Expression pattern of FGFR2, Grb2 and Plc?1 acts as a novel prognostic marker of recurrence recurrence-free survival in lung adenocarcinoma.

ABSTRACT: Lung adenocarcinoma is characterized by complex biology involving alterations at the genomic and protein expression levels. FGFR2 mutation and/or amplification are key drivers of disease progression and drug resistance in lung adenocarcinoma patients. These genetic alterations drive oncogenic downstream signalling due to the deregulated activity of the receptor. We have previously reported that wild type FGFR2 provides a binding site for which two proteins, Grb2 and Plc?1, compete in a concentration-dependent manner. Metastasis and invasion ensue when Plc?1 prevails on the receptor giving rise to oncogenic outcome in the absence of gene mutation/deletion. The effect of this signalling mechanism on FGFR2-driven lung adenocarcinoma has not previously been considered. In this study we show that fluctuation in the combinatorial expression levels of FGFR2, Grb2 and Plc?1 modulates cell invasive properties, tumor formation and is linked to recurrence-free survival in 150 lung adenocarcinoma patients. High levels of expression of FGFR2 and Plc?1 in a low background of Grb2 significantly correlates with poor prognosis. On the other hand, low levels of expression of FGFR2 and Plc?1 in a high background of Grb2 correlates with favourable prognosis. This study defines the expression pattern of FGFR2, Plc?1 and Grb2 as a novel prognostic marker in human lung adenocarcinoma. Thus, consideration of the Grb2 and Plc?1-mediated mechanism of FGFR2 regulation will enhance the therapeutic targeting of aberrant FGFR2 activity to provide the much-needed improvement to the treatment regimen of this high mortality disease.

SUBMITTER: Timsah Z 

PROVIDER: S-EPMC4656736 | biostudies-literature | 2015

REPOSITORIES: biostudies-literature