To better comprehend the relationships between cell birth and cell death in neoplastic disorders, the topography of these events needs to be considered. We applied a computerized nearest-neighbor analysis to malignant, diffuse follicular-center-cell lymphomas in order to examine the spatial distribution of pyknotic (apoptotic) cells/bodies (A) and mitotic figures (M) in relation to capillaries (C) and venules (V). The results revealed a complex dispersion pattern, with significant aggregations of A and M, in addition to an even greater random distribution component. The greatest clustering displayed by A was around capillaries (A-C, 42% reduction of object frequency between the first and second distance class), followed by A-A (33%), A-V (24%) and A-M (12%). Additional values for mitotic figures were: M-M (45%), M-V (33%) and M-C (22%). These findings may reflect the relative importance of inherent properties of the neoplastic and host factors, respectively, in the regulation of cell birth and cell death rates.