Table 1.

Baseline patient characteristics. Abbrev. EBV = Ebstein–Barr Virus, N/A: Not Available, TNM = Tumor Node Metastasis, WHO = World Health Organization.

Characteristic		N	%
Age	<65 years	35	76.1
	≥65 years	11	23.9
Sex	Male	36	78.3
	Female	10	21.7
History of tobacco use	Active smoker	14	30.4
	Former smoker	11	23.9
	Nonsmoker	21	45.7
History of alcohol consumption	No	41	89.1
	Moderate/Heavy	5	10.9
Charlson comorbidity index	≤2	16	34.8
	>2	22	47.8
	N/A	8	17.4
Site of metastasis	Lung	10	21.7
	Bone	16	34.8
	Liver	11	23.9
	Other	6	13
	None	17	36.9
Stage TNM	II–III	18	39.1
	IV	24	52.2
	N/A	4	8.7
Histology (WHO classification)	Nonkeratinizing squamous cell carcinoma	40	86.9
	Keratinizing squamous cell carcinoma	3	6.5
	Basaloid	1	2.2
Pretreatment plasma EBV DNA	N/A	2	4.4
	Positive	18	39.1
	Negative	13	28.3
	Unavailable	15	32.6