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Sentinel Lymph Node Biopsy After Initial Lumpectomy (SNAIL Study)-a Prospective Validation Study.

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Managing breast cancer after primary care lumpectomy requires further surgery. Sentinel lymph node biopsy (SLNB) is feasible, but definitive breast surgery is essential for all patients, regardless of initial margins.

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Area of Science:

  • Oncology
  • Surgical Oncology
  • Breast Cancer Management

Background:

  • Tertiary oncology centers manage breast cancer patients diagnosed post-lumpectomy in primary care.
  • Existing guidelines lack specific recommendations for further surgical management, including sentinel lymph node biopsy (SLNB) and cavity excision.

Purpose of the Study:

  • To evaluate the feasibility of SLNB in patients diagnosed with breast cancer after primary health care (PHC) lumpectomy.
  • To define the necessity of definitive breast surgery in this patient cohort.

Main Methods:

  • Prospective observational study involving 70 breast cancer patients.
  • All patients underwent definitive breast surgery and SLNB using subareolar blue dye injection, followed by axillary dissection.
  • Analysis of SLNB identification rate (IR), false negative rate (FNR), sensitivity, negative predictive value (NPV), and accuracy.

Main Results:

  • SLNB identification rate was 92% (64/70), with a median of 2 lymph nodes removed.
  • The false negative rate (FNR) was 11%, with overall SLNB sensitivity of 89%, NPV of 96%, and accuracy of 97%.
  • Residual malignancy was found in 57% of patients with initially clear margins; definitive breast surgery was recommended for all.

Conclusions:

  • SLNB is a feasible procedure for breast cancer patients diagnosed after PHC lumpectomy.
  • Definitive breast surgery is indicated for all patients, irrespective of initial lumpectomy margins, due to high rates of residual disease.
  • Peri-areolar incisions may impact SLNB accuracy, warranting further investigation.