Advanced Breast Cancer: From Biology to Cure

A special issue of Cancers (ISSN 2072-6694). This special issue belongs to the section "Cancer Therapy".

Deadline for manuscript submissions: closed (31 January 2022) | Viewed by 90049

Special Issue Editor


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Guest Editor
Precision Medicine Breast Cancer Unit, Scientific Directorate, Department of Woman and Child Health and Public Health, Fondazione Policlinico Universitario Agostino Gemelli IRCCS, 00168 Rome, Italy
Interests: breast cancer subtype; HER2; triple negative; luminal tumors; breast cancer therapy; target therapy breast cancer

Special Issue Information

Dear Colleagues,

The rapid evolution of our knowledge of breast cancer biology has led in the last 5 years to the better identification of gene expressions and mutations that arise during treatment, and therefore to the development of new target molecules that impact the outcome of disease and survival. Breast cancer represents the most interesting model of biological information, and this aspect is at the basis of the development of clinical trials that include new methods of biomolecular characterization of the tumor—hence the interest of liquid biopsy in advanced disease and the deeper knowledge of the dynamism of the natural and therapeutic history of this neoplasm. This Special Issue aims to show the thrust of current research for the treatment of advanced breast cancer.

Dr. Alessandra Fabi
Guest Editor

Manuscript Submission Information

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Keywords

  • liquid biopsy
  • subtype breast cancer
  • target therapy
  • her2
  • luminal tumors
  • triple negative tumors
  • immunology breast cancer

Published Papers (11 papers)

