Table 2. Characteristics of Primary and Secondary Salivary Gland Malignancy.

	Primary Salivary Malignancy		Secondary Salivary Malignancy
	n	%	n	%
Total cases	19,008	-	18	-
Age at diagnosis	59.80 ± 18.361)		53.28 ± 16.634)		P = 0.132
Age group					P = 0.07
< 60 years	8,615	45.3%	12	66.7%
≥ 60 years	10,393	54.7%	6	33.3%
Gender					P < 0.05
Male	10,240	53.9%	2	11.1%
Female	8,768	46.1%	16	88.9%
Race					P = 0.51
White	15,630	82.2%	13	72.2%
Black	1,656	8.7%	2	11.1%
Other	1,486	7.8%	3	16.7%
Unknown	236	1.2%	0	0%
Primary site					P = 0.48
C07.9 - parotid gland	15,134	79.6%	17	94.4%
C08.0 - submandibular gland	2,845	15%	0	0%
C08.1 - sublingual gland	184	1.0%	0	0%
C08.8 - overlapping lesion of major salivary glands	20	0.1%	0	0%
C08.9 - major salivary gland, NOS	825	4.3%	1	5.6%
Grade of salivary cancer					P = 0.08
I - well differentiated	1,733	9.1%	4	22.2%
II - moderately differentiated	3,337	17.5%	5	27.8%
III - poorly differentiated	3,322	17.5%	1	5.6%
IV - undifferentiated	1,487	7.9%	0	0%
Unknown	9,129	48%	8	44.4%