Table 1. Correlation analysis of different variables between molecular subtypes and Nottingham Prognostic Index (NPI).

		NPI score	Grade	Tumor	Node
Molecular subtypes	r	0.138	−0.212	0.005	−0.026
	P value	0.001	0.000	0.891	0.540
ER	r	0.142	−0.233	0.027	−0.041
	P value	0.001	0.000	0.471	0.330
PR	r	0.139	−0.176	0.056	−0.024
	P value	0.001	0.000	0.132	0.567
HER2	r	0.000	0.063	0.023	0.003
	P value	0.999	0.141	0.553	0.944
Ki67	r	−0.120	0.197	−0.059	−0.012
	P value	0.004	0.000	0.119	0.779