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Research

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15 pages, 2653 KiB  
Article
Multi-Omics Approach Points to the Importance of Oxylipins Metabolism in Early-Stage Breast Cancer
by Dmitry V. Chistyakov, Mariia V. Guryleva, Elena S. Stepanova, Lyubov M. Makarenkova, Elena V. Ptitsyna, Sergei V. Goriainov, Arina I. Nikolskaya, Alina A. Astakhova, Anna S. Klimenko, Olga A. Bezborodova, Elena A. Rasskazova, Olga G. Potanina, Rimma A. Abramovich, Elena R. Nemtsova and Marina G. Sergeeva
Cancers 2022, 14(8), 2041; https://0-doi-org.brum.beds.ac.uk/10.3390/cancers14082041 - 18 Apr 2022
Cited by 14 | Viewed by 2634
Abstract
The involvement of oxylipins, metabolites of polyunsaturated fatty acids, in cancer pathogenesis was known long ago, but only the development of the high-throughput methods get the opportunity to study oxylipins on a system level. The study aimed to elucidate alterations in oxylipin metabolism [...] Read more.
The involvement of oxylipins, metabolites of polyunsaturated fatty acids, in cancer pathogenesis was known long ago, but only the development of the high-throughput methods get the opportunity to study oxylipins on a system level. The study aimed to elucidate alterations in oxylipin metabolism as characteristics of breast cancer patients. We compared the ultra-high-performance liquid chromatography-mass spectrometry (UPLC-MS/MS) oxylipin profile signatures in the blood plasma of 152 healthy volunteers (HC) and 169 patients with different stages of breast cancer (BC). To integrate lipidomics, transcriptomics, and genomics data, we analyzed a transcriptome of 10 open database datasets obtained from tissues and blood cells of BC patients and SNP data for 33 genes related to oxylipin metabolism. We identified 18 oxylipins, metabolites of omega-3 or omega-6 polyunsaturated fatty acids, that were differentially expressed between BCvsHC patients, including anandamide, prostaglandins and hydroxydocosahexaenoic acids. DEGs analysis of tissue and blood samples from BC patients revealed that 19 genes for oxylipin biosynthesis change their expression level, with CYP2C19, PTGS2, HPGD, and FAAH included in the list of DEGs in the analysis of transcriptomes and the list of SNPs associated with BC. Results allow us to suppose that oxylipin signatures reflect the organism’s level of response to the disease. Our data regarding changes in oxylipins at the system level show that oxylipin profiles can be used to evaluate the early stages of breast cancer. Full article
(This article belongs to the Special Issue Advanced Breast Cancer: From Biology to Cure)
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25 pages, 4791 KiB  
Article
Reduction of Metastasis via Epigenetic Modulation in a Murine Model of Metastatic Triple Negative Breast Cancer (TNBC)
by Jessica L. S. Zylla, Mariah M. Hoffman, Simona Plesselova, Somshuvra Bhattacharya, Kristin Calar, Yohannes Afeworki, Pilar de la Puente, Etienne Z. Gnimpieba, W. Keith Miskimins and Shanta M. Messerli
Cancers 2022, 14(7), 1753; https://0-doi-org.brum.beds.ac.uk/10.3390/cancers14071753 - 30 Mar 2022
Cited by 6 | Viewed by 2457
Abstract
This study investigates the effects of a dual selective Class I histone deacetylase (HDAC)/lysine-specific histone demethylase 1A (LSD1) inhibitor known as 4SC-202 (Domatinostat) on tumor growth and metastasis in a highly metastatic murine model of Triple Negative Breast Cancer (TNBC). 4SC-202 is cytotoxic [...] Read more.
This study investigates the effects of a dual selective Class I histone deacetylase (HDAC)/lysine-specific histone demethylase 1A (LSD1) inhibitor known as 4SC-202 (Domatinostat) on tumor growth and metastasis in a highly metastatic murine model of Triple Negative Breast Cancer (TNBC). 4SC-202 is cytotoxic and cytostatic to the TNBC murine cell line 4T1 and the human TNBC cell line MDA-MB-231; the drug does not kill the normal breast epithelial cell line MCF10A. Furthermore, 4SC-202 reduces cancer cell migration. In vivo studies conducted in the syngeneic 4T1 model, which closely mimics human TNBC in terms of sites of metastasis, reveal reduced tumor burden and lung metastasis. The mechanism of action of 4SC-202 may involve effects on cancer stem cells (CSC) which can self-renew and form metastatic lesions. Approximately 5% of the total 4T1 cell population grown in three-dimensional scaffolds had a distinct CD44high/CD24low CSC profile which decreased after treatment. Bulk transcriptome (RNA) sequencing analyses of 4T1 tumors reveal changes in metastasis-related pathways in 4SC-202-treated tumors, including changes to expression levels of genes implicated in cell migration and cell motility. In summary, 4SC-202 treatment of tumors from a highly metastatic murine model of TNBC reduces metastasis and warrants further preclinical studies. Full article
