Tumor and Microenvironment Evolution during Immunotherapy with Nivolumab

Nadeem Riaz, Jonathan J. Havel, Vladimir Makarov, Alexis Desrichard, Walter J. Urba, Jennifer S. Sims, F. Stephen Hodi, Salvador Martín-Algarra, Rajarsi Mandal, William H. Sharfman, Shailender Bhatia, Wen Jen Hwu, Thomas F. Gajewski, Craig L. Slingluff, Diego Chowell, Sviatoslav M. Kendall, Han Chang, Rachna Shah, Fengshen Kuo, Luc G.T. MorrisJohn William Sidhom, Jonathan P. Schneck, Christine E. Horak, Nils Weinhold, Timothy A. Chan

Research output: Contribution to journalArticlepeer-review

Abstract

The mechanisms by which immune checkpoint blockade modulates tumor evolution during therapy are unclear. We assessed genomic changes in tumors from 68 patients with advanced melanoma, who progressed on ipilimumab or were ipilimumab-naive, before and after nivolumab initiation (CA209-038 study). Tumors were analyzed by whole-exome, transcriptome, and/or T cell receptor (TCR) sequencing. In responding patients, mutation and neoantigen load were reduced from baseline, and analysis of intratumoral heterogeneity during therapy demonstrated differential clonal evolution within tumors and putative selection against neoantigenic mutations on-therapy. Transcriptome analyses before and during nivolumab therapy revealed increases in distinct immune cell subsets, activation of specific transcriptional networks, and upregulation of immune checkpoint genes that were more pronounced in patients with response. Temporal changes in intratumoral TCR repertoire revealed expansion of T cell clones in the setting of neoantigen loss. Comprehensive genomic profiling data in this study provide insight into nivolumab's mechanism of action. Mutation burden decreases with successful checkpoint blockade therapy in patients with melanoma, suggesting that selection against mutant neoepitopes may be a critical mechanism of action of Nivolumab.

Original languageEnglish (US)
Pages (from-to)934-949.e15
JournalCell
Volume171
Issue number4
DOIs
StatePublished - Nov 2 2017

Keywords

  • T cell receptor repertoire
  • clonal evolution/clonal selection
  • immunotherapy
  • ipilimumab
  • melanoma
  • neoantigen load
  • nivolumab
  • tumor immune evasion
  • tumor microenvironment
  • tumor mutation load/tumor mutation burden

ASJC Scopus subject areas

  • Biochemistry, Genetics and Molecular Biology(all)

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