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Published in: BMC Cancer 1/2006

Open Access 01-12-2006 | Research article

The associated expression of Maspin and Bax proteins as a potential prognostic factor in intrahepatic cholangiocarcinoma

Authors: Antonello A Romani, Paolo Soliani, Silvia Desenzani, Angelo F Borghetti, Pellegrino Crafa

Published in: BMC Cancer | Issue 1/2006

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Abstract

Background

Maspin, a member of the serpin family, is a suppressor of tumor growth, an inhibitor of angiogenesis and an inducer of apoptosis. Maspin induces apoptosis by increasing Bax, a member of the Bcl-2 family of apoptosis-regulating proteins. In this exploratory study, we investigated the associated expression of Maspin and Bax proteins as a potential prognostic factor in intrahepatic cholangiocarcinoma (IHCCA).

Methods

Twenty-two paraffin-embedded samples were analyzed by immunohistochemical methods using Maspin, Bax and CD34 antibodies. Maspin was scored semiquantitatively (HSCORE). Apoptosis was assessed using an antibody against cleaved caspase-3.

Results

The strong relationship observed between the expression of Maspin and Bax, indicates that Bax is likely to be the key effector of Maspin-mediated induction of apoptosis as indicated by the activation of cleaved caspase-3. We categorized Maspin HSCORE by calculating the optimal cutpoint. A Maspin HSCORE above the cutpoint was inversely related with tumor dimension, depth of tumor and vascular invasion. Uni/multivariate analysis suggests that a Maspin HSCORE below the cutpoint significantly worsens the patients' prognosis. Tumors with Maspin HSCORE below the cutpoint had a shorter survival (11+/-5 months) than did patients with Maspin HSCORE above the cutpoint (27+/-4 months), whereas Kaplan-Meier analysis and logrank test showed no significant difference in overall survival between the patients.

Conclusion

The associated expression of Maspin and Bax might delay tumor progression in IHCCA. Maspin above the cutpoint might counteract tumor development by increasing cell apoptosis, and by decreasing tumor mass and cell invasion. The combined expression of Maspin and Bax appears to influence the susceptibility of tumor cholangiocytes to apoptosis and thus may be involved in delaying IHCCA progression.
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Metadata
Title
The associated expression of Maspin and Bax proteins as a potential prognostic factor in intrahepatic cholangiocarcinoma
Authors
Antonello A Romani
Paolo Soliani
Silvia Desenzani
Angelo F Borghetti
Pellegrino Crafa
Publication date
01-12-2006
Publisher
BioMed Central
Published in
BMC Cancer / Issue 1/2006
Electronic ISSN: 1471-2407
DOI
https://doi.org/10.1186/1471-2407-6-255

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