Abstract
Primary bone lymphoma (PBL) comprises 5 % of all extranodal non-Hodgkin's lymphomas (NHLs). Diffuse large B-cell lymphoma (DLBCL) accounts for the majority of cases, which is the most heterogeneous group of lymphomas. Previous studies suggested that besides the tumor cell phenotype, phosphatidylinositol 3-kinase/acutely transforming retrovirus/mammalian target of rapamycin (PI3K/AKT/mTOR) pathway activity and the composition of the immune-microenvironment of DLBCL influence the clinical behavior of the disease. The aim of our study was to determine the relationship between clinical factors, tumor cell phenotype, microenvironment, PI3K/AKT/mTOR pathway activity, and disease outcome in primary bone diffuse large B-cell lymphoma (PB-DLBCL). We constructed tissue-microarrays from 41 cases of PB-DLBCL. To characterize tumor cell phenotype, T-cell subsets, macrophages, and PI3K/AKT/mTOR pathway activity immunohistochemical stainings were evaluated. Kaplan–Meier survival analysis provided evidence that age (≤65), CD3 and CD8+ T cell infiltrations >5 %, low BCL2 expression of the tumor cells (≤30 %), and low proliferation index (Ki67 ≤ 57 %) were associated with favorable outcome of PB-DLBCL patients. Multivariate analysis revealed that CD8+ T cell infiltration >5 % and low BCL2 expression (≤30 %) were independent predictors of survival. Increased macrophage infiltration (>10 %) showed tendency toward an adverse prognostic effect. International prognostic index, tumor cell phenotype (GCB or ABC), MYC protein expression, and activation of PI3K/AKT/mTOR pathway had no significant impact on survival. However, mTOR activity showed a significant correlation with activated B-cell phenotype. We conclude that CD8 and BCL2 expressions are potential prognostic markers for PB-DLBCL patients and the PI3K/AKT/mTOR pathway appears to be an additional therapeutic target in PB-DLBCL with activated-B-cell phenotype.
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Abbreviations
- ABC:
-
Activated B-cell
- AKT:
-
Acutely transforming retrovirus
- BCL2:
-
B-cell lymphoma 2
- DLBCL:
-
Diffuse large B-cell lymphoma
- GCB:
-
Germinal center B-cell
- IPI:
-
International prognostic index
- PBL:
-
Primary bone lymphoma
- PB-DLBCL:
-
Primary bone diffuse large B-cell lymphoma
- PI3K:
-
Phosphatidylinositol 3-kinase
- mTOR:
-
Mammalian target of rapamycin
- MYC:
-
Myelocytomatosis viral oncogene homolog
- NHL:
-
Non-Hodgkin's lymphoma
- TMA:
-
Tissue microarray
- pS6:
-
Phosphorylated ribosomal-S6 protein
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Acknowledgments
This work was supported by the Tumor Progression Research Group—Joint Research Organization of The Hungarian Academy of Sciences and Semmelweis University, Budapest, Hungary and by a grant from OTKA K76204.
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Rajnai, H., Heyning, F.H., Koens, L. et al. The density of CD8+ T-cell infiltration and expression of BCL2 predicts outcome of primary diffuse large B-cell lymphoma of bone. Virchows Arch 464, 229–239 (2014). https://doi.org/10.1007/s00428-013-1519-9
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DOI: https://doi.org/10.1007/s00428-013-1519-9