DNA image cytometry and the expression of proliferative markers (proliferating cell nuclear antigen and Ki67) in non-Hodgkin's lymphomas

M. Czader, A. Porwit, E. Tani, A. Ost, J. Mazur, G. Auer

Research output: Contribution to journalArticle

20 Scopus citations

Abstract

We have analyzed DNA content and proliferative activity in morphologically defined cell subpopulations of 74 non-Hodgkin's lymphomas (NHL) and 29 reactive lymph nodes using DNA image cytometry and antibodies to proliferative markers (proliferating cell nuclear antigen (PCNA) and Ki67). Thirteen (18.6%) of 70 NHL cases were aneuploid. The follicular center cell-derived lymphomas with DNA aneuploidy had DNA indices (DI) predominantly in the tetraploid region, whereas aneuploid high-grade (HG) NHL presented DNA histograms with multiple aneuploid stemlines. In aneuploid centrocytic-centroblastic (CB/CC) NHLs, DNA aneuploidy was found exclusively in centroblasts, whereas centrocytes in these cases were diploid. Percentages of cells in S and G2/M phase in chronic lymphocytic leukemia (CLL), immunocytoma (IC), centrocytic NHL (CC), and centrocytes from CB/CC were low (< 5%), whereas the respective values for centroblasts in CB/CC and in malignant cells of HG NHL were similar to those of large lymphoid cells in the reactive lymph nodes (mean, 39.5%, 36.6%, and 53.5%, respectively). The mean percentage of PCNA positive cells in CLL, IC, and CC was 4.9%. In the follicles of CB/CC NHLs there was, on average, 56.9% of PCNA positive centroblasts and 8.1% of PCNA positive centrocytes. In HG NHL, the mean percentage of PCNA positive lymphoma cells was 27.9%. A positive correlation was found between percentages of cells in S and G2/M phase and cells positive for PCNA (P < 0.001). There was also a significant correlation between percentages of Ki67 (mean, 19.2%) and PCNA positive cells (mean, 17.7%) (P < 0.01). The histogram of frequency distribution for the S and G2/M fractions and for fractions positive for PCNA was asymmetric, with the cut-off value at approximately 30%. We conclude that DNA image cytometry detects aneuploidy even in small subpopulations of lymphoma cells and that anti-PCNA antibody can be used to determine proliferative fraction in paraffin-embedded material from NHL.

Original languageEnglish (US)
Pages (from-to)51-58
Number of pages8
JournalModern Pathology
Volume8
Issue number1
StatePublished - Jan 1 1995
Externally publishedYes

Keywords

  • DNA ploidy
  • Ki67
  • PCNA
  • non-Hogdkin's lymphoma
  • proliferation

ASJC Scopus subject areas

  • Pathology and Forensic Medicine

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