Table 2.

Tumor Characteristics and Association with Per1 Expression Levels (N = 33).

Characteristic	Low Per1 Levels (≤ 1.60)	High Per1 Levels (> 1.60)	P* (Fisher's Exact Test)
Number of patients [n (%)]	20 (60.6)	13 (39.4)
Age (years) {mean (SD) [minimum, maximum]}	55.2 (11.5) [35.1, 75.1]	55.2 (11.7) [37.5, 69.7]
Menopausal status [n (%)]
Premenopausal	6 (30.0)	4 (30.8)	1.00
Perimenopausal	2 (10.0)	1 (7.7)
Postmenopausal	11 (55.0)	8 (61.5)
Missing	1 (5.0)	0 (0.0)
Maximum size of tumor (cm) [n (%)]
0.5 to < 1.0	0 (0.0)	0 (0.0)	.06
1.0 to < 2.0	2 (10.0)	4 (30.8)
2.0 to < 5.0	17 (85.0)	7 (53.8)
≥ 5.0	0 (0.0)	2 (15.4)
Missing	1 (5.0)	0 (0.0)
ER status
Positive	9 (45.0)	9 (69.2)	.04
Negative	10 (50.0)	2 (15.4)
Equivocal	0 (0.0)	2 (15.4)
Unknown/not determined	0 (0.0)	0 (0.0)
Missing	1 (5.0)	0 (0.0)
Progesterone receptor status
Positive	5 (25.0)	5 (38.5)	.86
Negative	12 (60.0)	7 (53.8)
Equivocal	2 (10.0)	1 (7.7)
Unknown/not determined	0 (0.0)	0 (0.0)
Missing	1 (5.0)	0 (0.0)
Histologic grade
1	1 (5.0)	1 (7.7)	.90
2	6 (30.0)	5 (38.5)
3	9 (45.0)	4 (30.8)
Subtype	1 (5.0)	0 (0.0)
Unknown/not determined	2 (10.0)	3 (23.0)
Missing	1 (5.0)	0 (0.0)
Lymphatic invasion
Yes	5 (25.0)	5 (38.5)	.70
No	14 (70.0)	8 (61.5)
Missing	1 (5.0)	0 (0.0)

^*Without tumors in the missing category.