Sequence-dependent cross-resistance of combined radiotherapy plus BRAF V600E inhibition in melanoma

Introduction - Treatment of patients with metastatic melanoma is hampered by drug-resistance and often requires combination with radiotherapy as last-resort option. However, also after radiotherapy, clinical relapses are common. - Methods & results - Our preclinical models indicated a higher rat...

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1. Verfasser: Shannan, Batool (VerfasserIn)
Weitere Verfasser: Utikal, Jochen (BerichterstatterIn)
Dokumenttyp: Article (Journal)
Sprache:Englisch
Veröffentlicht: 2 February 2019
In: European journal of cancer
Year: 2019, Jahrgang: 109, Pages: 137-153
ISSN:1879-0852
DOI:10.1016/j.ejca.2018.12.024
Online-Zugang:Verlag, Volltext: https://doi.org/10.1016/j.ejca.2018.12.024
Verlag, Volltext: http://www.sciencedirect.com/science/article/pii/S0959804919300012
Volltext
Verfasserangaben:B. Shannan, J. Matschke, H. Chauvistré, F. Vogel, D. Klein, F. Meier, D. Westphal, J. Bruns, R. Rauschenberg, J. Utikal, A. Forschner, C. Berking, P. Terheyden, E. Dabrowski, R. Gutzmer, D. Rafei-Shamsabadi, F. Meiss, L. Heinzerling, L. Zimmer, Elisabeth Livingstone, Renáta Váraljai, A. Hoewner, S. Horn, J. Klode, M. Stuschke, B. Scheffler, A. Marchetto, G. Sannino, T.G.P. Grünewald, D. Schadendorf, V. Jendrossek, A. Roesch

MARC

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520 |a Introduction - Treatment of patients with metastatic melanoma is hampered by drug-resistance and often requires combination with radiotherapy as last-resort option. However, also after radiotherapy, clinical relapses are common. - Methods & results - Our preclinical models indicated a higher rate of tumour relapse when melanoma cells were first treated with BRAFV600E inhibition (BRAFi) followed by radiotherapy as compared to the reverse sequence. Accordingly, retrospective follow-up data from 65 stage-IV melanoma patients with irradiated melanoma brain metastases confirmed a shortened duration of local response of mitogen-activated protein kinase (MAPK)-inhibitor-pretreated compared with MAPK-inhibitor-naïve intracranial metastases. On the molecular level, we identified JARID1B/KDM5B as a cellular marker for cross-resistance between BRAFi and radiotherapy. JARID1Bhigh cells appeared more frequently under upfront BRAFi as compared with upfront radiation. JARID1B favours cell survival by transcriptional regulation of genes controlling cell cycle, DNA repair and cell death. - Conclusion - The level of cross-resistance between combined MAPK inhibition and radiotherapy is dependent on the treatment sequence. JARID1B may represent a novel therapy-overarching resistance marker. 
650 4 |a Cross-resistance 
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