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Article . 2013
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International Journal of Cancer
Article . 2013 . Peer-reviewed
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Expression and clinical relevance of MET and ALK in Ewing sarcomas

Authors: Fleuren, E.D.G.; Roeffen, M.H.S.; Roeffen, M.H.S.; Leenders, W.P.J.; Flucke, U.E.; Vlenterie, M.; Schreuder, H.W.B.; +4 Authors

Expression and clinical relevance of MET and ALK in Ewing sarcomas

Abstract

Because novel therapeutic options are limited in Ewing sarcomas (ES), we investigated the expression, genetic aberrations and clinical relevance of MET and anaplastic lymphoma kinase (ALK) in ES and determined the relevance of targeting these receptors. MET and ALK protein expression was determined immunohistochemically in 31 (50 samples) and 36 (59 samples) ES patients, respectively. Samples included primary tumors, postchemotherapy resections, metastases and relapses. MET and ALK RTK domains were sequenced in respectively 33 and 32 tumors. Five ES cell lines were treated in vitro with the MET/ALK‐inhibitor crizotinib, the ALK‐inhibitor NVP‐TAE684 or the MET‐inhibitor cabozantinib and analyzed by MTT assays. Modest to high MET and ALK expression was detected in the majority of ES (86 and 69%, respectively). ALK expression was significantly lower in postchemotherapy resections compared to paired untreated primary tumors (p = 0.031, z = −2.310, n = 11). In primary tumors (n = 20), membranous MET expression significantly correlated with a poor overall survival (OS) (60 vs. 197 months, p = 0.014). There was a trend toward a poor event‐free survival (67 vs. 111 months, p = 0.078) and OS (88 vs. 128 months, p = 0.074) in patients with highest ALK levels (n = 29). ALK or MET RTK domain aberrations were demonstrated in 5/32 (16%) and 3/33 (9%) tumors, respectively. Crizotinib (IC50 1.22–3.59 μmol/L), NVP‐TAE684 (IC50 0.15–0.79 μmol/L) and cabozantinib (IC50 2.69–8.27 μmol/L) affected ES cell viability in vitro. Altogether, our data suggest that MET and ALK are potential novel therapeutic targets in ES and targeting these receptors may be of great interest to rationally design future studies in ES.

Keywords

Adult, Male, Adolescent, Pyridines, ONCOL 3: Translational research NCMLS 3: Tissue engineering and pathology, Inhibitory Concentration 50, Crizotinib, Medical Imaging - Radboud University Medical Center, NCEBP 10: Human Movement & Fatigue ONCOL 4: Quality of Care, Humans, Anaplastic Lymphoma Kinase, Anilides, Neoplasm Metastasis, Child, Chromosome Aberrations, ONCOL 3: Translational research NCMLS 2: Immune Regulation, Gene Expression Profiling, ONCOL 2: Age-related aspects of cancer NCEBP 4: Quality of hospital and integrated care, Middle Aged, Proto-Oncogene Proteins c-met, Immunohistochemistry, Gene Expression Regulation, Neoplastic, ONCOL 3: Translational research, Child, Preschool, Pyrazoles, Female

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    popularity
    This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
    Top 10%
    influence
    This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
    Top 10%
    impulse
    This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
    Top 10%
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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
53
Top 10%
Top 10%
Top 10%
Green
bronze