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Journal of Oncology
Volume 2015, Article ID 698760, 11 pages
http://dx.doi.org/10.1155/2015/698760
Research Article

Fractal Dimensions of In Vitro Tumor Cell Proliferation

11st Department of Pediatrics, University of Athens, Choremeio Research Laboratory, Thivon & Levadeias, 11527 Athens, Greece
2Division of Clinical Immunology and Transfusion Medicine, Department of Laboratory Medicine, Karolinska Institute, 171 77 Stockholm, Sweden

Received 23 August 2014; Accepted 19 November 2014

Academic Editor: Vassileios Zoumpourlis

Copyright © 2015 George I. Lambrou and Apostolos Zaravinos. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Biological systems are characterized by their potential for dynamic adaptation. One of the challenges for systems biology approaches is their contribution towards the understanding of the dynamics of a growing cell population. Conceptualizing these dynamics in tumor models could help us understand the steps leading to the initiation of the disease and its progression. In vitro models are useful in answering this question by providing information over the spatiotemporal nature of such dynamics. In the present work, we used physical quantities such as growth rate, velocity, and acceleration for the cellular proliferation and identified the fractal structures in tumor cell proliferation dynamics. We provide evidence that the rate of cellular proliferation is of nonlinear nature and exhibits oscillatory behavior. We also calculated the fractal dimensions of our cellular system. Our results show that the temporal transitions from one state to the other also follow nonlinear dynamics. Furthermore, we calculated self-similarity in cellular proliferation, providing the basis for further investigation in this topic. Such systems biology approaches are very useful in understanding the nature of cellular proliferation and growth. From a clinical point of view, our results may be applicable not only to primary tumors but also to tumor metastases.