The effect of therapy on tumour vascular function.

Area of Science:

• Oncology
• Vascular Biology
• Cancer Therapeutics

Background:

• Malignant tissues exhibit structurally abnormal blood supply compared to normal tissues.
• Differences in neoplastic vasculature offer opportunities for selective modulation of tumor vascular function.
• Agents can induce reversible and irreversible effects on tumor blood flow.

Purpose of the Study:

• To explore the role of modulating tumor blood flow in cancer therapy.
• To discuss the use of vasoactive compounds for acute, transient changes in tumor blood flow.
• To highlight the potential detrimental effects of inappropriate blood flow modulation.

Main Methods:

• Review of agents inducing irreversible changes in tumor vascular function (e.g., hyperthermia, photodynamic therapy).
• Discussion of vasoactive compounds causing acute, transient changes in tumor blood flow.
• Analysis of blood flow modulation by agents like pimonidazole and cis-platinum in conjunction with radiotherapy.

Main Results:

• Certain agents (hyperthermia, photodynamic therapy, tumor necrosis factor, flavone acetic acid) primarily exert anti-tumor effects via irreversible vascular changes.
• Acute, transient modulation of tumor blood flow can be beneficial when used with conventional therapies.
• Inappropriate blood flow reduction during radiotherapy or chemotherapy can be detrimental.

Conclusions:

• Modulating tumor vascular function is a viable strategy in cancer treatment.
• Both chronic and acute blood flow modulation hold therapeutic potential.
• Careful consideration of agent-induced blood flow changes is crucial for optimizing cancer therapy outcomes.