Reoperative sentinel lymph node biopsy after previous mastectomy

Area of Science:

• Oncology
• Surgical Oncology
• Breast Cancer Management

Background:

• Sentinel lymph node (SLN) biopsy is standard for breast cancer axillary staging.
• Clinical scenarios questioning SLN biopsy validity persist, especially after prior mastectomy.
• This study details experience with reoperative-SLN (re-SLN) biopsy post-mastectomy.

Purpose of the Study:

• To evaluate the feasibility and outcomes of reoperative-SLN (re-SLN) biopsy in patients with a history of mastectomy.
• To assess the utility of re-SLN biopsy for axillary staging in recurrent or suspected metastatic breast cancer cases after initial mastectomy.

Main Methods:

• A review of SLN biopsy database from September 1996 to December 2007 identified 20 procedures in patients with prior mastectomy.
• SLN biopsy was performed using radioisotope with or without blue dye, injected superior to the mastectomy incision within the skin flap.
• In 85% of cases (17/20), re-SLN biopsy was conducted due to local or regional recurrence post-mastectomy.

Main Results:

• Re-SLN biopsy was successful in 13 of 20 patients (65%).
• Positive re-SLN results led to completion axillary dissection, confirming additional positive nodes in one patient.
• Unsuccessful biopsies occurred in 7 patients (35%); two of three undergoing axillary dissection had positive nodes.

Conclusions:

• Reoperative-SLN biopsy demonstrated success in a small series of patients after mastectomy.
• This technique may be valuable for axillary staging when indicated following mastectomy.
• Further investigation is warranted to establish the role of re-SLN biopsy in managing breast cancer recurrence.