Hypofractionated vs Conventionally Fractionated Postmastectomy Radiation After Implant-Based Reconstruction: A...

Area of Science:

• Oncology
• Radiation Oncology
• Breast Cancer Treatment

Background:

• Postmastectomy radiation therapy (PMRT) is crucial for local-regional disease control and survival in breast cancer patients.
• Hypofractionation (HF) regimens offer comparable efficacy and complication rates to conventional fractionation (CF) with improved quality of life.
• Prospective data on HF use after mastectomy in patients undergoing breast reconstruction were lacking.

Purpose of the Study:

• To compare the outcomes of hypofractionated (HF) versus conventional fractionation (CF) PMRT in patients undergoing implant-based breast reconstruction.
• To evaluate the impact of different fractionation schedules on quality of life and toxic effects.

Main Methods:

• A randomized clinical trial involving 400 patients (18+ years) undergoing mastectomy, immediate implant reconstruction, and unilateral PMRT.
• Patients were randomized to either HF (4256 cGy/16 fractions) or CF (5000 cGy/25 fractions) PMRT.
• The primary outcome was the change in physical well-being (PWB) using the FACT-B tool at 6 months post-PMRT.

Main Results:

• No significant difference in the change of PWB was observed between HF and CF arms overall.
• Younger patients (<45 years) showed significantly higher 6-month PWB scores with HF compared to CF (P=.047).
• HF was associated with less bother from adverse effects (P=.02) and nausea (P=.04), and fewer treatment breaks (P=.03).

Conclusions:

• Hypofractionated PMRT did not demonstrate a significant overall improvement in physical well-being compared to conventional fractionation in this cohort.
• However, HF showed a potential benefit for younger patients (<45 years) undergoing implant-based reconstruction.
• These findings contribute to the growing body of evidence on HF PMRT in breast reconstruction patients.