In view of recent knowledge on proteins regulating the cell cycle, we re-evaluated proliferative features of 98 diffusely growing non-Hodgkin's lymphomas. The combined use of 5 proliferation-associated variables (mitotic indices and percentages of Ki-673, p3(4cdc)2+, cyclin A+ and cyclin B+ cells) and their entry into a multivariate cluster analysis separated, without overlaps, the entire cohort into 3 groups (clusters) with (1) low, (2) intermediate and (3) high proliferative activity. Conversely, bivariate plots exposed considerable cluster overlaps. Multivariate stepwise discriminant analysis of all cases revealed a decreasing order of discriminant power for% Ki-67+ cells > % p34(cdc)2+ cells > mitotic index > % cyclin A+ cells > % cyclin B+ cells. The combined use of 2 variables only, mitotic index and % p34(cdc)2+ cells, allowed a clear-cut separation of clusters 2 and 3. In bivariate plots, correlations were best between % Ki- 67+ cells and % cyclin A+ cells and between mitotic indices and % cyclin B+ cells. Except for chronic lymphocytic leukemias, immunocytomas and marginal zone lymphomas (all in cluster 1), individual lymphoma entities were distributed among at least 2 clusters. There was, however, a marked preponderance of mantle cell lymphomas and diffuse follicular center lymphomas in cluster 1 and of diffuse large B-cell lymphomas and peripheral T-cell lymphomas in cluster 2. Anaplastic large-cell lymphomas predominated in cluster 3 and responded best to therapy.
Expression of p34(cdc)2 and cyclins A and B compared to other proliferative features of non-Hodgkin's lymphomas: A multivariate cluster analysis / Leoncini, L.; Cossu, A.; Megha, T.; Bellan, C.; Lazzi, S.; Luzi, P.; Tosi, P.; Barbini, P.; Cevenini, G.; Pileri, S.; Giordano, A.; Kraft, R.; Laissue, J. A.; Cottier, H.. - In: INTERNATIONAL JOURNAL OF CANCER. - ISSN 0020-7136. - 83:2(1999), pp. 203-209. [10.1002/(SICI)1097-0215(19991008)83:2<203::AID-IJC10>3.0.CO;2-0]