(This article belongs to the Special Issue Advanced Breast Cancer: From Biology to Cure)
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12 pages, 1578 KiB  
Article
Diagnostic Accuracy of Contrast-Enhanced, Spectral Mammography (CESM) and 3T Magnetic Resonance Compared to Full-Field Digital Mammography plus Ultrasound in Breast Lesions: Results of a (Pilot) Open-Label, Single-Centre Prospective Study
by Francesca Romana Ferranti, Federica Vasselli, Maddalena Barba, Francesca Sperati, Irene Terrenato, Franco Graziano, Patrizia Vici, Claudio Botti and Antonello Vidiri
Cancers 2022, 14(5), 1351; https://0-doi-org.brum.beds.ac.uk/10.3390/cancers14051351 - 07 Mar 2022
Cited by 3 | Viewed by 4832
Abstract
Introduction: To assess the diagnostic accuracy of CESM and 3T MRI compared to full-field digital mammography (FFDM), plus US, in the evaluation of advanced breast lesions. Materials and Methods: Consenting women with suspicious findings underwent FFDM, US, CESM and 3T MRI. Breast lesions [...] Read more.
Introduction: To assess the diagnostic accuracy of CESM and 3T MRI compared to full-field digital mammography (FFDM), plus US, in the evaluation of advanced breast lesions. Materials and Methods: Consenting women with suspicious findings underwent FFDM, US, CESM and 3T MRI. Breast lesions were histologically assessed, with histology being the gold standard. Two experienced breast radiologists, blinded to cancer status, read the images. Diagnostic accuracy of (1) CESM as an adjunct to FFDM and US, and (2) 3T MRI as an adjunct to CESM compared to FFDM and US, was assessed. Measures of accuracy were sensitivity (Se), specificity (Sp), positive predictive value (PPV) and negative predictive value (NPV). Results: There were 118 patients included along with 142 histologically characterized lesions. K agreement values were 0.69, 0.68, 0.63 and 0.56 for concordance between the gold standard and FFDM, FFDM + US, CESM and MRI, respectively (p < 0.001, for all). K concordance for CESM was 0.81 with FFDM + US and 0.73 with MRI (p value < 0.001 for all). Conclusions: CESM may represent a valuable alternative and/or an integrating technique to MRI in the evaluation of breast cancer patients. Full article
(This article belongs to the Special Issue Advanced Breast Cancer: From Biology to Cure)
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18 pages, 5438 KiB  
Article
BHMPS Inhibits Breast Cancer Migration and Invasion by Disrupting Rab27a-Mediated EGFR and Fibronectin Secretion
by Jeong-In Park, Kyung-Hee Song, Seong-Mook Kang, Jeeyong Lee, Seong-Jun Cho, Hyun Kyung Choi, Jiyeon Ahn, Jong-Kuk Park, Jaesung Kim, Sang-Gu Hwang, Dae-Seog Lim, Joon Kim, Seung-Youn Jung and Jie-Young Song
Cancers 2022, 14(2), 373; https://0-doi-org.brum.beds.ac.uk/10.3390/cancers14020373 - 12 Jan 2022
Cited by 5 | Viewed by 1911
Abstract
Our previous work demonstrated that (E)-N-benzyl-6-(2-(3, 4-dihydroxybenzylidene) hydrazinyl)-N-methylpyridine-3-sulfonamide (BHMPS), a novel synthetic inhibitor of Rab27aSlp(s) interaction, suppresses tumor cell invasion and metastasis. Here, we aimed to further investigate the mechanisms of action and biological significance of BHMPS. [...] Read more.
Our previous work demonstrated that (E)-N-benzyl-6-(2-(3, 4-dihydroxybenzylidene) hydrazinyl)-N-methylpyridine-3-sulfonamide (BHMPS), a novel synthetic inhibitor of Rab27aSlp(s) interaction, suppresses tumor cell invasion and metastasis. Here, we aimed to further investigate the mechanisms of action and biological significance of BHMPS. BHMPS decreased the expression of epithelial-mesenchymal transition transcription factors through inhibition of focal adhesion kinase and c-Jun N-terminal kinase activation, thereby reducing the migration and invasion of breast cancer. Additionally, knockdown of Rab27a inhibited tumor migration, with changes in related signaling molecules, whereas overexpression of Rab27a reversed this phenomenon. BHMPS effectively prevented the interaction of Rab27a and its effector Slp4, which was verified by co-localization, immunoprecipitation, and in situ proximity ligation assays. BHMPS decreased the secretion of epidermal growth factor receptor and fibronectin by interfering with vesicle trafficking, as indicated by increased perinuclear accumulation of CD63-positive vesicles. Moreover, administration of BHMPS suppressed tumor growth in Rab27a-overexpressing MDA-MB-231 xenograft mice. These findings suggest that BHMPS may be a promising candidate for attenuating tumor migration and invasion by blocking Rab27a-mediated exocytosis. Full article
