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Related Experiment Videos

Axillary lymph node dose with tangential breast irradiation.

Daniel R Reed1, Skyler Karen Lindsley, Gary N Mann

  • 1Radiation Oncology, University of Washington Medical Center, Seattle, WA 98195, USA. drreed@u.washington.edu

International Journal of Radiation Oncology, Biology, Physics
|January 26, 2005
PubMed
Summary

Standard breast radiation therapy often underdoses axillary lymph nodes in early-stage breast cancer. Three-dimensional planning is crucial for improving radiation coverage of these critical areas.

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Area of Science:

  • Radiation Oncology
  • Medical Physics
  • Breast Cancer Treatment

Background:

  • Sentinel lymph node biopsy has reduced axillary surgery extent in breast cancer staging.
  • Accurate radiation dose distribution in the axilla is vital for treatment planning and outcome analysis.

Purpose of the Study:

  • To analyze radiation dose distribution to axillary lymph node levels I and II using conventional tangential fields and CT-based 3D planning.
  • To assess coverage of anatomically defined lymph node volumes and surgical clips.

Main Methods:

  • Evaluated 50 early-stage breast cancer patients undergoing breast conservation therapy.
  • Utilized 3D CT-based planning for conventional tangential breast fields.
  • Defined axillary lymph node volumes (levels I-II) and surgical clips via CT and dissection.

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Main Results:

  • Conventional tangential fields provided <95% isodose coverage for an average of 45% of axillary lymph node volume.
  • No patient achieved complete coverage of axillary levels I-II by the 95% isodose line.
  • Surgical clips showed 80% mean coverage by the 95% isodose line, indicating inadequate delineation.

Conclusions:

  • Standard tangential breast radiation fields inadequately irradiate axillary lymph node levels I and II.
  • Surgical clips do not sufficiently delineate the target axillary region.
  • Modified tangential fields with 3D planning, targeting defined axillary volumes, are necessary for effective irradiation.