Table 2.

Five most significant metabolomic biomarkers for lung cancer screening.

	HMDB or MetPA* Number	AUC	P-value (t-test)	P-value (Mann–Whitney U test)
Palmitic acid	HMDB0000220	0.86	5.94E−14	7.81E−16
Heptadecanoic acid	HMDB0002259	0.84	5.28E−12	1.90E−14
4-Oxoproline	METPA0228	0.83	2.65E−10	2.69E−11
Tridecanoic acid	HMDB0000910	0.81	6.95E−13	1.48E−12
Ornithine	HMDB0000214	0.81	4.60E−10	9.74E−12

*MetPA (Metabolomic Pathway Analysis).