Prognostic Role of Serum Amino Acids in Head and Neck Cancer

Table 4

Comparison of amino acid levels among HNC tumor subsites.

Amino acid	value
Alanine	0.452
Alpha-aminobutyric acid	0.116
Aminoadipic acid	0.071
Arginine	0.447
Asparagine	0.699
Beta-alanine	0.663
Beta-aminobutyric acid	0.764
Citrulline	0.474
Ethanolamine	0.026
Gamma-aminobutyric acid	nc
Glycine	0.075
Histidine	0.505
Isoleucine	0.483
4-Hydroxyproline	0.585
Leucine	0.346
Lysine	0.380
Methionine	0.302
1-Methylhistidine	0.300
3-Methylhistidine	0.953
Phenylalanine	0.003
Phosphoethanolamine	nc
Proline	0.698
Sarcosine	0.712
Serine	0.087
Threonine	0.306
Tryptophan	0.066
Tyrosine	0.740
Valine	0.369

^a value obtained from the Kruskal-Wallis test; nc: not computable.