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2015 ; 2015
(ä): 192406
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MET Expression in Primary and Metastatic Clear Cell Renal Cell Carcinoma:
Implications of Correlative Biomarker Assessment to MET Pathway Inhibitors
#MMPMID26448928
Shuch B
; Falbo R
; Parisi F
; Adeniran A
; Kluger Y
; Kluger HM
; Jilaveanu LB
Biomed Res Int
2015[]; 2015
(ä): 192406
PMID26448928
show ga
AIMS: Inhibitors of the MET pathway hold promise in the treatment for metastatic
kidney cancer. Assessment of predictive biomarkers may be necessary for
appropriate patient selection. Understanding MET expression in metastases and the
correlation to the primary site is important, as distant tissue is not always
available. METHODS AND RESULTS: MET immunofluorescence was performed using
automated quantitative analysis and a tissue microarray containing matched
nephrectomy and distant metastatic sites from 34 patients with clear cell renal
cell carcinoma. Correlations between MET expressions in matched primary and
metastatic sites and the extent of heterogeneity were calculated. The mean
expression of MET was not significantly different between primary tumors when
compared to metastases (P = 0.1). MET expression weakly correlated between
primary and matched metastatic sites (R = 0.5) and a number of cases exhibited
very high levels of discordance between these tumors. Heterogeneity within
nephrectomy specimens compared to the paired metastatic tissues was not
significantly different (P = 0.39). CONCLUSIONS: We found that MET expression is
not significantly different in primary tumors than metastatic sites and only
weakly correlates between matched sites. Moderate concordance of MET expression
and significant expression heterogeneity may be a barrier to the development of
predictive biomarkers using MET targeting agents.