Table 1.

The characteristic peaks of HCC samples

Peak retention time	p value (t test)	Distance (HCC and normal)
2.78	4.11E − 24	0.13126995
2.947	2.01E − 20	0.028912113
6.412	1.04E − 16	0.007838236
6.542	3.70E − 18	0.138559594
6.579	5.98E − 18	0.004900794
6.653	2.57E − 18	0.072035253
6.672	3.11E − 19	0.088778169
6.764	2.60E − 19	0.009222483
7.246	2.06E − 19	0.16321364
7.358	1.71E − 19	0.016046921