Abstract:
:An actin-binding protein filamin A connects the actin filament network to cell membrane receptors, and acts as a scaffold for various signaling pathways related to cancer growth and progression. Recently, it has been reported that filamin A is required for efficient regulation of early stages of DNA repair process. Moreover, some in vitro studies showed that the overexpression of filamin A determines resistance to various cytotoxic drugs, including cisplatin. We aimed to analyse the expression of filamin A protein in resected NSCLC (Non Small Cell Lung Cancer) specimens, to investigate the association of the level of filamin A protein expression and other clinicopathological features, and possible relationship between the expression of filamin A and survival outcome in NSCLC patients, treated with platinum-based combination chemotherapy. We performed filamin A protein immunohistochemistry on formalin-fixed and paraffin-embedded (FFPE) tissue sections from 135 NSCLC patients, using EP2405Y antibody against C-terminus of filamin A. Cytoplasmic, membranous and nuclear positivity of filamin A was evaluated semi-quantitatively and correlated with available clinicopathological data. Patients were divided into two groups for survival analysis (I group - patients treated with adjuvant platinum-based chemotherapy, II group - patients with surgical treatment only). We found significant positive correlation between filamin A protein expression and NSCLC stage (r=0.249; p<0,05), presence of lymph node (N)(r=0.205; p<0,05) and distant metastases (M) (r=0.332; P<0.01). Increased filamin A protein expression was significantly related with poor survival outcomes in patients with adjuvant platinum-based chemotherapy: OS (HR=1.005, 95%CI[1.000;1.010], p=0.037), DFS (HR=1.004, 95%CI [1.001:1.008], p=0,017). Multivariate Cox proportional hazards regression analysis also showed that overexpression of filamin A represents an independent risk factor for disease relapse, in addition to tumor size, stage, and metastases status (HR=1.723, 95%CI [1.021:2.909], p<0.05). Thus, filamin A expression might be a new prognostic marker in patients with NSCLC.
journal_name
Neoplasmajournal_title
Neoplasmaauthors
Gachechiladze M,Skarda J,Janikova M,Mgebrishvili G,Kharaishvili G,Kolek V,Grygarkova I,Klein J,Poprachova A,Arabuli M,Kolar Zdoi
10.4149/214_150224N108subject
Has Abstractpub_date
2016-01-01 00:00:00pages
274-81issue
2eissn
0028-2685issn
1338-4317journal_volume
63pub_type
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