Table 1.

Clinicopathological characteristics of patient cohort.

Characteristics	Discovery (n = 269)		Validation (n = 269)
	Benign (n = 197)	Malignant (n = 72)	Benign (n = 196)	Malignant (n = 73)
Age (years):
Mean	50.41	55.58	50.29	54.63
Median	50.00	55.00	50.00	56.00
Range	30–70	32–70	25–82	40–72
Race:
Chinese	160	64	152	65
non-Chinese	37	8	44	8
Tumor stage:
Stage 0	-	26	-	27
Stage 1	-	26	-	26
Stage 2	-	18	-	16
Stage 3	-	2	-	4
Tumor size:
≤10 mm	-	20	-	20
11 to 20 mm	-	30	-	25
>20 mm	-	24	-	28
Unknown	-	3	-	2
Tumor grade:
Grade 1	-	16	-	18
Grade 2	-	29	-	32
Grade 3	-	23	-	22
Unknown	-	4	-	1
Lymph node status:
Positive	-	51	-	54
Negative	-	17	-	14
Unknown	-	4	-	5