Prognostic Role of Serum Amino Acids in Head and Neck Cancer

Table 1

Description of the 202 patients included in the analysis.

Parameter		%
Age at diagnosis (mean, sd)	63.0	11.4
Gender
Male	152	75.2
Female	50	24.8
Missing	0	—
Tumor stage
Early	72	35.6
Advanced	130	64.4
Missing	0	—
Tumor subsite
Oral cavity	54	26.7
Oropharynx	31	15.3
Hypopharynx	10	5.0
Larynx	105	52.0
Other	2	1.0
Missing	0	—
Treatment type
Surgery	62	30.7
Chemo or radio	61	30.2
Surgery and radio or chemo	78	38.6
Missing	1	0.5
Smoking status
Never smoker	32	15.8
Former smoker	124	61.4
Current smoker	38	18.8
Missing	8	4.0
Alcohol drinking status
Never drinker	47	23.3
Former drinker	12	5.9
Current drinker	136	67.3
Missing	7	3.5