Perfluoroctylbromide: a reticuloendothelial-specific and tumor-imaging agent for computed tomography

Area of Science:

• Medical Imaging
• Radiology
• Oncology

Background:

• Perfluoroctylbromide (PFOB) is a potential contrast agent for medical imaging.
• Accurate tumor detection and characterization are crucial in oncology.

Purpose of the Study:

• To evaluate PFOB as a liver/spleen-specific and tumor imaging agent.
• To assess the impact of PFOB on computed tomographic (CT) scanning in a VX2 tumor rabbit model.

Main Methods:

• Thirty rabbits with VX2 tumors underwent CT scanning post-sacrifice.
• PFOB emulsion was administered intravenously 48 hours prior to sacrifice in half the animals.
• PFOB concentration, liver/spleen CT numbers, and tumor rim enhancement were analyzed.

Main Results:

• PFOB significantly increased CT numbers in the liver (+49 HU) and spleen (+250 HU).
• A notable enhancement of the tumor rim (102 HU increase) was observed due to PFOB accumulation in macrophages.
• The estimated half-life of PFOB in the liver and spleen was approximately five days.

Conclusions:

• PFOB demonstrates potential as a liver/spleen-specific contrast agent.
• PFOB enhances tumor visualization, particularly at the tumor periphery, via macrophage uptake.
• Further investigation into PFOB's diagnostic utility in oncology is warranted.