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Erschienen in: Breast Cancer Research and Treatment 1/2021

19.09.2020 | Preclinical study

Serial single-cell profiling analysis of metastatic TNBC during Nab-paclitaxel and pembrolizumab treatment

verfasst von: Jiehui Deng, Aatish Thennavan, Suhagi Shah, Ece Bagdatlioglu, Natalie Klar, Adriana Heguy, Christian Marier, Peter Meyn, Yutong Zhang, Kristen Labbe, Christina Almonte, Michelle Krogsgaard, Charles M. Perou, Kwok-Kin Wong, Sylvia Adams

Erschienen in: Breast Cancer Research and Treatment | Ausgabe 1/2021

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Abstract

Purpose

Immunotherapy has recently been shown to improve outcomes for advanced PD-L1-positive triple-negative breast cancer (TNBC) in the Impassion130 trial, leading to FDA approval of the first immune checkpoint inhibitor in combination with taxane chemotherapy. To further develop predictive biomarkers and improve therapeutic efficacy of the combination, interrogation of the tumor immune microenvironment before therapy as well as during each component of treatment is crucial. Here we use single-cell RNA sequencing (scRNA-seq) on tumor biopsies to assess immune cell changes from two patients with advanced TNBC treated in a prospective trial at predefined serial time points, before treatment, on taxane chemotherapy and on chemo-immunotherapy.

Methods

Both patients (one responder and one progressor) received the trial therapy, in cycle 1 nab-paclitaxel given as single agent, in cycle 2 nab-paclitaxel in combination with pembrolizumab. Tumor core biopsies were obtained at baseline, 3 weeks (after cycle 1, chemotherapy alone) and 6 weeks (after cycle 2, chemo-immunotherapy). Single-cell RNA sequencing (scRNA-seq) of both cancer cells and infiltrating immune cells isolated were performed from fresh tumor core biopsy specimens by 10 × chromium sequencing.

Results

ScRNA-seq analysis showed significant baseline heterogeneity of tumor-infiltrating immune cell populations between the two patients as well as modulation of the tumor microenvironment by chemotherapy and immunotherapy. In the responding patient there was a population of PD-1high-expressing T cells which significantly decreased after nab-paclitaxel plus pembrolizumab treatment as well as a presence of tissue-resident memory T cells (TRM). In contrast, tumors from the patient with rapid disease progression showed a prevalent and persistent myeloid compartment.

Conclusions

Our study provides a deep cellular analysis of on-treatment changes during chemo-immunotherapy for advanced TNBC, demonstrating not only feasibility of single-cell analyses on serial tumor biopsies but also the heterogeneity of TNBC and differences in on-treatment changes in responder versus progressor.
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Metadaten
Titel
Serial single-cell profiling analysis of metastatic TNBC during Nab-paclitaxel and pembrolizumab treatment
verfasst von
Jiehui Deng
Aatish Thennavan
Suhagi Shah
Ece Bagdatlioglu
Natalie Klar
Adriana Heguy
Christian Marier
Peter Meyn
Yutong Zhang
Kristen Labbe
Christina Almonte
Michelle Krogsgaard
Charles M. Perou
Kwok-Kin Wong
Sylvia Adams
Publikationsdatum
19.09.2020
Verlag
Springer US
Erschienen in
Breast Cancer Research and Treatment / Ausgabe 1/2021
Print ISSN: 0167-6806
Elektronische ISSN: 1573-7217
DOI
https://doi.org/10.1007/s10549-020-05936-4

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