Table 1.

Patient Characteristics.

Feather	RFG	RG	P Value
Total cases
42	24	18	-
Gender
Male	0	0	-
Female	24	18	-
Age
≤35	7	5	.921
>35	17	13
TNM stage
I	4	4	.955
II	20	14
Differentiation
Well	4	3	1.000
Moderate	17	13	.921
Poorly	3	2	1.000
Herceptin
Yes	8	5	.700
No	16	13
Endocrine therapy
Yes	15	10	.650
No	9	8
PD-1
Low	16	5	.013*
High	8	13

Abbreviations: PD-1, programmed cell death protein-1; RFG, recurrence-free group; RG, recurrence group.