Ki-67 Index Provides Long-Term Survival Information for Early-Stage HER2-Low-Positive Breast Cancer: A Single-Institute Retrospective Analysis

Table 2

Long-term overall survival of HER2-nonamplified primary breast cancer.

Cohorts	Subgroup	8-yearoverall survival (%)	p value
HER2 nonamplified BC	HER2 0	92	0.097
	HER2-low positive	90
HER2 nonamplified BC	Low Ki-67 index	92	0.021
	High Ki-67 index	90
HER2 nonamplified BC	HR positive	92	0.0076
	HR negative	87
HER2 nonamplified BC with HR positive	HER2 0	92	0.11
	HER2-low positive	90
HER2 nonamplified BC with HR negative	HER2 0	88	0.96
	HER2-low positive	87
HER2 nonamplified BC with low Ki-67 index	HER2 0	92	0.90
	HER2-low positive	91
HER2 nonamplified BC with high Ki-67 index	HER2 0	91	0.026
	HER2-low positive	88