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From the Divisions of Senology (VG, PV, PA, MI, SZ, AV, AL, UV), Nuclear Medicine (CDC), and Pathology (GR), European Institute of Oncology, Milan, Italy; Breast Service (VS), Department of Surgery, Memorial Sloan-Kettering Cancer Center, New York, New York; and Divisione di Chirurgia Generale (RG), Fondazione Salvatore Maugeri, Pavia, Italy.
Correspondence: Address correspondence and reprint requests to: Viviana Galimberti, MD, European Institute of Oncology, Via Ripamonti 435, 20141 Milano, Italy; Fax: 39-02-57489780; E-mail: viviana.galimberti{at}ieo.it
Background: Involvement of the internal mammary chain lymph nodes (IMNs) is associated with worsened prognosis in breast cancer. Use of lymphoscintigraphy to visualize sentinel nodes reveals that IMNs often receive lymph from the area containing the tumor.
Methods: We biopsied IMNs in 182 patients because there was radiouptake to the IMNs or because the tumor was located in the medial portion of the breast. After tumor removal, pectoralis major fibers were divided to expose intercostal muscle. A portion of intercostal muscle adjacent to the sternum was removed. Lymph nodes and surrounding fatty tissue in the intercostal space were freed, removed, and analyzed histologically. The pleural cavity was breached in four cases (2.2%), with spontaneous resolution.
Results: IMNs were found in 160 (88%) of 182 patients; 146 (94.4%) were negative and 14 (8.8%) were positive. The latter received internal mammary chain radiotherapy. The axilla was negative in 4 of 14 cases and positive in 10.
Conclusions: IMNs can be quickly and easily removed via the breast incision with insignificant risk and no increase in postoperative hospitalization. The patients with a positive IMN migrated from N0 (4 cases) or N1 (10 cases) to N3, prompting modification of both local (radiotherapy to internal mammary chain) and systemic treatment; without IMN sampling, they would have been understaged.
Key Words: Breast cancer • Stage migration • Internal mammary chain • Sentinel node biopsy
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