Disturbed XIAP and XAF1 expression balance is an independent prognostic factor in gastric adenocarcinomas.

Abstract:

BACKGROUND:Dysregulation of apoptosis is a key factor in carcinogenesis and tumor progression. X-linked inhibitor of apoptosis (XIAP) is the most potent member of the inhibitor of apoptosis protein (IAP) family, which directly inhibits apoptosis by binding to caspases. Antagonists of XIAP have recently been identified: second mitochondria-derived activator of caspase/direct IAP-binding protein with low PI (Smac/DIABLO) and XIAP-associated factor 1 (XAF1). However, little research has been conducted on the association between gastric cancer survival and the mechanism of apoptosis involving XIAP and its antagonists, Smac/DIABLO and XAF1. METHODS:XIAP, Smac/DIABLO, and XAF1 expression was analyzed by immunohistochemistry (IHC) in 187 gastric adenocarcinomas. Correlations between XIAP, Smac/DIABLO or XAF1 expression and clinicopathological factors were analyzed. Disease-specific survival after surgery was examined. RESULTS:Of 187 samples, XIAP was overexpressed in 140, Smac was overexpressed in 117, and XAF1 was overexpressed in 106. Individually, XIAP, Smac, and XAF1 were not significantly associated with disease-specific survival. However, patients showing high expression of XIAP and low expression of XAF1 had significantly poorer survival when compared with other groups (P = 0.024). CONCLUSION:The expression balance of XIAP and XAF1 is an independent prognostic factor in gastric adenocarcinoma.

journal_name

Ann Surg Oncol

authors

Shibata T,Noguchi T,Takeno S,Gabbert HE,Ramp U,Kawahara K

doi

10.1245/s10434-008-0062-4

subject

Has Abstract

pub_date

2008-12-01 00:00:00

pages

3579-87

issue

12

eissn

1068-9265

issn

1534-4681

journal_volume

15

pub_type

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