Modifiable Postmastectomy Radiation Therapy Factors and Impact on Implant-Based Breast Reconstruction Outcomes

Area of Science:

• Oncology
• Plastic Surgery
• Radiation Oncology

Background:

• Modifiable radiation factors, including intensity-modulated radiation therapy, are linked to reduced toxicity.
• These factors may enhance reconstructive outcomes in patients receiving postmastectomy radiation therapy (PMRT).
• Their impact on implant-based breast reconstruction remains understudied.

Purpose of the Study:

• To investigate the association between radiation characteristics and reconstructive complications in patients undergoing implant-based breast reconstruction with PMRT.
• To identify specific radiation parameters that may influence the success of breast reconstruction.

Main Methods:

• Retrospective chart review of patients undergoing mastectomy with immediate tissue expander placement followed by PMRT.
• Collection of radiation characteristics: technique, bolus, x-ray energy, fractionation, maximum hot spot, and tissue volume receiving >105% or >107% of prescription dose.
• Analysis of reconstructive complications in relation to these radiation characteristics.

Main Results:

• Sixty-eight patients (70 breasts) were analyzed; overall complication rate was 28.6%, with infection being most common (24.3%).
• Higher maximum radiation hot spots were observed in patients requiring explantation (P=0.059).
• Increased tissue volumes receiving >105% and >107% of the dose were also noted in explantation group, but without statistical significance (P=0.176, P=0.313).

Conclusions:

• Minimizing radiation hot spots and high-dose volumes may improve outcomes in implant-based breast reconstruction following PMRT.
• Radiation dose distribution is a critical factor to consider for optimizing reconstructive success.