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Variance-reduced simulation of stochastic agent-based models for tumor growth
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It is shown that this hybrid PDE/Monte Carlo technique is able to significantly reduce the variance with only the (limited) additional computational cost associated with the deterministic solution of the coarse PDE.Abstract:
We investigate a hybrid PDE/Monte Carlo technique for the variance reduced simulation of an agent-based multiscale model for tumor growth. The variance reduction is achieved by combining a simulation of the stochastic agent-based model on the microscopic scale with a deterministic solution of a simplified (coarse) partial differential equation (PDE) on the macroscopic scale as a control variable. We show that this technique is able to significantly reduce the variance with only the (limited) additional computational cost associated with the deterministic solution of the coarse PDE. We illustrate the performance with numerical experiments in different regimes, both in the avascular and vascular stage of tumor growth.read more
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Hybrid multiscale modeling and prediction of cancer cell behavior
TL;DR: This paper is the first hybrid vascular multiscale modeling of cancer cell behavior that has the capability to predict cell phenotypes individually by a self-generated dataset and has the potential to combine the best features of both continuum and discrete models.
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Dll4 signalling through Notch1 regulates formation of tip cells during angiogenesis
Mats Hellström,Li-Kun Phng,Jennifer J. Hofmann,Elisabet Wallgard,Leigh Coultas,Per Lindblom,Per Lindblom,Jackelyn A. Alva,Ann Katrin Nilsson,Linda Karlsson,Nicholas Gaiano,Keejung Yoon,Janet Rossant,M. Luisa Iruela-Arispe,Mattias Kalén,Holger Gerhardt,Christer Betsholtz +16 more
TL;DR: Evidence is presented that delta-like 4 (Dll4)–Notch1 signalling regulates the formation of appropriate numbers of tip cells to control vessel sprouting and branching in the mouse retina, and modulators of Dll4 or Notch signalling, such as γ-secretase inhibitors developed for Alzheimer's disease, might find usage as pharmacological regulators of angiogenesis.