title: The effect of interstitial pressure on therapeutic agent transport: coupling with the tumor blood and lymphatic vascular systems.
abstract: Vascularized tumor growth is characterized by both abnormal interstitial fluid flow and the associated interstitial fluid pressure (IFP). Here, we study the effect that these conditions have on the transport of therapeutic agents during chemotherapy. We apply our recently developed vascular tumor growth model which couples a continuous growth component with a discrete angiogenesis model to show that hypertensive IFP is a physical barrier that may hinder vascular extravasation of agents through transvascular fluid flux convection, which drives the agents away from the tumor. This result is consistent with previous work using simpler models without blood flow or lymphatic drainage. We consider the vascular/interstitial/lymphatic fluid dynamics to show that tumors with larger lymphatic resistance increase the agent concentration more rapidly while also experiencing faster washout. In contrast, tumors with smaller lymphatic resistance accumulate less agents but are able to retain them for a longer time. The agent availability (area-under-the curve, or AUC) increases for less permeable agents as lymphatic resistance increases, and correspondingly decreases for more permeable agents. We also investigate the effect of vascular pathologies on agent transport. We show that elevated vascular hydraulic conductivity contributes to the highest AUC when the agent is less permeable, but to lower AUC when the agent is more permeable. We find that elevated interstitial hydraulic conductivity contributes to low AUC in general regardless of the transvascular agent transport capability. We also couple the agent transport with the tumor dynamics to simulate chemotherapy with the same vascularized tumor under different vascular pathologies. We show that tumors with an elevated interstitial hydraulic conductivity alone require the strongest dosage to shrink. We further show that tumors with elevated vascular hydraulic conductivity are more hypoxic during therapy and that the response slows down as the tumor shrinks due to the heterogeneity and low concentration of agents in the tumor interior compared with the cases where other pathological effects may combine to flatten the IFP and thus reduce the heterogeneity. We conclude that dual normalizations of the micronevironment - both the vasculature and the interstitium - are needed to maximize the effects of chemotherapy, while normalization of only one of these may be insufficient to overcome the physical resistance and may thus lead to sub-optimal outcomes.
authors.affiliation: Department of Mathematics, University of California, Irvine, United States.
authors.forename: Min
authors.initials: M
authors.lastname: Wu
authors.affiliation: Department of Bioengineering and James Graham Brown Cancer Center, University of Louisville, Louisville, United States.
authors.forename: Hermann B
authors.initials: HB
authors.lastname: Frieboes
authors.affiliation: Division of Mathematics, University of Dundee, Dundee, Scotland, UK.
authors.forename: Mark A J
authors.initials: MA
authors.lastname: Chaplain
authors.affiliation: Institute of Petroleum Engineering, Heriot-Watt University, Edinburgh, Scotland, UK.
authors.forename: Steven R
authors.initials: SR
authors.lastname: McDougall
authors.affiliation: Department of Pathology, University of New Mexico, Albuquerque, United States; Department of Chemical Engineering, University of New Mexico, Albuquerque, United States.
authors.forename: Vittorio
authors.initials: V
authors.lastname: Cristini
authors.affiliation: Department of Mathematics, University of California, Irvine, United States; Department of Biomedical Engineering, University of California, Irvine, United States. Electronic address: lowengrb@math.uci.edu.
authors.forename: John S
authors.initials: JS
authors.lastname: Lowengrub
mesh_terms: D000818:Animals; D000970:Antineoplastic Agents / Q000493:pharmacokinetics / Q000627:therapeutic use; D001693:Biological Transport, Active; D001794:Blood Pressure; D006801:Humans; D042583:Lymphangiogenesis; D008954:Models, Biological; D008962:Models, Theoretical; D009369:Neoplasms / Q000098:blood supply / Q000188:drug therapy / Q000378:metabolism / Q000523:psychology; D009389:Neovascularization, Pathologic / Q000188:drug therapy / Q000378:metabolism / Q000503:physiopathology
chemical_list: D000970:Antineoplastic Agents
keywords: Cancer simulation; Chemotherapy; Interstitial fluid pressure; Tumor lymphatics; Tumor vasculature
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