Cited by 50Breast Cancer Treatment StudiesHER2/EGFR in Cancer ResearchCancer Cells and Metastasis

Identification of synergistic drug combinations using breast cancer patient-derived xenografts

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Turner, Tia H., Alzubi, Mohammad A., Harrell, J. Chuck·2020·Scientific Reports

Abstract

Compared with other breast cancer subtypes, triple-negative breast cancer (TNBC) is associated with relatively poor outcomes due to its metastatic propensity, frequent failure to respond to chemotherapy, and lack of alternative, targeted treatment options, despite decades of major research efforts. Our studies sought to identify promising targeted therapeutic candidates for TNBC through in vitro screening of 1,363 drugs in patient-derived xenograft (PDX) models. Using this approach, we generated a dataset that can be used to assess and compare responses of various breast cancer PDXs to many different drugs. Through a series of further drug screening assays and two-drug combination testing, we identified that the combination of afatinib (epidermal growth factor receptor (EGFR) inhibitor) and YM155 (inhibitor of baculoviral inhibitor of apoptosis repeat-containing 5 (BIRC5; survivin) expression) is synergistically cytotoxic across multiple models of basal-like TNBC and reduces PDX mammary tumor growth in vivo . We found that YM155 reduces EGFR expression in TNBC cells, shedding light on its potential mechanism of synergism with afatinib. Both EGFR and BIRC5 are highly expressed in basal-like PDXs, cell lines, and patients, and high expression of both genes reduces metastasis-free survival, suggesting that co-targeting of these proteins holds promise for potential clinical success in TNBC.

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  • Most in vivo synergy studies simply compare tumor volume at a single day using t test, or use survival analysis to compare time-to-event between groups.

    “Most studies simply compare TV at a single day using t test, or use survival analysis to compare the time-to-event (i.e., time for TV to reach a threshold) between groups (4–6, 23).”

    From Statistical Assessment of Drug Synergy from <i>In Vivo</i> Combination Studies Using Mouse Tumor Models (2023) · cites this paper as [23]

    The Methods (Statistical analyses; page unavailable) report unpaired t tests for comparisons between in vivo treatment groups, and the Figure 8 caption (Results; page unavailable) displays endpoint significance. The paper does not establish that most studies use this approach; it also lists p-values for all measured timepoints. Its survival analysis concerns patients’ metastasis-free survival, not time for tumor volume to reach a threshold. (LLM, conf=0.83)

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Authors
Turner, T. H., Alzubi, M. A., & Harrell, J. C.
Affiliations
Virginia Commonwealth University (US)
Corresponding author
Harrell, J. Chuck
Venue
Scientific Reports
Published
2020-01-30
Volume
10
Issue
1
Pages
1493-1493
ISSN
2045-2322 (ISSN-L)
OpenAlex
W3004587468
Cited by
50
References
92
Citations by year
2026: 2 · 2025: 5 · 2024: 5 · 2023: 12 · 2022: 9 · 2021: 13 · 2020: 4
FWCI
3.26
Type
journal article
Language
en
Open access
Locations
  • Scientific Reports (publishedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion)
Funders
  • U.S. Department of Health & Human Services | NIH | National Cancer Institute (F30CA228393)
  • Susan G. Komen (CCR19608826)
  • Massey Cancer Center, Virginia Commonwealth University
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Cancer Research › Breast Cancer Treatment Studies
  • Health Sciences › Medicine › Oncology › HER2/EGFR in Cancer Research
  • Health Sciences › Medicine › Oncology › Cancer Cells and Metastasis
Keywords
triple-negative breast cancer, drug synergy, patient-derived xenografts, afatinib, YM155, survivin, EGFR inhibition, basal-like breast cancer, targeted therapy, metastasis-free survival, drug repurposing
MeSH terms
Survivin, Afatinib, Animals, Antineoplastic Combined Chemotherapy Protocols, Cell Survival, Dose-Response Relationship, Drug, Drug Screening Assays, Antitumor, Drug Synergism, Female, Humans, Imidazoles, Naphthoquinones, Oligopeptides, Carboplatin, Mice, SCID, Mice, Inbred NOD, Xenograft Model Antitumor Assays, Cell Line, Tumor, Mice, Triple Negative Breast Neoplasms, ErbB Receptors

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