Table 3. Relationship between the primary or occult primary and node metastasis regarding HPV physical status.

			HPV16 Physical Status in Node Metastasis
HPV16 Physical Status in Primary			Integrated	(%)	Mixed	(%)	Episomal	(%)	P Value*
Oropharynx	(N = 18)	Integrated	10	(56)	0	(0)	0	(0)	<0.0001
		Mixed	0	(0)	8	(44)	0	(0)
		Episomal	0	(0)	0	(0)	0	(0)
Occult tonsil	(N = 3)	Integrated	1	(33)	0	(0)	0	(0)	<0.0001
		Mixed	0	(0)	2	(67)	0	(0)
		Episomal	0	(0)	0	(0)	0	(0)

*Symmetry of HPV physical status between the primary tumor and its corresponding node metastasis in oropharyngeal cancer and occult tonsil cancer patients was examined using the kappa test.

HPV: human papillomavirus.