HDR brachytherapy for anal cancer

Area of Science:

• Oncology
• Radiation Oncology
• Medical Physics

Background:

• Anal cancer treatment aims to maximize tumor dose while preserving anal sphincter function.
• A shift from radical surgery to conservative treatments like chemoradiotherapy is evident.
• Conventional radiotherapy techniques face challenges in dose escalation and organ sparing.

Purpose of the Study:

• To review the role and advancements of brachytherapy (BT) in anal cancer treatment.
• To evaluate the combination of external beam radiotherapy (EBRT) and BT for improved outcomes.
• To discuss various BT techniques and their clinical results.

Main Methods:

• Review of established and emerging radiotherapy techniques for anal cancer.
• Focus on intensity-modulated radiotherapy (IMRT) and brachytherapy (BT).
• Discussion of image-based 3D treatment planning and intensity-modulated brachytherapy (IMBT).

Main Results:

• Intensity-modulated radiotherapy (IMRT) shows reduced acute toxicity and high local control rates.
• Brachytherapy (BT) is an effective boost irradiation method, especially combined with EBRT and chemotherapy.
• Advanced BT techniques, including IMBT, enhance therapeutic potential by allowing higher tumor doses and reduced normal tissue irradiation.

Conclusions:

• The combination of EBRT and BT enables dose escalation to the tumor and sparing of organs at risk.
• Improvements in local control and reductions in toxicity are achievable with advanced BT techniques.
• Modern brachytherapy offers significant therapeutic potential in anal cancer management.