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Published in: Cancer Chemotherapy and Pharmacology 2/2017

01-02-2017 | Original Article

Reduced proliferation and colony formation of head and neck squamous cell carcinoma (HNSCC) after dual targeting of EGFR and hedgehog pathways

Authors: Hannes Liebig, Georg Günther, Marlen Kolb, Christian Mozet, Andreas Boehm, Andreas Dietz, Gunnar Wichmann

Published in: Cancer Chemotherapy and Pharmacology | Issue 2/2017

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Abstract

Purpose

The hedgehog signalling pathway (Hh) is frequently active in head and neck squamous cell carcinoma (HNSCC). Overexpressed Hh associates with poor prognosis. The Hh inhibitor vismodegib targets smoothened, and based on molecular data, may prevent resistance to EGFR targeting.

Methods

To elucidate potential roles of vismodegib in HNSCC therapy, its sole effects and those combined with cisplatin, docetaxel, and cetuximab on HNSCC cell lines were assessed by MTT metabolisation and BrdU incorporation. Colony formation (CF) of primary HNSCC cells was studied utilizing the FLAVINO-protocol. Combinatory effects were analysed regarding antagonism, additivity or synergism. Associations between the ex vivo detected mode of action of vismodegib with other treatments related to patient characteristics were assessed and progression-free survival (PFS) in patient groups compared using Kaplan–Meier curves.

Results

Vismodegib suppressed BrdU incorporation significantly stronger than MTT turnover; CF was significantly inhibited at ≥20 µM vismodegib while concentrations <20 µM acted hormetic. Combining 20 µM vismodegib plus docetaxel (T), cisplatin (P), and cetuximab (E), additively enhanced anti-tumoral activity in HNSCC samples from patients with superior PFS highlighting a potential role for ex-vivo testing of this combination for use as a prognostic classifier.

Conclusion

We provide ex-vivo evidence for vismodegib’s potential in HNSCC therapies, especially if combined with cetuximab, cisplatin and docetaxel.
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Metadata
Title
Reduced proliferation and colony formation of head and neck squamous cell carcinoma (HNSCC) after dual targeting of EGFR and hedgehog pathways
Authors
Hannes Liebig
Georg Günther
Marlen Kolb
Christian Mozet
Andreas Boehm
Andreas Dietz
Gunnar Wichmann
Publication date
01-02-2017
Publisher
Springer Berlin Heidelberg
Published in
Cancer Chemotherapy and Pharmacology / Issue 2/2017
Print ISSN: 0344-5704
Electronic ISSN: 1432-0843
DOI
https://doi.org/10.1007/s00280-017-3239-3

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