Abstract
We consider the deterministic model of interaction between the immune system and tumor cells including a memory function that reflects the influence of the past states, to simulate the time needed by the latter to develop a chemical and cell mediated response to the presence of the tumor. The memory function is called delay kernel. The results are compared with those from other papers, concluding that the memory function introduces new instabilities in the system leading to an uncontrollable growth of the tumor. If the coefficient of the memory function is used as a bifurcation parameter, it is found that Hopf bifurcation occurs for kernel. The direction and stability of the bifurcating periodic solutions are determined. The deterministic model with delay allows stochastic perturbation. Mean value and square mean value of the linearized model are analyzed for the variables of the stochastic model. Some numerical simulations for justifying the theoretical analysis are also given.
Keywords: Tumor dynamics, growth rate, delay kernels, stochastic differential equation with delay, eigenvalue, eigenvector, Hopf bifurcation, local stability, local asymptotic stability, bifurcation parameter, bifurcation direction
Current Computer-Aided Drug Design
Title: Deterministic and Stochastic Model for the Role of the Immune Response Time Delay in Periodic Therapy of the Tumors
Volume: 7 Issue: 4
Author(s): Oana Chis, Mihaela Neamtu and Dumitru Opris
Affiliation:
Keywords: Tumor dynamics, growth rate, delay kernels, stochastic differential equation with delay, eigenvalue, eigenvector, Hopf bifurcation, local stability, local asymptotic stability, bifurcation parameter, bifurcation direction
Abstract: We consider the deterministic model of interaction between the immune system and tumor cells including a memory function that reflects the influence of the past states, to simulate the time needed by the latter to develop a chemical and cell mediated response to the presence of the tumor. The memory function is called delay kernel. The results are compared with those from other papers, concluding that the memory function introduces new instabilities in the system leading to an uncontrollable growth of the tumor. If the coefficient of the memory function is used as a bifurcation parameter, it is found that Hopf bifurcation occurs for kernel. The direction and stability of the bifurcating periodic solutions are determined. The deterministic model with delay allows stochastic perturbation. Mean value and square mean value of the linearized model are analyzed for the variables of the stochastic model. Some numerical simulations for justifying the theoretical analysis are also given.
Export Options
About this article
Cite this article as:
Chis Oana, Neamtu Mihaela and Opris Dumitru, Deterministic and Stochastic Model for the Role of the Immune Response Time Delay in Periodic Therapy of the Tumors, Current Computer-Aided Drug Design 2011; 7 (4) . https://dx.doi.org/10.2174/157340911798260313
DOI https://dx.doi.org/10.2174/157340911798260313 |
Print ISSN 1573-4099 |
Publisher Name Bentham Science Publisher |
Online ISSN 1875-6697 |
- Author Guidelines
- Graphical Abstracts
- Fabricating and Stating False Information
- Research Misconduct
- Post Publication Discussions and Corrections
- Publishing Ethics and Rectitude
- Increase Visibility of Your Article
- Archiving Policies
- Peer Review Workflow
- Order Your Article Before Print
- Promote Your Article
- Manuscript Transfer Facility
- Editorial Policies
- Allegations from Whistleblowers
Related Articles
-
The Common Mycobacterial Antigens and their Importance in the Treatment of Disease
Current Pharmaceutical Design Nutrapharmacology of Tocotrienols for Metabolic Syndrome
Current Pharmaceutical Design All for Statins and Statins for All; An Update
Current Pharmaceutical Design Genomic Organization and Control of the Grb7 Gene Family
Current Genomics Can Dietary Antioxidants Reduce the Incidence of Brain Tumors?
Current Drug Metabolism Mast Cells and Basophils: Trojan Horses of Conventional Lin- Stem/Progenitor Cell Isolates
Current Pharmaceutical Design Central Nervous System Disorders Associated to Immune Checkpoint Inhibitors
Current Cancer Therapy Reviews Novel Molecular Anti- Colorectalcancer Conjugate:Chlorambucil-Adipic Acid Dihydrizide-Glutamine
Anti-Cancer Agents in Medicinal Chemistry A Focus on Heme Oxygenase-1 (HO-1) Inhibitors
Current Medicinal Chemistry Unraveling Progesterone-Induced Molecular Mechanisms in Physiological and Pathological Conditions
Current Clinical Pharmacology New Improved Drug Delivery Technologies for Pentacyclic Triterpenes: A Review
Protein & Peptide Letters Optical Image-Guided Cancer Therapy
Current Pharmaceutical Biotechnology Quality Assessment of Diagnostic Methods Employed for Suspected Lung Cancer
Current Respiratory Medicine Reviews The Use of Ghrelin and Ghrelin Receptor Agonists as a Treatment for Animal Models of Disease: Efficacy and Mechanism
Current Pharmaceutical Design Evidence for Anti-Cancer Properties of Blueberries: A Mini-Review
Anti-Cancer Agents in Medicinal Chemistry Therapeutic Benefit and Biological Importance of Ginkgetin in the Medicine: Medicinal Importance, Pharmacological Activities and Analytical Aspects
Current Bioactive Compounds Rb at the Interface Between Cell Cycle and Apoptotic Decisions
Current Molecular Medicine Cardiovascular Effects of Current and Future Anti-Obesity Drugs
Current Vascular Pharmacology Telomeres and Thyroid Cancer
Current Genomics The Effect of A Hexanoic Acid Linker Insertion on the Pharmacokinetics and Tumor Targeting Properties of the Melanoma Imaging Agent 99mTc-HYNIC-cycMSH
Anti-Cancer Agents in Medicinal Chemistry