(This article belongs to the Special Issue Advanced Breast Cancer: From Biology to Cure)
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11 pages, 832 KiB  
Article
Assessment of Resistance Mechanisms and Clinical Implications in Patients with KRAS Mutated-Metastatic Breast Cancer and Resistance to CDK4/6 Inhibitors
by Lucrezia Raimondi, Filippo Maria Raimondi, Marta Pietranera, Arianna Di Rocco, Laura Di Benedetto, Evelina Miele, Rachele Lazzeroni, Giuseppe Cimino and Gian Paolo Spinelli
Cancers 2021, 13(8), 1928; https://0-doi-org.brum.beds.ac.uk/10.3390/cancers13081928 - 16 Apr 2021
Cited by 12 | Viewed by 2478
Abstract
Despite therapeutic improvements, resistance to palbociclib is a growing clinical challenge which is poorly understood. This study was conducted in order to understand the molecular mechanisms of resistance to palbociclib, and to identify biomarkers to predict who will take advantage from cyclin-dependent kinase [...] Read more.
Despite therapeutic improvements, resistance to palbociclib is a growing clinical challenge which is poorly understood. This study was conducted in order to understand the molecular mechanisms of resistance to palbociclib, and to identify biomarkers to predict who will take advantage from cyclin-dependent kinase 4/6 inhibitors (CDK4/6i). A total of about a thousand blood samples were collected from 106 patients with hormone receptor positive (HR+) human epidermal growth factor receptor 2 (HER2) negative metastatic breast cancer who received palbociclib in combination with fulvestrant as the first-line metastatic therapy enrolled in this study. The genotyping of their plasma cell-free DNA was studied, including serial plasma samples. Collectively, our findings identify the appearance of KRAS mutations leading to palbociclib resistance acquisition within 6 months, and provide critical information for the prediction of therapeutic responses in metastatic breast cancer. By monitoring KRAS status through liquid biopsy, we could predict who will take advantage from the combination of palbociclib and fulvestrant, offering highly-individualized treatment plans, thus ensuring the best patient quality of life. Full article
(This article belongs to the Special Issue Advanced Breast Cancer: From Biology to Cure)
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18 pages, 3463 KiB  
Article
Ginsenoside Rh1 Induces MCF-7 Cell Apoptosis and Autophagic Cell Death through ROS-Mediated Akt Signaling
by Diem Thi Ngoc Huynh, Yujin Jin, Chang-Seon Myung and Kyung-Sun Heo
Cancers 2021, 13(8), 1892; https://0-doi-org.brum.beds.ac.uk/10.3390/cancers13081892 - 15 Apr 2021
Cited by 29 | Viewed by 3807
Abstract
Breast cancer (BC) is the leading cause of cancer-related deaths among women worldwide. Ginsenosides exhibit anticancer activity against various cancer cells. However, the effects of ginsenoside Rh1 on BC and the underlying mechanisms remain unknown. Here, we investigated the anticancer effects of Rh1 [...] Read more.
Breast cancer (BC) is the leading cause of cancer-related deaths among women worldwide. Ginsenosides exhibit anticancer activity against various cancer cells. However, the effects of ginsenoside Rh1 on BC and the underlying mechanisms remain unknown. Here, we investigated the anticancer effects of Rh1 on human BC MCF-7 and HCC1428 cells and the underlying signaling pathways. The anticancer effects of Rh1 in vitro were evaluated using sulforhodamine B (SRB), 3-(4, 5-dimethylthiazole-2-yl)-2, 5-diphenyltetrazolium bromide (MTT), clonogenic assay, propidium iodide (PI)/Hoechst staining, Western blotting, flow cytometry, and immunofluorescence analysis. The in vivo effects of Rh1 were determined using a xenograft model via hematoxylin and eosin and the immunohistochemistry staining of tumor tissues. We found that Rh1 exerted cytotoxicity in the cells by increasing cell apoptosis, autophagy, and cell cycle arrest. These effects were further enhanced by a phosphatidylinositol 3-kinase (PI3K) inhibitor but were rescued by the inhibition of reactive oxygen species (ROS). Moreover, enhanced ROS generation by Rh1 inhibited the activation of the PI3K/Akt pathway. Consistently, Rh1 treatment significantly reduced tumor growth in vivo and increased the ROS production and protein expression of LC3B and cleaved caspase-3 but decreased the phosphorylation of Akt and retinoblastoma (Rb) in tumor tissues. Taken together, Rh1 exerted a potential anticancer effect on BC cells by inducing cell cycle arrest, apoptosis, and autophagy via inhibition of the ROS-mediated PI3K/Akt pathway. Full article
(This article belongs to the Special Issue Advanced Breast Cancer: From Biology to Cure)
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Review

