Table 2.

Correlation Between PD-1 and Clinicopathological Characteristics.

Feather	PD-1 Low	PD-1 High	P Value
Total cases
42	21	21	-
Gender
Male	0	0	-
Female	21	21
Age
≤35	5	7	.495
>35	16	14
TNM stage
I	5	3	.694
II	16	18
Differentiation
Well	5	2	.408
Moderate	15	15	1.000
Poorly	1	4	0.341
Herceptin
Yes	8	5	.317
No	13	16
Endocrine therapy
Yes	15	10	.116
No	6	11

Abbreviation: PD-1, programmed cell death protein-1.