TABLE 1.

Patient characteristics.

	HPV+ HNC	HPV− HNC (control)
Total patients	60	17
Sex (M/F)	49/11	15/2
Median age (range)	66 (42–84)
Primary/recurrent	55/5 a	N/A
Plasma available	55/60 patients	17/17 patients
Saliva available	57/60 patients	14/17 patients
Treatment	Chemotherapy and surgery: 42 patients Chemoradiation: 14 patients Other: 4 patients	N/A

^a One patient was additionally sampled for later recurrence following primary disease.