Perfusion analyses in advanced breast carcinoma during hyperthermia

Area of Science:

• Oncology
• Medical Physics
• Biomedical Engineering

Background:

• Blood flow in tumors and healthy tissues is critical for achieving therapeutic temperatures during clinical hyperthermia.
• Understanding heat transport in vascularized tissues is complex, with current theories lacking adequacy.
• Vascularized breast tissues require significantly more power for hyperthermia than stationary phantoms, highlighting the role of blood flow.

Purpose of the Study:

• To investigate tissue blood flow, specifically perfusion (PERF), in patients undergoing hyperthermia treatment for advanced breast tumors.
• To analyze the relationship between perfusion, tumor characteristics, and the ability to achieve adequate temperature distributions during hyperthermia.

Main Methods:

• Diagnostic data on tissue blood flow was collected during hyperthermia treatment by analyzing absorbed power and temperature rise.
• Perfusion (PERF) was determined in 23 patients with advanced breast tumors.
• Statistical analysis was performed to assess relationships between PERF, tumor volume, and heating efficacy.

Main Results:

• Perfusion (PERF) generally remained stable during the stationary phase of hyperthermia sessions.
• Minimum tumor PERF did not correlate with tumor volume.
• No significant relationship was found between tumor PERF and the ability to effectively heat the tumors.
• PERF levels demonstrated variability, with instances of both increase and decrease observed post-treatment.

Conclusions:

• Blood flow is a crucial factor in hyperthermia treatment for breast cancer.
• Tumor perfusion is complex and does not consistently correlate with tumor size or heating outcomes.
• Further research is needed to fully understand the role of perfusion in hyperthermia and optimize treatment strategies.