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Erschienen in: Targeted Oncology 2/2019

26.02.2019 | Original Research Article

Synergistic Growth Inhibition by Afatinib and Trametinib in Preclinical Oral Squamous Cell Carcinoma Models

verfasst von: Pei San Yee, Nur Syafinaz Zainal, Chai Phei Gan, Bernard K. B. Lee, Kein Seong Mun, Mannil Thomas Abraham, Siti Mazlipah Ismail, Zainal Ariff Abdul Rahman, Vyomesh Patel, Sok Ching Cheong

Erschienen in: Targeted Oncology | Ausgabe 2/2019

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Abstract

Background

Given that aberrant activation of epidermal growth factor receptor family receptors (ErbB) is a common event in oral squamous cell carcinoma, and that high expression of these receptor proteins is often associated with poor prognosis, this rationalizes the approach of targeting ErbB signaling pathways to improve the survival of patients with oral squamous cell carcinoma. However, monotherapy with the ErbB blocker afatinib has shown limited survival benefits.

Objectives

This study was performed to identify mechanisms of afatinib resistance and to explore potential afatinib-based combination treatments with other targeted inhibitors in oral squamous cell carcinoma.

Methods

We determined the anti-proliferative effects of afatinib on a panel of oral squamous cell carcinoma cell lines using a crystal violet-growth inhibition assay, click-iT 5-ethynyl-2′-deoxyuridine staining, and cell-cycle analysis. Biochemical assays were performed to study the underlying mechanism of drug treatment as a single agent or in combination with the MEK inhibitor trametinib. We further evaluated and compared the anti-tumor effects of single agent and combined treatment by using oral squamous cell carcinoma xenograft models.

Results

In this study, we showed that afatinib inhibited oral squamous cell carcinoma cell proliferation via cell-cycle arrest at the G0/G1 phase, and inhibited tumor growth in xenograft mouse models. Interestingly, we demonstrated reactivation of the mitogen-activated protein kinase (ERK1/2) pathway in vitro, which possibly reduced the effects of ErbB inhibition. Concomitant treatment of oral squamous cell carcinoma cells with afatinib and trametinib synergized the anti-tumor effects in oral squamous cell carcinoma-bearing mouse models.

Conclusions

Our findings provide insight into the molecular mechanism of resistance to afatinib and support further clinical evaluation into the combination of afatinib and MEK inhibition in the treatment of oral squamous cell carcinoma.
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Metadaten
Titel
Synergistic Growth Inhibition by Afatinib and Trametinib in Preclinical Oral Squamous Cell Carcinoma Models
verfasst von
Pei San Yee
Nur Syafinaz Zainal
Chai Phei Gan
Bernard K. B. Lee
Kein Seong Mun
Mannil Thomas Abraham
Siti Mazlipah Ismail
Zainal Ariff Abdul Rahman
Vyomesh Patel
Sok Ching Cheong
Publikationsdatum
26.02.2019
Verlag
Springer International Publishing
Erschienen in
Targeted Oncology / Ausgabe 2/2019
Print ISSN: 1776-2596
Elektronische ISSN: 1776-260X
DOI
https://doi.org/10.1007/s11523-019-00626-8

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