Abstract
Background
Transcatheter arterial chemoembolization (TACE) is a widely used and well-established treatment for hepatocellular carcinoma (HCC). However, TACE loses its therapeutic efficacy when performed repeatedly, a phenomenon termed TACE refractoriness. c-Met is associated with malignant potential and with resistance to anti-tumor therapies in some kinds of cancers.
Aims
The aim of this study is to investigate the clinical impact of TACE on c-Met expression with the aim of understanding the mechanism underlying TACE refractoriness.
Methods
The effect of TACE on the c-Met expression level was investigated in vitro in HCC cell lines, and it was shown that c-Met expression is upregulated in HCC cell lines cultured under hypoxia and/or exposed to chemotherapeutic agents. The in vitro results were validated using 82 clinical samples of HCC with and without preoperative TACE treatment.
Results
c-Met upregulation was observed significantly more frequently in clinical samples of HCC that were treated with preoperative TACE than in samples with no TACE treatment. Increased c-Met expression was significantly associated with poor prognosis. Furthermore, the incidence of c-Met-positive expression was significantly higher in TACE-refractory HCC samples.
Conclusions
TACE treatment upregulates c-Met expression in HCC and the upregulated c-Met expression may be responsible for TACE refractoriness.
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10620_2015_4018_MOESM1_ESM.tif
Induction of less resistance to chemotherapy and hypoxia by c-Met inhibitor in HCC cell lines with increased c-Met expression driven by preculture. The resistance was evaluated by growth-inhibitory assay. The experiment used cells precultured for 72 hours under hypoxic condition and exposure of the chemotherapeutic drugs (CDDP, DXR), which were expected to have increased c-Met expression. The resistance to the drugs (CDDP, DXR) and hypoxia in the cells treated with c-Met inhibitor [SU11274 (+)] was compared to those without c-Met inhibitor [SU11274 (-)]. Data are mean ± SD of triplicates. *p < 0.05 (TIFF 65 kb)
10620_2015_4018_MOESM2_ESM.tif
Immunohistochemical analysis for HGF/c-Met signaling pathway-related protein in representative HCC samples. The panels show a representative case with negative phosphorylated c-Met expression in c-Met-negative case (left upper panel), that with positive phosphorylated c-Met expression in c-Met-positive case (right upper panel), that with negative phosphorylated Akt expression in c-Met-negative case (left lower panel), and that with positive phosphorylated Akt expression in c-Met-positive case (right lower panel). Bar = 100 μm (TIFF 1572 kb)
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Kajihara, J., Tomimaru, Y., Eguchi, H. et al. The Clinical Impact of Transcatheter Arterial Chemoembolization (TACE)-Induced c-Met Upregulation on TACE Refractoriness in Hepatocellular Carcinoma. Dig Dis Sci 61, 1572–1581 (2016). https://doi.org/10.1007/s10620-015-4018-9
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DOI: https://doi.org/10.1007/s10620-015-4018-9