volatile organic compounds emitted from gastric cancer cell metabolite is separated and detected using hs - spme / gc - ms . a volatile compounds fingerprint atlas - spectrum model are disclosed for early gastric cancer diagnosis / warning volatiles 3 - octanone and 2 - butanone as indicators of gastric cancer cells which are not contained in the headspace of gastric mucosal cells ges - 1 . meanwhile , the ratio of mass to volume to concentration of 4 - isopropoxy alcohol , nonanoic acid , and 4 - butoxy n - butanol is as follows : 4 - isopropoxy alcohol /≦ 0 . 31 ; nonanoic acid /≦ 0 . 36 ; and 4 - butoxy n - butanol /≦ 0 . 40 . the volatile organic compound in cell metabolite to be detected is compared with the fingerprint atlas - spectrum model , so as to implement screening and warning of the early gastric cancer .