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Factors Associated with Late Local Radiation Toxicity after Post-Operative Breast Irradiation.

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Radiotherapy dose and breast volume are linked to late local radiation toxicity in breast cancer patients. Treatment de-escalation, like partial breast irradiation, may reduce toxicity while maintaining cancer control.

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Area of Science:

  • Oncology
  • Radiation Oncology
  • Medical Physics

Background:

  • Late local radiation toxicity is a significant concern for breast cancer patients undergoing whole breast irradiation.
  • Understanding the factors influencing this toxicity is crucial for optimizing treatment outcomes and patient quality of life.

Purpose of the Study:

  • To systematically review and assess determinants associated with late local radiation toxicity in patients treated for breast cancer.
  • To identify key variables that predict or influence the development of radiation-induced side effects after breast cancer treatment.

Main Methods:

  • A systematic review of studies reporting on variables associated with late local radiation toxicity after whole breast irradiation was conducted.
  • Included study designs were cohort studies, randomized controlled trials, and cross-sectional studies.
  • Data extracted included study characteristics, definitions of determinants, and outcome measures, with extraction of measures of association where possible.

Main Results:

  • Twenty-one studies were included. Radiotherapy dose and irradiated breast volume were significantly associated with late radiation toxicity in most studies.
  • Tumor bed boost showed association with late toxicity, fibrosis, and edema in several studies.
  • Results for patient-related factors (age, breast size, diabetes) and treatment-related factors (chemotherapy, timing) were inconsistent across studies.

Conclusions:

  • Radiotherapy dose and volume remain associated with late local radiation toxicity (fibrosis, edema) in modern 3D radiotherapy for breast cancer.
  • Treatment de-escalation strategies, such as partial breast irradiation in select patients, are important for reducing late toxicity without compromising survival.