Importin-α1 as a novel prognostic target for hepatocellular carcinoma.

Abstract:

BACKGROUND:Perturbations in the nuclear microenvironment, including transport systems, play a critical role in malignant progression, but the nuclear import abnormalities remain unclear in hepatocarcinogenesis. We analyzed the role of importin in hepatocellular carcinoma (HCC). METHODS:Gene expression profiling of the importin family was performed in HCC tissues. The significance of importin protein expression was analyzed in vitro as well as clinicopathologically. RESULTS:According to the microarray profiles, the importin-α1 was dominantly overexpressed in HCC tissues as compared to the adjacent noncancerous tissues. By means of human HCC cell lines, a knockdown of importin-α1 by its siRNA greatly reduced cellular proliferation by 15.2-26.6% (P < 0.005). Immunohistochemical analysis on tissue samples demonstrated cancer-specific overexpression in 36.3% of HCCs. The overexpression of importin-α1 was correlated statistically with high levels of alfa-fetoprotein ( P = 0.0017), the tumor number (P = 0.0116), histological dedifferentiation (P = 0.0054), tumor morphology (P = 0.0433), portal vein invasion (P = 0.0007), hepatic vein invasion (P = 0.0081), Fc (P = 0.0367), Fc-inf (P = 0.0122), and the tumor, node, metastasis stage (P = 0.0026); this resulted in a significantly poorer prognosis in both overall survival (P = 0.0164) and recurrence-free survival (P = 0.0101). Multivariate analysis of recurrence-free survival revealed importin-α1 expression to be a statistically significant factor (P = 0.0361). In addition, early recurrence after curative resection was observed more frequently in the importin-α1-positive group as compared to the negative group (P = 0.0023). The multivariate analysis identified importin-α1 as the only independent predictor of early recurrence after HCC resection (odds ratio = 5.291, P = 0.0191). CONCLUSIONS:Because importin-α1 might be closely associated with HCC progression, further analysis should be pursued to evaluate it as a novel prognostic target.

journal_name

Ann Surg Oncol

authors

Yoshitake K,Tanaka S,Mogushi K,Aihara A,Murakata A,Matsumura S,Mitsunori Y,Yasen M,Ban D,Noguchi N,Irie T,Kudo A,Nakamura N,Tanaka H,Arii S

doi

10.1245/s10434-011-1569-7

subject

Has Abstract

pub_date

2011-07-01 00:00:00

pages

2093-103

issue

7

eissn

1068-9265

issn

1534-4681

journal_volume

18

pub_type

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