Figure 1. Correlation between estrogen receptor (ER), progesterone receptor (PR), and Ki-67 expression in primary breast tumors and synchronous axillary lymph node metastases. Scatter plot shows breast tumor expression (X-axis) and nodal metastases expression (Y-axis) of ER (A), PR (B) and Ki-67 (C). Strong correlation was observed through Spearman correlation in hormonal receptor and Ki-67 between primary breast tumor and axillary nodal metastases (ER Spearman rho 0.77, p<0.001; PR rho 0.81, p<0.001; and Ki-67 rho 0.72, p<0.001).

ERBT=ER percentage in breast tumor; ERNM=ER percentage in nodal metastases; PRBT=PR percentage in breast tumor; PRNM=PR percentage in nodal metastases; KiBT=Ki-67 percentage in breast tumor; KiNM=Ki-67 percentage in nodal metastases.