The Ratio of Positive to Excised Nodes Identifies High-risk Subsets and Reduces Inter-Institutional Differences in Locoregional Recurrence Risk Estimates in Breast Cancer Patients With 1-3 Positive Nodes: An Analysis of Prospective Data From British Colum

In patients with 1-3 N+, evaluating nodal positivity using NR reduced inter-institutional differences in LRR estimates that may exist due to variations in numbers of nodes excised. Nodal ratio >0.20 was associated with LRR >20%, warranting PMRT consideration. Nodal ratio may be useful for extrapolating data from prospective trials to clinical practices in which axillary staging extent vary.