Journal for ImmunoTherapy of Cancer (Apr 2021)

Intratumoral CD103+ CD8+ T cells predict response to PD-L1 blockade

  • Marcin Kowanetz,
  • Thomas Powles,
  • Hartmut Koeppen,
  • Jane Grogan,
  • Patrick Caplazi,
  • Ira Mellman,
  • Wei Zou,
  • Sanjeev Mariathasan,
  • Priti S. Hegde,
  • Mark McCleland,
  • Jacqueline McBride,
  • Zora Modrusan,
  • Romain Banchereau,
  • Avantika S. Chitre,
  • Alexis Scherl,
  • Thomas D. Wu,
  • Namrata S. Patil,
  • Patricia de Almeida,
  • Edward E. Kadel, III,
  • Shravan Madireddi,
  • Amelia Au-Yeung,
  • Chikara Takahashi,
  • Ying-Jiun Chen,
  • Rhea Nersesian,
  • Ehab A. El-Gabry,
  • Mark D. Robida,
  • Jeffrey C. Hung,
  • Shadi Toghi Eshgi,
  • W. Rodney Mathews,
  • William E O'Gorman

DOI
https://doi.org/10.1136/jitc-2020-002231
Journal volume & issue
Vol. 9, no. 4

Abstract

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Background CD8+ tissue-resident memory T (TRM) cells, marked by CD103 (ITGAE) expression, are thought to actively suppress cancer progression, leading to the hypothesis that their presence in tumors may predict response to immunotherapy.Methods Here, we test this by combining high-dimensional single-cell modalities with bulk tumor transcriptomics from 1868 patients enrolled in lung and bladder cancer clinical trials of atezolizumab (anti-programmed cell death ligand 1 (PD-L1)).Results ITGAE was identified as the most significantly upregulated gene in inflamed tumors. Tumor CD103+ CD8+ TRM cells exhibited a complex phenotype defined by the expression of checkpoint regulators, cytotoxic proteins, and increased clonal expansion.Conclusions Our analyses indeed demonstrate that the presence of CD103+ CD8+ TRM cells, quantified by tracking intratumoral CD103 expression, can predict treatment outcome, suggesting that patients who respond to PD-1/PD-L1 blockade are those who exhibit an ongoing antitumor T-cell response.