Predictors of distant metastasis in acinic cell carcinoma of the parotid gland

Table 1 Demographics and clinical information, n (%)

Characteristic	Patients with lung metastases (n = 6)	Patients without lung metastases (n = 49)	P value
Age at diagnosis (yr)	57.8	40.2	0.064
Gender
Male	5 (83.3)	21 (42.9)
Female	1 (16.7)	28 (57.1)
Parotidectomy type			0.00013
Superficial	1 (16.7)	39 (79.5)
Total	5 (83.3)	10 (20.4)
Neck dissection	3 (50.0)	7 (14.3)	0.08
Positive margins	1 (16.7)	6 (12.2)	0.77
Gross nerve invasion	6 (100)	0	< 0.0001
Greatest dimension	5.20 cm	2.58 cm	< 0.0001
Initial overall stage
I	0	21 (42.8)
II	0	19 (38.7)
III	0	06 (12.2)
IV	6 (100)	2 (4.1)
Unknown
Initial T-stage
T1	0	24 (48.9)
T2	0	18 (36.7)
T3	0	6 (12.2)
T4	6 (100)	1 (2.0)
Tx	0	0
Initial nodal status
N0	5 (83.3)	47 (95.9)
N1	0	1 (2.0)
N2	1 (16.7)	1 (2.0)
N3	0	0
Nx	0	0
High-grade	3 (50)	1 (2.0)	0.019
Adjuvant XRT	5 (83.3)	14 (28.6)	< 0.001

XRT: X radiotherapy.