Molecular correlates of response to eribulin and pembrolizumab in hormone receptor-positive metastatic breast cancer

Nat Commun. 2021 Sep 21;12(1):5563. doi: 10.1038/s41467-021-25769-z.

Abstract

Immune checkpoint inhibitors (ICIs) have minimal therapeutic effect in hormone receptor-positive (HR+ ) breast cancer. We present final overall survival (OS) results (n = 88) from a randomized phase 2 trial of eribulin ± pembrolizumab for patients with metastatic HR+ breast cancer, computationally dissect genomic and/or transcriptomic data from pre-treatment tumors (n = 52) for molecular associations with efficacy, and identify cytokine changes differentiating response and ICI-related toxicity (n = 58). Despite no improvement in OS with combination therapy (hazard ratio 0.95, 95% CI 0.59-1.55, p = 0.84), immune infiltration and antigen presentation distinguished responding tumors, while tumor heterogeneity and estrogen signaling independently associated with resistance. Moreover, patients with ICI-related toxicity had lower levels of immunoregulatory cytokines. Broadly, we establish a framework for ICI response in HR+ breast cancer that warrants diagnostic and therapeutic validation. ClinicalTrials.gov Registration: NCT03051659.

Publication types

  • Clinical Trial, Phase II
  • Randomized Controlled Trial
  • Research Support, N.I.H., Extramural
  • Research Support, Non-U.S. Gov't
  • Research Support, U.S. Gov't, Non-P.H.S.

MeSH terms

  • Adult
  • Aged
  • Antibodies, Monoclonal, Humanized / therapeutic use*
  • Antigen Presentation / genetics
  • Antineoplastic Combined Chemotherapy Protocols / therapeutic use*
  • B7-H1 Antigen / metabolism
  • Breast Neoplasms / drug therapy*
  • Breast Neoplasms / genetics*
  • Breast Neoplasms / immunology
  • Breast Neoplasms / mortality
  • Cytokines / blood
  • Cytokines / immunology
  • Drug Resistance, Neoplasm / genetics
  • Estrogens / metabolism
  • Female
  • Furans / therapeutic use*
  • Gene Expression Profiling
  • Genetic Heterogeneity
  • Genome, Human / genetics
  • Genomics
  • Humans
  • Immune Checkpoint Inhibitors / therapeutic use
  • Ketones / therapeutic use*
  • Lymphocytes, Tumor-Infiltrating / immunology
  • Male
  • Middle Aged
  • Mutation
  • Neoplasm Metastasis
  • Receptors, Estrogen / metabolism
  • Receptors, Progesterone / metabolism
  • Signal Transduction / genetics
  • Survival Rate
  • Treatment Outcome

Substances

  • Antibodies, Monoclonal, Humanized
  • B7-H1 Antigen
  • CD274 protein, human
  • Cytokines
  • Estrogens
  • Furans
  • Immune Checkpoint Inhibitors
  • Ketones
  • Receptors, Estrogen
  • Receptors, Progesterone
  • pembrolizumab
  • eribulin

Associated data

  • ClinicalTrials.gov/NCT03051659