Prognostic significance of CD95, P53, and BCL2 expression in extranodal non-Hodgkin's lymphoma.

Apoptosis-related proteins play an important role in lymphoma cell death during chemotherapy. In our study, we investigated the prognostic significance of CD95, BCL2, and P53 expression in extranodal non-Hodgkin's lymphoma (NHL). We examined 71 patients with extranodal NHL [45 diffuse large B-cell lymphomas (DLBCLs) and 26 mucosa-associated lymphoid tissue lymphomas (MALTLs)], 35 male and 36 female, with a median age of 65.8 years. The most common site of origin was the stomach (N = 31). Paraffin-embedded specimens were analyzed immunohistochemically for CD95, BCL2, and P53 expression. Multivariate analysis revealed that in DLBCLs, positive CD95 and negative BCL2 expression were independent prognostic factors for overall survival. We reached the same conclusion for MALTLs, with positive CD95 and negative P53 expression. In DLBCLs, the 5-year overall survival rate was 71.5% for the CD95-positive cases and 35% for the CD95-negative cases (p = 0.004) and the 5-year overall survival was significantly better in BCL2-negative cases (70.8%) when compared to BCL2-positive cases (37%; p = 0.009). In MALTLs, the 5-year overall survival rate for the CD95-positive and CD95-negative groups was 89.5% and 42.9%, respectively (p = 0.004) and the 5-year overall survival rate was 50% for the P53-positive cases and 88.9% for the P53-negative cases (p = 0.016). In conclusion, positive CD95 expression proved to be a good prognostic factor of overall survival in both extranodal DLBCLs and MALTLs. In contrast, positive expression of BCL2 and P53 was found to be unfavorably associated with survival in extranodal DLBCLs and MALTLs, respectively.