A 45-year-old woman has a 2.8 cm invasive ductal carcinoma with clinically negative axillary nodes. Sentinel lymph node biopsy reveals 2 sentinel nodes with isolated tumor cells (ITC) only (< 0.2 mm). According to current guidelines, what is the most appropriate next step?
- A Proceed to axillary lymph node dissection (ALND)
- B Repeat sentinel node biopsy with technetium
- C No further axillary surgery; treat with planned adjuvant therapy ✓
- D Axillary radiotherapy as a substitute for ALND
Correct answer: C. No further axillary surgery; treat with planned adjuvant therapy
Explanation
Isolated tumor cells (ITC) in sentinel nodes, defined as clusters ≤ 0.2 mm or ≤ 200 cells, are classified as pN0(i+) and are not considered nodal metastases for staging. Current NCCN and ASCO guidelines recommend no further axillary surgery for ITC; patients proceed with planned adjuvant systemic and radiation therapy. ALND is not indicated for ITC and carries unnecessary morbidity. This differs from micrometastases (0.2–2 mm, pN1mi) which may also not require ALND in most settings given ACOSOG Z0011 data.
Reference: Bailey & Love's Short Practice of Surgery, 27th ed.
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Written and medically reviewed by the StethoPrep medical team.