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Pembrolizumab and atezolizumab in triple-negative breast cancer

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Abstract

Triple-negative breast cancer (TNBC) is defined by a lack of expression of both estrogen (ER) and progesterone (PgR) receptors as well as human epidermal growth factor receptor 2 (HER2) and is associated with poor prognosis. Moreover, the systemic treatment options are limited. However, the TNBC is more likely than other breast cancer subtypes to benefit from immune checkpoint blockade therapy due to its higher immunogenicity, higher enrichment by tumour-infiltrating lymphocytes (TILs), and higher levels of programmed cell death ligand 1 (PD-L1) expression. Thus far, atezolizumab was approved in combination with nab-paclitaxel for patients with unresectable locally advanced or metastatic TNBC whose tumours express PD-L1. Currently, it seems that PD-L1-positive subgroup will potentially benefit the most from the immune checkpoint inhibitor (ICI) treatment. Moreover, it seems that better results are seen when an ICI is given as first-line treatment than when an ICI is given in later lines of treatment for advanced TNBC/metastatic TNBC. Recently, pembrolizumab has demonstrated promising results in early-stage TNBC what can lead in near future to its approval in (neo)adjuvant setting. This review summarizes the development and highlights recent advances of the atezolizumab and pembrolizumab in early and advanced/metastatic TNBC.

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Abbreviations

AE:

Adverse event

AKT:

Protein kinase B

Anti-PD-1:

Anti-programmed death receptor 1

ASCO:

American Society of Clinical Oncology

aTNBC:

Advanced triple-negative breast cancer

BC:

Breast cancer

BRCA:

Breast cancer gene

CPS:

Combined positive score

DFS:

Disease-free survival

DLTs:

Dose-limiting toxicities

EFS:

Event-free survival

ER:

Estrogen receptor

FDA:

US Food and Drug Administration

HER2:

Human epidermal growth factor receptor 2

ICI:

Immune checkpoint inhibitor

ICs:

Immune cells

ITT:

Intention-to-treat

LDH:

Lactate dehydrogenase

MEK:

Mitogen-activated protein kinase kinase

mTNBC:

Metastatic triple-negative breast cancer

ORR:

Objective response rate

OS:

Overall survival

pCR:

Pathological complete response

PD-L1:

Programmed cell death ligand 1

PFS:

Progression-free survival

PgR:

Progesterone receptor

TILs:

Tumour-infiltrating lymphocytes

TMB:

Tumour mutational burden

TNBC:

Triple-negative breast cancer

TRAEs:

Treatment-related adverse events

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Dorota Kwapisz—conception and design/idea for the article, acquisition of data/literature search, analysis and interpretation of data, wrote the paper, critically revised the work, approval of the final version of the manuscript.

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Correspondence to Dorota Kwapisz.

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Kwapisz, D. Pembrolizumab and atezolizumab in triple-negative breast cancer. Cancer Immunol Immunother 70, 607–617 (2021). https://doi.org/10.1007/s00262-020-02736-z

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