Table 1.

^* Patient and Tumor Characteristics (n = 405)

Characteristics	Number (%)
Age, year	56 (46–66)
Age ≥ 45	319 (78.8)
Female	193 (47.7)
Race
White	307 (75.8)
Black	64 (15.8)
Asian	30 (7.4)
Others	4 (0.9)
Histology
Neoplasm	10 (2.5)
Carcinoma, NOS	385 (95.1)
Adenocarcinoma, NOS	10 (2.5)
Grade
I	39 (9.6)
II	10 (2.5)
III	3 (0.7)
IV	0 (0)
† Unknown	353 (87.2)
LN examined
Yes	114 (28.1)
No	274 (67.7)
Unknown	17 (4.2)
Tumor size, cm	2.8 (1.9–3.8)
Local invasion	60 (14.8)
Metastatic LN	12 (3.0)
Distant metastasis	7 (1.7)
Surgery
None	12 (3.0)
Parathyroidectomy	329 (81.2)
En bloc resection	42 (10.4)
‡ Others	8 (1.9)
Unknown	14 (3.5)

^*Continuous variables are represented as the median followed by interquartile range in the parenthesis. LN, lymph node; NOS, not otherwise specified.

^†Tumor grade was reported in only 52 cases.

^‡Others include debulking surgery and local destruction of tumors.