NCCN Guidelines Update: Evolving Radiation Therapy Recommendations for Breast Cancer

Area of Science:

• Oncology
• Radiation Oncology
• Breast Cancer Treatment

Background:

• Current NCCN Clinical Practice Guidelines in Oncology (NCCN Guidelines) for Breast Cancer provide recommendations for adjuvant radiotherapy.
• Whole-breast irradiation following breast-conserving surgery is a key component of adjuvant therapy.
• Previous guidelines addressed accelerated partial-breast irradiation (APBI) and regional nodal irradiation (RNI) with evolving criteria.

Purpose of the Study:

• To summarize the updated NCCN Guidelines for Breast Cancer regarding adjuvant radiotherapy options.
• To highlight preferred hypofractionation schedules for whole-breast irradiation.
• To outline current recommendations for APBI suitability and RNI indications.

Main Methods:

• Review of the latest NCCN Clinical Practice Guidelines in Oncology (NCCN Guidelines) for Breast Cancer.
• Analysis of recommendations for adjuvant radiotherapy, including whole-breast irradiation, APBI, and RNI.
• Incorporation of updated definitions and criteria from relevant professional societies, such as the American Society for Radiation Oncology.

Main Results:

• Hypofractionation is the preferred adjuvant radiotherapy option for whole-breast irradiation post-breast-conserving surgery.
• The NCCN Guidelines have adopted the American Society for Radiation Oncology's updated definition of "suitability" for APBI.
• Regional nodal irradiation is indicated for patients with ≥4 positive nodes and strongly considered for 1-3 positive nodes and select high-risk node-negative patients.

Conclusions:

• The NCCN Guidelines advocate for hypofractionation in adjuvant whole-breast irradiation.
• Updated criteria enhance the appropriate selection of patients for APBI.
• RNI plays a crucial role in managing nodal disease and recurrence risk in breast cancer patients.