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Postmastectomy Radiation Therapy: An ASTRO/ASCO/SSO Clinical Practice Guideline.

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Postmastectomy radiation therapy (PMRT) is recommended for most node-positive breast cancer patients and select node-negative cases. These evidence-based guidelines offer updated indications, volumes, dosing, and techniques for optimal breast cancer treatment.

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Area of Science:

  • Oncology
  • Radiation Oncology
  • Breast Cancer Treatment

Background:

  • Postmastectomy radiation therapy (PMRT) involves treating the chest wall and regional lymph nodes after mastectomy for breast cancer.
  • Evolving evidence necessitates updated guidelines for PMRT indications, techniques, and treatment parameters.

Purpose of the Study:

  • To provide evidence-based recommendations on the use of postmastectomy radiation therapy (PMRT) in breast cancer treatment.
  • To detail indications for PMRT in both upfront surgical settings and after neoadjuvant systemic therapy.
  • To guide appropriate target volumes, dosing, and treatment techniques for PMRT.

Main Methods:

  • A multidisciplinary task force from ASTRO, ASCO, and SSO convened to address key questions on PMRT.
  • Recommendations were based on a systematic literature review using a predefined consensus-building methodology.
  • Evidence grading and strength of recommendation systems were employed to formulate guidelines.

Main Results:

  • PMRT is indicated for most node-positive breast cancer patients post-mastectomy and select node-negative cases.
  • PMRT is recommended after neoadjuvant therapy for locally advanced disease or residual nodal disease.
  • Guidelines specify treatment volumes, moderate hypofractionation, CT-based planning, and breath-hold techniques for PMRT.

Conclusions:

  • These updated, evidence-based recommendations aim to standardize and optimize the clinical application of PMRT in breast cancer management.
  • The guidelines address critical aspects of PMRT, from patient selection to technical delivery, enhancing treatment efficacy and safety.