mutation-positive lung adenocarcinoma is unclear. Materials and methods We retrospectively examined the relationship between PD-L1 expression and EGFR status in 441 surgically resected primary lung adenocarcinomas. Membrane PD-L1 expression on tumor cells was evaluated by immunohistochemical analysis using a PD-L1 antibody (clone SP142) and defined by tumor proportion scores (TPSs) of 0%, 1–4%, 5–49%, and ≥50%, respectively. Results Two hundred and eighteen (49.4%) patients had wild-type EGFR, and 223 (50.6%) had mutant EGFR—98 (44.0%) with exon 19 deletion, 116 (52.0%) with exon 21 L858R point mutation, and nine (4.0%) with another EGFR mutation. Overall, Fisher's exact test showed that PD-L1 positivity was associated with wild-type EGFR, and there was only one case with PD-L1 TPS ≥50% among the cases with mutant EGFR. The analysis of cases with mutant EGFR indicated no significant association between EGFR mutation site and PD-L1 expression. However, the prevalence of PD-L1 TPS 5–49% was higher among patients with EGFR exon 19 deletion than with EGFR exon 21 L858R point mutation. Conclusions PD-L1 expression was significantly associated with wild-type EGFR, and PD-L1 TPS ≥50% seldom overlaps with presence of driver oncogene EGFR. There was no significant difference in PD-L1 expression among the EGFR mutation sites

Original languageEnglish
Pages (from-to)1-6
Number of pages6
JournalLung Cancer
Volume116
DOIs
Publication statusPublished - Feb 2018

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All Science Journal Classification (ASJC) codes

  • Oncology
  • Pulmonary and Respiratory Medicine
  • Cancer Research

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