Temporal and spatial discordance of programmed cell death-ligand 1 expression and lymphocyte tumor infiltration between paired primary lesions and brain metastases in lung cancer

Aaron Mansfield, M. C. Aubry, J. C. Moser, S. M. Harrington, Roxana S Dronca, Sean S Park, Haidong M Dong

Research output: Contribution to journalArticle

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Abstract

BACKGROUND: The dynamics of PD-L1 expression may limit its use as a tissue-based predictive biomarker. We sought to expand our understanding of the dynamics of PD-L1 expression and tumor-infiltrating lymphocytes (TILs) in patients with lung cancer-related brain metastases.

EXPERIMENTAL DESIGN: Paired primary lung cancers and brain metastases were identified and assessed for PD-L1 and CD3 expression by immunohistochemistry. Lesions with 5% or greater PD-L1 expression were considered positive. Agreement statistics and the χ(2) or Fisher's exact test were used for analysis.

RESULTS: We analyzed 146 paired lesions from 73 cases. There was disagreement of tumor cell PD-L1 expression in 10 cases (14%, κ = 0.71), and disagreement of TIL PD-L1 expression in 19 cases (26%, κ = 0.38). Most paired lesions with discordant tumor cell expression of PD-L1 were obtained 6 or more months apart. When specimens were categorized using a proposed tumor microenvironment categorization scheme based on PD-L1 expression and TILs, there were significant changes in the classifications because many of the brain metastases lacked either PD-L1 expression, tumor lymphocyte infiltration or both even when they were present in the primary lung cancer specimens (P = 0.009).

CONCLUSIONS: We identified that there are significant differences between the tumor microenvironment of paired primary lung cancers and brain metastases. When physicians decide to treat patients with lung cancer with a PD-1 or PD-L1 inhibitor, they must do so in the context of the spatial and temporal heterogeneity of the tumor microenvironment.

Original languageEnglish (US)
Pages (from-to)1953-1958
Number of pages6
JournalAnnals of oncology : official journal of the European Society for Medical Oncology
Volume27
Issue number10
DOIs
StatePublished - Oct 1 2016

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Keywords

  • heterogeneity
  • lung cancer
  • metastasis
  • PD-L1
  • tumor immunology

ASJC Scopus subject areas

  • Hematology
  • Oncology

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