EXPRESSION OF CD44 VARIANTS IN GASTRIC-CARCINOMA WITH OR WITHOUT EPSTEIN-BARR-VIRUS

The significance of CD44 variants in gastric carcinoma has not been fu lly investigated in terms of the pathological features of the carcinom a, including its association with Epstein-Barr virus (EBV). In this st udy, a total of 104 primary gastric carcinoma tissues (EBV-associated gastric carcinomas, EBVaGC, and EBV-negative carcinomas) were evaluate d by immunohistochemistry. When the immunoreactivity of formalin-fixed , paraffin-embedded sections was graded on frequencies of grades 0-1, 2 and 3 were, respectively, 77%, 16% and 7% using monoclonal antibody (MAb) 3G5, which recognizes V3-5, and 70%, 14% and 15% with MAb 2F10, which recognizes V6. The expression of CD44 variants is independently correlated with lymph node metastasis and EBV-association in gastric c arcinoma. Significant correlations were observed between V3-5 expressi on and lymph vessel invasion or lymph node metastasis, and between V6 expression and lymph node metastasis. The expression of both variants was significantly correlated with EBV-association. EBV-association and lymph node metastasis contributed independently to CD44 variant expre ssion by multivariate analysis, Thus, the mechanism and significance o f CD44 variant-expression are different in gastric carcinomas with or without EBV. EBVaGC is a distinct type of gastric carcinoma which shou ld be considered separately from EBV-negative carcinoma. (C) 1997 Wile y-Liss, Inc.