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21 pages, 692 KiB  
Review
PI3K Inhibitors in Advanced Breast Cancer: The Past, The Present, New Challenges and Future Perspectives
by Paola Fuso, Margherita Muratore, Tatiana D’Angelo, Ida Paris, Luisa Carbognin, Giordana Tiberi, Francesco Pavese, Simona Duranti, Armando Orlandi, Giampaolo Tortora, Giovanni Scambia and Alessandra Fabi
Cancers 2022, 14(9), 2161; https://0-doi-org.brum.beds.ac.uk/10.3390/cancers14092161 - 26 Apr 2022
Cited by 16 | Viewed by 3716
Abstract
Breast cancer is the leading cause of death in the female population and despite significant efforts made in diagnostic approaches and treatment strategies adopted for advanced breast cancer, the disease still remains incurable. Therefore, development of more effective systemic treatments constitutes a crucial [...] Read more.
Breast cancer is the leading cause of death in the female population and despite significant efforts made in diagnostic approaches and treatment strategies adopted for advanced breast cancer, the disease still remains incurable. Therefore, development of more effective systemic treatments constitutes a crucial need. Recently, several clinical trials were performed to find innovative predictive biomarkers and to improve the outcome of metastatic breast cancer through innovative therapeutic algorithms. In the pathogenesis of breast cancer, the phosphatidylinositol 3-kinase (PI3K)-protein kinase B (PKB/AKT)-mammalian target of rapamycin (mTOR) axis is a key regulator of cell proliferation, growth, survival, metabolism, and motility, making it an interest and therapeutic target. Nevertheless, the PI3K/AKT/mTOR cascade includes a complex network of biological events, needing more sophisticated approaches for their use in cancer treatment. In this review, we described the rationale for targeting the PI3K pathway, the development of PI3K inhibitors and the future treatment directions of different breast cancer subtypes in the metastatic setting. Full article
(This article belongs to the Special Issue Advanced Breast Cancer: From Biology to Cure)
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17 pages, 4051 KiB  
Review
Radiotherapy for HER 2 Positive Brain Metastases: Urgent Need for a Paradigm Shift
by Edy Ippolito, Sonia Silipigni, Paolo Matteucci, Carlo Greco, Sofia Carrafiello, Vincenzo Palumbo, Claudia Tacconi, Claudia Talocco, Michele Fiore, Rolando Maria D’Angelillo and Sara Ramella
Cancers 2022, 14(6), 1514; https://0-doi-org.brum.beds.ac.uk/10.3390/cancers14061514 - 15 Mar 2022
Cited by 6 | Viewed by 2787
Abstract
Brain metastases (BMs) are common among patients affected by HER2+ metastatic breast cancer (>30%). The management of BMs is usually multimodal, including surgery, radiotherapy, systemic therapy and palliative care. Standard brain radiotherapy (RT) includes the use of stereotactic radiotherapy (SRT) for limited disease [...] Read more.
Brain metastases (BMs) are common among patients affected by HER2+ metastatic breast cancer (>30%). The management of BMs is usually multimodal, including surgery, radiotherapy, systemic therapy and palliative care. Standard brain radiotherapy (RT) includes the use of stereotactic radiotherapy (SRT) for limited disease and whole brain radiotherapy (WBRT) for extensive disease. The latter is an effective palliative treatment but has a reduced effect on brain local control and BM overall survival, as it is also associated with severe neurocognitive sequelae. Recent advances both in radiation therapy and systemic treatment may change the paradigm in this subset of patients who can experience long survival notwithstanding BMs. In fact, in recent studies, SRT for multiple BM sites (>4) has shown similar efficacy when compared to irradiation of a limited number of lesions (one to three) without increasing toxicity. These findings, in addition to the introduction of new drugs with recognized intracranial activity, may further limit the use of WBRT in favor of SRT, which should be employed for treatment of both multiple-site BMs and for oligo-progressive brain disease. This review summarizes the supporting literature and highlights the need for optimizing combinations of the available treatments in this setting, with a particular focus on radiation therapy. Full article
(This article belongs to the Special Issue Advanced Breast Cancer: From Biology to Cure)
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17 pages, 818 KiB  
Review
Breast Cancer Drug Approvals Issued by EMA: A Review of Clinical Trials
by Simona Duranti, Alessandra Fabi, Marco Filetti, Rosa Falcone, Pasquale Lombardi, Gennaro Daniele, Gianluca Franceschini, Luisa Carbognin, Antonella Palazzo, Giorgia Garganese, Ida Paris, Giovanni Scambia and Antonella Pietragalla
Cancers 2021, 13(20), 5198; https://0-doi-org.brum.beds.ac.uk/10.3390/cancers13205198 - 16 Oct 2021
Cited by 10 | Viewed by 2438
Abstract
Breast cancer represents the first cause of cancer worldwide and the leading cause of cancer mortality for women. Therefore, new therapies are needed to improve the prognosis of women diagnosed with this disease. In this review, we summarize the new drug indications for [...] Read more.
