Aggressive tumor microenvironment of solid predominant lung adenocarcinoma subtype harboring with epidermal growth factor receptor mutations

Koichi Saruwatari, Shinnosuke Ikemura, Keigo Sekihara, Takeshi Kuwata, Satoshi Fujii, Shigeki Umemura, Keisuke Kirita, Shingo Matsumoto, Kiyotaka Yoh, Seiji Niho, Hironobu Ohmatsu, Atsushi Ochiai, Hirotsugu Kohrogi, Masahiro Tsuboi, Koichi Goto, Genichiro Ishii

Research output: Contribution to journalArticlepeer-review

36 Citations (Scopus)


Introduction: Tumor microenvironment critically affects cancer progression. This study aimed to identify differences in microenvironments of lung adenocarcinomas with epidermal growth factor receptor (EGFR) mutations by histological subtypes. Methods: The study cohort included 214 lung adenocarcinomas harboring EGFR mutations. We analyzed clinicopathological characteristics of lepidic (LPA), papillary (PPA), acinar (APA), and solid-predominant adenocarcinoma (SPA) subtypes, and examined expression levels of EGFR, E-cadherin, ezrin, laminin-5, ALDH1, and PD-L1 in cancer cells, and of CD34, CD204, podoplanin (PDPN), and FoxP3 in stromal cells in 4 subtypes (n = 20 each). Results: SPA displayed significantly more frequent lymph node metastasis, lymphovascular invasion, and worse prognosis than the other subtypes. Ezrin expression levels in SPA were also significantly higher than in LPA, PPA, or APA (P< 0.05, all). Laminin-5 and PD-L1 expression levels in SPA were significantly higher than in LPA (P< 0.01 for both) and PPA (P< 0.01 for both) and tended to be higher than in APA (laminin-5: P = 0.096, PD-L1: P = 0.081). Furthermore, SPA displayed higher levels of PDPN (+) cancer-associated fibroblasts (P< 0.01) and CD204 (+) tumor-associated macrophages (P< 0.05) than the other subtypes. Conclusion: Compared with other predominant subtypes with EGFR mutations, the microenvironment of SPA with EGFR mutations is characterized by cancer cells with higher invasive and immune evasion potential and more abundant stromal cells with tumor-promoting functions, which would contribute to the more aggressive behavior of SPA.

Original languageEnglish
Pages (from-to)7-14
Number of pages8
JournalLung Cancer
Publication statusPublished - 2016 Jan 1
Externally publishedYes


  • Cancer cells
  • Immunohistochemical staining
  • Lung adenocarcinoma with EGFR mutation
  • Microenvironment
  • Solid predominant adenocarcinoma
  • Stromal cells

ASJC Scopus subject areas

  • Oncology
  • Pulmonary and Respiratory Medicine
  • Cancer Research


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