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Molecular Classification of Breast Cancer

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Management of Breast Diseases
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Abstract

Breast cancer is a heterogeneous disease in terms of histology, therapeutic response, dissemination patterns to distant sites, and patient outcomes. To date, molecular characterization studies have started to elucidate the biology behind this heterogeneity. For example, 15 years of studies based on global gene expression analyses have helped identify 4 main intrinsic molecular subtypes of breast cancer (Luminal A, Luminal B, HER2-enriched, and basal-like). More recently, The Cancer Genome Atlas (TCGA) breast cancer project has further characterized this disease from a molecular perspective and provided important insights. In this chapter, we will describe the main molecular features of the intrinsic molecular subtypes and discuss how the combination of standard clinical–pathological markers with the information provided by these molecular entities might help further understand the biological complexity of this disease, increase the efficacy of current and novel therapies, and ultimately improve outcomes for breast cancer patients.

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Abbreviations

ER:

Estrogen receptor

PR:

Progesterone receptor

HER2:

Human epidermal growth factor 2

IHC:

Immunohistochemistry

5NP:

5 Negative Profile

TN:

Triple-negative

pCR:

Pathologic complete response

qRT-PCR:

Quantitative reverse transcriptase polymerase chain reaction

CNAs:

Copy number aberrations

CDH1:

E-cadherin

ILC:

Invasive lobular carcinoma

IDC:

Ductal

TCGA:

The Cancer Genome Atlas

METABRIC:

Molecular Taxonomy of Breast Cancer International Consortium

BL1:

Basal-like 1

BL2:

Basal-like 2

IM:

Immunomodulatory

M:

Mesenchymal

MSL:

Mesenchymal stem-like

LAR:

Luminal androgen receptor

BLIS:

Basal-like immune-suppressed

BLIA:

Basal-like immune-activated

IntClust:

Integrative cluster

EMT:

Epithelial-to-mesenchymal

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Vidal, M., Paré, L., Prat, A. (2016). Molecular Classification of Breast Cancer. In: Jatoi, I., Rody, A. (eds) Management of Breast Diseases. Springer, Cham. https://doi.org/10.1007/978-3-319-46356-8_12

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