Table 1 Correlations^a between clinicopathological features of the primary breast tumor (PT) and presence of CD15⁺, MPO⁺, CD15⁺/MPO⁺ immune cells, or CD15⁺ tumor cells (CD15⁺ TC) in PT.

Clinicopathological features	CD15⁺			MPO⁺			CD15⁺MPO⁺			CD15⁺ TC
	Correlation Coefficient	P value (2-tailed)	N	Correlation Coefficient	P value (2-tailed)	N	Correlation Coefficient	P value (2-tailed)	N	Correlation Coefficient	P value (2-tailed)	N
Age at PT Age at Met NHG Tumor size Nodal stage Breast cancer subtype^b Ki67 Stromal TILs	0.068 0.026 − 0.159 0.004 0.050 − 0.028 − 0.003 0.095	0.492 0.791 0.157 0.969 0.643 0.798 0.975 0.365	104 104 81 98 89 85 100 92	0.015 0.067 0.379 − 0.312 -0.129 0.037 0.206 0.418	0.875 0.476 <0.001* 0.001 0.203 0.723 0.032* <0.001***	114 114 90 108 99 93 109 101	0.052 0.035 0.347 − 0.077 − 0.133 0.075 0.211 0.237	0.585 0.709 <0.001*** 0.431 0.189 0.475 0.027* 0.017*	114 114 90 108 99 93 109 101	0.080 0.033 0.132 − 0.020 0.054 0.034 − 0.073 -0.077	0.397 0.730 0.215 0.835 0.596 0.743 0.451 0.446	114 114 90 108 99 93 109 101

^a Spearman’s 2-tailed test * P < 0.05, ** P < 0.01, *** P < 0.001. NHG = Nottingham Histological grade, PT = primary tumor, Met = Metastasis.
^b Breast cancer subtype was primarily derived from immunohistochemical staining.

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