Breast cancer represents the first cause of cancer worldwide and the leading cause of cancer mortality for women. Therefore, new therapies are needed to improve the prognosis of women diagnosed with this disease. In this review, we summarize the new drug indications for the treatment of breast cancer approved by European Medicines Agency between January 2015 and June 2021. In particular, we analyzed the clinical trials results leading to approvals and their update (when available), according to setting (localized and locally advanced or metastatic) and clinical features (hormone receptor positive, HER2 positive, triple negative, BRCA 1/2 mutation). The aim of this paper is to describe the clinical benefit obtained with the new indications. Full article
(This article belongs to the Special Issue Advanced Breast Cancer: From Biology to Cure)
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30 pages, 507 KiB  
Review
Breast Cancer—Epidemiology, Risk Factors, Classification, Prognostic Markers, and Current Treatment Strategies—An Updated Review
by Sergiusz Łukasiewicz, Marcin Czeczelewski, Alicja Forma, Jacek Baj, Robert Sitarz and Andrzej Stanisławek
Cancers 2021, 13(17), 4287; https://0-doi-org.brum.beds.ac.uk/10.3390/cancers13174287 - 25 Aug 2021
Cited by 419 | Viewed by 54138
Abstract
Breast cancer (BC) is the most frequently diagnosed cancer in women worldwide with more than 2 million new cases in 2020. Its incidence and death rates have increased over the last three decades due to the change in risk factor profiles, better cancer [...] Read more.
Breast cancer (BC) is the most frequently diagnosed cancer in women worldwide with more than 2 million new cases in 2020. Its incidence and death rates have increased over the last three decades due to the change in risk factor profiles, better cancer registration, and cancer detection. The number of risk factors of BC is significant and includes both the modifiable factors and non-modifiable factors. Currently, about 80% of patients with BC are individuals aged >50. Survival depends on both stage and molecular subtype. Invasive BCs comprise wide spectrum tumors that show a variation concerning their clinical presentation, behavior, and morphology. Based on mRNA gene expression levels, BC can be divided into molecular subtypes (Luminal A, Luminal B, HER2-enriched, and basal-like). The molecular subtypes provide insights into new treatment strategies and patient stratifications that impact the management of BC patients. The eighth edition of TNM classification outlines a new staging system for BC that, in addition to anatomical features, acknowledges biological factors. Treatment of breast cancer is complex and involves a combination of different modalities including surgery, radiotherapy, chemotherapy, hormonal therapy, or biological therapies delivered in diverse sequences. Full article
(This article belongs to the Special Issue Advanced Breast Cancer: From Biology to Cure)
20 pages, 1086 KiB  
Review
CDK4/6 Inhibitor Treatments in Patients with Hormone Receptor Positive, Her2 Negative Advanced Breast Cancer: Potential Molecular Mechanisms, Clinical Implications and Future Perspectives
by Michela Roberto, Antonio Astone, Andrea Botticelli, Luisa Carbognin, Alessandra Cassano, Giuliana D’Auria, Agnese Fabbri, Alessandra Fabi, Teresa Gamucci, Eriseld Krasniqi, Mauro Minelli, Armando Orlandi, Francesco Pantano, Ida Paris, Laura Pizzuti, Ilaria Portarena, Nello Salesi, Simone Scagnoli, Paola Scavina, Giuseppe Tonini, Patrizia Vici and Paolo Marchettiadd Show full author list remove Hide full author list
Cancers 2021, 13(2), 332; https://0-doi-org.brum.beds.ac.uk/10.3390/cancers13020332 - 18 Jan 2021
Cited by 40 | Viewed by 7100
Abstract
Hormone receptor (HR)-positive, human epidermal growth factor receptor 2 (HER2)-negative breast cancer is the most common breast cancer subtype, and endocrine therapy (ET) remains its therapeutic backbone. Although anti-estrogen therapies are usually effective initially, approximately 50% of HR+ patients develop resistance to ET [...] Read more.
Hormone receptor (HR)-positive, human epidermal growth factor receptor 2 (HER2)-negative breast cancer is the most common breast cancer subtype, and endocrine therapy (ET) remains its therapeutic backbone. Although anti-estrogen therapies are usually effective initially, approximately 50% of HR+ patients develop resistance to ET within their lifetime, ultimately leading to disease recurrence and limited clinical benefit. The recent addition of cyclin-dependent kinase 4 (CDK4) and CDK6 inhibitors (palbociclib, ribociclib, abemaciclib) to ET have remarkably improved the outcome of patients with HR+ advanced breast cancer (ABC) compared with anti-estrogens alone, by targeting the cell-cycle machinery and overcoming some aspects of endocrine resistance. However, which patients are the better candidates for these drugs, which are the main characteristics for a better selection of patients or if there are predictive biomarkers of response, is still unknown. In this review we reported the mechanism of action of CDK4/6 inhibitors as well as their potential mechanism of resistance, their implications in clinical practice and the forthcoming strategies to enhance their efficacy in improving survival and quality of life of patients affected with HR+, HER2−, ABC. Full article
(This article belongs to the Special Issue Advanced Breast Cancer: From Biology to Cure)
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