Table 2.

The clinicopathological features of breast cancer patients recruited in this study.

Clinicopathlogic feature	Details	n	%
Age at diagnosis	<50	9	42.9
	≥50	12	57.1
	Median	54
	Range	27-65
Disease stage at the point of blood collection	Stage I	0	0
	Stage II	2	9.5
	Stage III	5	23.8
	Stage IV	14	66.7
ER/PR/HER2	ER+ and/or PR+, HER2-	9	42.9
	HER2+	9	42.9
	ER-/PR-/HER2-	3	14.3
CA15.3	≤25.1 U/mL	9	42.9
	>25.1 U/mL	10	47.6
	Not tested	2	9.5
	Median	37.3
	Range	12.4-1341