Abstract
Stochastic differential equations (SDEs) provide an appropriate framework for modeling biomedical problems, since they allow detailed a priori biochemical knowledge to be accounted for and at the same time are able to describe the noise in the systems under investigation and in the data without excessively complicating the settings. We present three application paradigms related to an intracellular signaling pathway, to radio-oncological treatments, and to cell dispersal.
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Notes
- 1.
Random ODEs are ODEs that include random variables or stochastic processes in their coefficients. Unlike SDEs they can be handled pathwise using deterministic rather than stochastic calculus, see e.g., [37].
- 2.
All these models can actually be put in the framework of SDEs, some of which are however driven by jump processes and not by Brownian motions.
- 3.
Taken from [75].
- 4.
We used that x 3(0) = 0 and extended x 3 by this value on the interval [−δ, 0].
- 5.
Due to the nonlinearity of the system, the large number of parameters to be estimated, and the rather small amount of available data, however, the practical handling of this issue is still not feasible.
- 6.
Hereby the growth limiting is realized by the expectation of the stochastic process of the relevant concentration.
- 7.
See [75].
- 8.
Characterizing the evolution of the number of clonogens w.r.t. the standard reference population of N ref individuals (usually in literature N ref = 106) after the moment of the illness detection. Hence t represents the time passed since the diagnosis of cancer has been set. A patient is considered to be cured at the first time τ c when \(C_{\gamma }(\tau _{c}) = 0\).
- 9.
- 10.
- 11.
Following the terminology in literature, we shall say that equation (9.37) characterizes the mesoscopic scale of cell dispersal.
- 12.
Observe that this is a mixture of two simpler (Gaussian) kernels, whereby its weights may vary with the cell’s inner dynamics. Thus, the cell motion experiences a higher bias in the direction of the chemoattractant gradient \(\nabla S\) if the weight α 2(y) outperforms its unit conjugate α 1(y). In [38, 39] the same type of turning kernel has been used in a multiscale model for tumor cell migration through tissue network. Unlikely most of the turning kernels proposed so far in the literature (see e.g., [28]) it explicitly involves the gradient of the chemoattractant.
- 13.
For instance, it could be defined as in [39] by ϕ(ξ):= ξ for \(s_{1} \leq \vert \xi \vert \leq s_{2}\) and \(\phi (\xi ):= s_{2} \frac{\xi } {\vert \xi \vert }\) for |ξ| > s 2 , respectively \(\phi (\xi ):= s_{1} \frac{\xi } {\vert \xi \vert }\) for |ξ| < s 1 , whereby the set V of velocities is assumed to be symmetric, of the form \(V = [s_{1},s_{2}] \times {\mathbb{S}}^{n-1}\).
- 14.
Some parts of this subsection have been reproduced from [74] with permission.
- 15.
Observe that the method outlined in Sect. 9.4.3 enables to directly compute the macroscopic cell density n(t, x), without needing to go through the intermediate step of assessing its mesoscopic (higher dimensional) counterpart f(t, x, v, y) as e.g., in the PDE approach. Hence this implies a dimension reduction from 2N + 2 to N.
- 16.
Of course, the influence of the subcellular dynamics cannot be seen on this level of a random individual path.
- 17.
Taken from [76].
- 18.
More precisely their respective projections on the x 1 Ox 2 plane.
- 19.
See [73].
- 20.
Figures reproduced from [73].
- 21.
- 22.
Observe that for γ > 0 the bacterial population asymptotically goes over into an unbiased regime.
- 23.
Though not in an explicit way.
- 24.
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Acknowledgement
Christina Surulescu was partially supported by the Baden-Württemberg Foundation.
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Surulescu, C., Surulescu, N. (2013). Some Classes of Stochastic Differential Equations as an Alternative Modeling Approach to Biomedical Problems. In: Kloeden, P., Pötzsche, C. (eds) Nonautonomous Dynamical Systems in the Life Sciences. Lecture Notes in Mathematics(), vol 2102. Springer, Cham. https://doi.org/10.1007/978-3-319-03080-7_9
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