The density of CD8+ T-cell infiltration and expression of BCL2 predicts outcome of primary diffuse large B-cell lymphoma of bone

Hajnalka Rajnai, Fenna H. Heyning, Lianne Koens, Anna Sebestyén, Hajnalka Andrikovics, Pancras C.W. Hogendoorn, András Matolcsy, Ágota Szepesi

Research output: Contribution to journalArticle

11 Citations (Scopus)

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.

Original languageEnglish
Pages (from-to)229-239
Number of pages11
JournalVirchows Archiv
Volume464
Issue number2
DOIs
Publication statusPublished - Feb 1 2014

Keywords

  • Bone neoplasm
  • Diffuse large B-cell lymphoma
  • Microenvironment
  • Primary bone lymphoma

ASJC Scopus subject areas

  • Pathology and Forensic Medicine
  • Molecular Biology
  • Cell Biology

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