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Mathematicians Develop New Treatment Strategies for Malignant Tumors

By R&D Editors | April 13, 2016

In numerical simulations by the Bonn researchers, the long-term success of a therapy, even when the starting conditions were the same, depended on random fluctuations in the population sizes of cancer and immune cells. Mathematicians and physicians at the University of Bonn have developed a new model for immunotherapy of cancer. The method could help to develop new treatment strategies and to understand why some approaches do not work with certain tumors. The study is now appearing in the technical journal Scientific Reports.

One of the greatest problems in the fight against cancer is the great hardiness of the tumors. Drug therapy often leads to initial success, which is then wiped out by a relapse. Sometimes the therapy has no effect at all against some cancer cells. Other cells develop resistance over the course of therapy.

Certain cells of the immune system, the so-called T-cells, can fight malignant tumors. Such cells are used or activated in a targeted manner to treat cancers. The research groups of Prof. Dr. Thomas Tüting and Prof. Dr. Michael Hölzel of the University of Bonn have demonstrated in their experiments on skin cancer that tumor cells can change their external appearance, if an inflammatory reaction occurs in the course of treatment. Consequently, the T-cells no longer recognize them as harmful, and the cancer can continue to spread unimpeded.

A new model from mathematicians and physicians from the Excellence Cluster of the Hausdorff Center for Mathematics and ImmunoSensation of the University of Bonn now describes this effect mathematically, thus making it possible to analyze it. In the future, the model could be used, among other things, for computer simulation of various therapeutic approaches and, thus, for the development of optimal treatment strategies.

Tumors as population

“The initial results show that treatment with several types of immune cells could in fact be a promising approach,” says the lead scientist of this work, Prof. Dr. Anton Bovier of the Hausdorff Center for Mathematics. The studies are based on a stochastic model from the area of adaptive dynamics, which was developed by the mathematicians for application, for example, in cancer research. “Tumors are nothing other than populations of cancer cells, which interact with one another in a very complex manner and react to their environment in the form of the body and its immune system,” explains Bovier.

Simulation of therapy

In numerical simulations by the Bonn researchers, the long-term success of a therapy, even when the starting conditions were the same, depended on random fluctuations in the population sizes of cancer and immune cells. Whether this effect also occurs in reality and not just on the computer still needs to be investigated experimentally. The virtual research of the Excellence Cluster has also showed that treatment, under certain circumstances, can even increase the probability of mutation in cancer cells. In some cases in the simulation, a therapy actually accelerated the development toward aggressive variants of cancer.

Professor Hölzel of ImmunoSensation summarizes the results of the interdisciplinary work as follows: “This project can both call the attention of mathematicians to possible applications of their work in a medical context and also sensitize physicians to the use of mathematical methods. In any case, we will continue to do joint research in the fight against cancer.” To make it possible to use the model in practice, more experimental data still needs to be developed.

Citation: Martina Baar, Loren Coquille, Hannah Mayer, Michael Hölzel, Meri Rogava, Thomas Tüting & Anton Bovier (2016): A stochastic model for immunotherapy of cancer. Scientific Reports. DOI: 10.1038/srep24169.

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