Current status of accelerated partial breast irradiation.

Area of Science:

• Oncology
• Radiation Oncology
• Surgical Oncology

Background:

• Accelerated partial breast irradiation (APBI) is a radiotherapy technique for breast-conserving therapy.
• It targets the tumor bed post-surgery, hypothesizing that most recurrences are local.
• APBI aims to reduce treatment time and cost compared to whole breast irradiation.

Purpose of the Study:

• To review the current status and challenges of APBI.
• To assess its potential benefits and limitations in breast cancer treatment.

Main Methods:

• Review of existing APBI techniques: multicatheter interstitial brachytherapy, intracavitary brachytherapy, intraoperative radiation therapy, and 3D conformal external beam radiation therapy.
• Analysis of current clinical adoption and research findings.

Main Results:

• APBI is increasingly adopted in the US and Europe with promising short-term outcomes.
• Techniques vary, each with distinct advantages and disadvantages.
• Equivalence to whole breast radiation therapy is not yet fully established.
• Application in Japanese patients presents unique technical challenges due to smaller average breast size.

Conclusions:

• APBI shows potential for efficient breast cancer treatment but requires further validation.
• Long-term efficacy and safety need clarification through ongoing clinical trials.
• Optimizing APBI delivery methods for diverse patient populations, including those in Japan, is crucial.