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JOURNAL ARTICLE
RESEARCH SUPPORT, NON-U.S. GOV'T
The number of tumour-infiltrating TIA-1+ cytotoxic T cells but not FOXP3+ regulatory T cells predicts outcome in diffuse large B-cell lymphoma.
British Journal of Haematology 2007 May
The prognostic significance of tumour-infiltrating lymphocytes (TILs) in patients with diffuse large B-cell lymphoma (DLBCL) remains controversial. Furthermore, the possible impact of regulatory T cells (T(regs)) on survival in DLBCL is still unknown. We performed a retrospective study on the immunohistochemical expression of cytotoxic cells and T(regs), and their correlation with survival in 195 DLBCL patients. Patients with a small number of cytotoxic T-cell intracytoplasmic antigen-1 (TIA-1)+ T cells (< or =260 cells/mm(2) tumour area; n = 52) had significantly better outcome than patients with a large number (>260 cells/mm(2); n = 143); progression-free survival (PFS) at 5 years was 67% vs. 50% (P = 0.03) and overall survival (OS) was 73% vs. 57% (P = 0.03). In multivariate analysis, the low TIA-1+ group still had a better PFS (relative risk 0.75, 95% confidence interval 0.31-0.99; P = 0.05). The number of forkhead box protein 3 (FOXP3)+ T(regs) had no influence on PFS (P = 0.89) or OS (P = 0.75). These results suggest that immunohistochemical analysis of cytotoxic T cells at time of diagnosis could provide additional prognostic information. The lack of correlation between the number of FOXP3+ cells and survival could possibly indicate that tumour-infiltrating T(regs) are of less clinical importance in DLBCL. However, these findings need to be explored in functional studies.
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