External Beam Radiation Therapy for Liver Metastases

Area of Science:

• Oncology
• Radiation Oncology
• Medical Physics

Background:

• Stereotactic ablative radiotherapy (SABR) is a standard treatment for small liver metastases.
• Advanced radiotherapy techniques like 3D-CRT and IMRT facilitate SABR for small liver volumes.
• Larger liver tumors pose challenges for SABR due to limited healthy tissue and proximity to radiosensitive organs.

Purpose of the Study:

• To review the challenges and techniques for delivering SABR to larger liver tumors.
• To highlight the importance of managing specific clinical factors in SABR for liver metastases.

Main Methods:

• Review of current radiotherapy techniques for liver SABR.
• Discussion of challenges related to tumor size, normal tissue constraints, and organ motion.
• Emphasis on image guidance and fractionation strategies.

Main Results:

• SABR is feasible for small liver metastases using modern conformal techniques.
• Delivery of SABR for larger liver tumors is complex, requiring careful consideration of normal tissue.
• Techniques to manage respiratory motion and ensure accurate targeting are crucial for larger tumors.

Conclusions:

• SABR can be safely delivered to small liver tumors.
• Treating larger liver tumors with SABR necessitates advanced planning and delivery strategies.
• Image guidance, motion management, and appropriate fractionation are key to successful SABR for complex liver cases.