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.
© 2021. The Author(s).
Publication types
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Clinical Trial, Phase II
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Randomized Controlled Trial
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Research Support, N.I.H., Extramural
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Research Support, Non-U.S. Gov't
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Research Support, U.S. Gov't, Non-P.H.S.
MeSH terms
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Adult
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Aged
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Antibodies, Monoclonal, Humanized / therapeutic use*
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Antigen Presentation / genetics
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Antineoplastic Combined Chemotherapy Protocols / therapeutic use*
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B7-H1 Antigen / metabolism
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Breast Neoplasms / drug therapy*
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Breast Neoplasms / genetics*
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Breast Neoplasms / immunology
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Breast Neoplasms / mortality
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Cytokines / blood
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Cytokines / immunology
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Drug Resistance, Neoplasm / genetics
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Estrogens / metabolism
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Female
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Furans / therapeutic use*
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Gene Expression Profiling
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Genetic Heterogeneity
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Genome, Human / genetics
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Genomics
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Humans
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Immune Checkpoint Inhibitors / therapeutic use
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Ketones / therapeutic use*
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Lymphocytes, Tumor-Infiltrating / immunology
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Male
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Middle Aged
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Mutation
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Neoplasm Metastasis
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Receptors, Estrogen / metabolism
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Receptors, Progesterone / metabolism
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Signal Transduction / genetics
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Survival Rate
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Treatment Outcome
Substances
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Antibodies, Monoclonal, Humanized
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B7-H1 Antigen
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CD274 protein, human
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Cytokines
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Estrogens
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Furans
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Immune Checkpoint Inhibitors
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Ketones
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Receptors, Estrogen
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Receptors, Progesterone
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pembrolizumab
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eribulin
Associated data
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ClinicalTrials.gov/NCT03051659