E-cadherin and beta-catenin expression in Epstein-Barr virus-associated gastric carcinoma and their prognostic significance.
OBJECTIVE
To examine the role of E-cadherin and beta-catenin in carcinogenesis and to assess their prognostic implication in Epstein-Barr virus-associated gastric carcinomas (EBV-GCs).


METHODS
We compared the frequency of E-cadherin and beta-catenin expression in 59 EBV-GCs and 120 non-EBV-GCs, and examined the association between patients' prognosis and the expressions of these proteins.


RESULTS
Neither the cellular-membranous nor the cytoplasmic E-cadherin expression showed any difference between EBV-GCs and non-EBV-GCs. On the other hand, loss of membranous expression of beta-catenin occurred more frequently in non-EBV-GCs than EBV-GCs [odds ratio = 0.41; 95% confidence interval (CI), 0.19-0.90]. Furthermore, the nuclear and/or cytoplosmic expression of beta-catenin was seen more frequently in EBV-GCs than non-EBV-GCs (odds ratio = 2.23; 95% CI, 0.97-5.09), and was observed in a larger proportion of carcinoma cells of EBV-GCs than non-EBV-GCs (P = 0.024). Survival analysis for non-EBV-GC revealed that lymph node metastasis was significantly associated with poor prognosis (P < 0.001). Among EBV-GCs, the depth of invasion (P = 0.005), lymph node metastasis (P = 0.004) and an intestinal type by Lauren classification (hazard ratio = 9.47; 95% CI, 2.67-33.6) were significantly associated with poor prognosis. On the other hand, nuclear and/or cytoplasmic expression of beta-catenin was associated with a better prognosis in patients with EBV-GC (hazard ratio = 0.32; 95% CI, 0.11-0.93).


CONCLUSIONS
We observed more frequent preservation of beta-catenin in cell membrane and accumulation in nuclei and/or cytoplasm in EBV-GCs than in non-EBV-GCs. Factors involved in the prognosis of EBV-GCs and non-EBV-GCs are different in the two conditions.
Koriyama
Chihaya
C
Department of Epidemiology and Preventive Medicine, Kagoshima University Graduate School of Medical and Dental Sciences, 8-35-1 Sakuragaoka, Kagoshima, 890-8544, Japan. akiba@m.kufm.kagoshima-u.ac.jp
Akiba
Suminori
S
Itoh
Tetsuhiko
T
Sueyoshi
Kazunobu
K
Minakami
Yoshie
Y
Corvalan
Alejandro
A
Yonezawa
Suguru
S
Eizuru
Yoshito
Y
D000368:Aged; D015820:Cadherins / Q000096:biosynthesis*; D002277:Carcinoma / Q000150:complications* / Q000821:virology*; D016022:Case-Control Studies; D002462:Cell Membrane / Q000378:metabolism; D002467:Cell Nucleus / Q000378:metabolism; D003593:Cytoplasm / Q000378:metabolism; D020031:Epstein-Barr Virus Infections / Q000150:complications* / Q000175:diagnosis / Q000821:virology*; D005260:Female; D015972:Gene Expression Regulation, Neoplastic; D004854:Herpesvirus 4, Human / Q000378:metabolism*; D006801:Humans; D008297:Male; D008875:Middle Aged; D011379:Prognosis; D013274:Stomach Neoplasms / Q000150:complications* / Q000175:diagnosis / Q000821:virology*; D051176:beta Catenin / Q000096:biosynthesis*
D015820:Cadherins; D051176:beta Catenin