Published in:
01-10-2007 | Breast Oncology
Internal Mammary Nodal Chain Drainage Is a Prognostic Indicator in Axillary Node-Positive Breast Cancer
Authors:
Michelle S. Yao, Brenda F. Kurland, Anne H. Smith, Erin K. Schubert, Lisa K. Dunnwald, David R. Byrd, David A. Mankoff, MD, PhD
Published in:
Annals of Surgical Oncology
|
Issue 10/2007
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Abstract
Background
Internal mammary (IM) nodes are a potential site of breast lymphatic drainage. We examined the relationship between lymphoscintigraphic evidence of IM drainage and survival in early-stage breast cancer patients (pts).
Methods
From a prospective database of 855 consecutive sentinel node mapping procedures using peritumoral radiocolloid injection from 1996–2004, we analyzed the 604 cases with stage I–III breast cancer. Overall survival and recurrence-free survival (OS, RFS) rates were compared in pts with (IM+) and without (IM-) IM drainage on lymphoscintigraphy using Kaplan-Meier plots and Cox proportional hazards models. Results: 100 of 604 pts (17%) showed IM drainage. Five-year OS and RFS were 92% vs 88% and 88% vs 85% in IM- vs IM+ pts. In the 186 pts with axillary metastases (node+), 5-year OS and RFS were 91% vs 71% and 84% vs 69% in IM- vs IM+ pts. Univariate analysis of node+ pts estimated increased mortality risk for IM+ (hazard ratio, HR 2.9, P = .04), ≥4 positive nodes (HR 3.2, P = .02), tumors that were ER-negative (HR 3.4, P = .02), or had high Ki-67 (HR 6.8, P = .01). Multivariate analysis estimated similar increased risks [≥4 nodes (HR 4.0, P = .02), IM+ (HR 3.3, P = .06), and ER negativity (HR 2.6, P = .09)].
Conclusions
IM nodal drainage predicted a nearly 3-fold increased mortality risk in node+ pts. Peritumoral radiocolloid injection provides a clinically relevant assessment of IM drainage and should be prospectively tested for its value in tailoring treatment strategies for axillary node-positive pts.