Cancer-Germline Antigen Expression Discriminates Clinical Outcome to CTLA-4 Blockade

Sachet A. Shukla, Pavan Bachireddy, Bastian Schilling, Christina Galonska, Qian Zhan, Clyde Bango, Rupert Langer, Patrick C. Lee, Daniel Gusenleitner, Derin B. Keskin, Mehrtash Babadi, Arman Mohammad, Andreas Gnirke, Kendell Clement, Zachary J. Cartun, Eliezer M. Van Allen, Diana Miao, Ying Huang, Alexandra Snyder, Taha MerghoubJedd D. Wolchok, Levi A. Garraway, Alexander Meissner, Jeffrey S. Weber, Nir Hacohen, Donna Neuberg, Patrick R. Potts, George F. Murphy, Christine G. Lian, Dirk Schadendorf, F. Stephen Hodi, Catherine J. Wu

Research output: Contribution to journalArticlepeer-review

105 Scopus citations

Abstract

CTLA-4 immune checkpoint blockade is clinically effective in a subset of patients with metastatic melanoma. We identify a subcluster of MAGE-A cancer-germline antigens, located within a narrow 75 kb region of chromosome Xq28, that predicts resistance uniquely to blockade of CTLA-4, but not PD-1. We validate this gene expression signature in an independent anti-CTLA-4-treated cohort and show its specificity to the CTLA-4 pathway with two independent anti-PD-1-treated cohorts. Autophagy, a process critical for optimal anti-cancer immunity, has previously been shown to be suppressed by the MAGE-TRIM28 ubiquitin ligase in vitro. We now show that the expression of the key autophagosome component LC3B and other activators of autophagy are negatively associated with MAGE-A protein levels in human melanomas, including samples from patients with resistance to CTLA-4 blockade. Our findings implicate autophagy suppression in resistance to CTLA-4 blockade in melanoma, suggesting exploitation of autophagy induction for potential therapeutic synergy with CTLA-4 inhibitors. Increased expression of a subcluster of MAGE-A cancer-germline antigens predicts resistance specific to CTLA-4, but not PD-1, blockade, and its association with autophagy suppression implicates the role of autophagy in regulating primary resistance to anti-CTLA-4 therapy in melanoma patients.

Original languageEnglish (US)
Pages (from-to)624-633.e8
JournalCell
Volume173
Issue number3
DOIs
StatePublished - Apr 19 2018
Externally publishedYes

Keywords

  • CTLA-4
  • MAGE-A
  • PD-1
  • autophagy
  • cancer-germline antigen
  • checkpoint blockade
  • immunogenomics
  • immunotherapy
  • ipilimumab
  • melanoma

ASJC Scopus subject areas

  • General Biochemistry, Genetics and Molecular Biology

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